HomeMy WebLinkAboutRS_Ecosystem_Resources_Inventory_180621_v1.pdfECOSYSTEM RESOURCES INVENTORY
EASTSIDE RAIL CORRIDOR REGIONAL TRAIL MASTER PLAN PROJECT
2015-05-12
ii EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
The Eastside Rail Corridor Regional Trail Master Plan Project develops a
baseline inventory and planning guidelines for portions of the Eastside Rail
Corridor owned by King County and Sound Transit.
A variety of uses is possible for the corridor in the future, and various
agencies and jurisdictions have ownership interests in the corridor. This
document is an internal work product supporting a study for future
development of a shared use trail in the corridor.
For more information please visit: Kingcounty.gov/parks/eastsiderailcorridor
Prepared for:
King County Parks, King County Department of Natural Resources and Parks
Prepared by:
Parametrix
ECOSYSTEM RESOURCES INVENTORY iii
CONTENTS
1. INTRODUCTION..........................................................................................................1
1.1 OVERVIEW ........................................................................................................1
1.2 A STRATEGIC CORRIDOR FOR THE EAST SIDE’S
FUTURE................................. ................................................................................2
1.3 THE ERC REGIONAL ADVISORY COUNCIL—A COLLABORATIVE VISION
FOR THE FUTURE OF THE ERC............................ ...............................................2
1.4 PLANNING FOR A TRAIL ALONG THE EASTSIDE RAIL
CORRIDOR........................................................................ ...................................4
2. PLANNING FOR ECOSYSTEM RESOURCES WITHIN THE CORRIDOR................ 4
2.1 INTRODUCTION..............................................................................................4
2.2 STUDY AREA....................................................................................................5
2.3 METHODS........................................................................................................5
2.4 EXISTING CONDITIONS................................................................................. 6
2.5 PRIORITY AREAS FOR CONSERVATION, RESTORATION, AND
MITIGATION......................................................................................................... 8
2.6 REFERENCES..................................................................................................11
FIGURES
FIGURE 1—EASTSIDE RAIL CORRIDOR (ERC) OWNERSHIP ..............................3
TABLES
TABLE 1—STANDARD WETLAND AND STREAM BUFFERS BY JURISDICTION ...6
TABLE 2—POTENTIAL SALMONID SPECIES IN THE RAIL CORRIDOR ...............6
iv EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
WETLAND AND STREAM ATLAS
RENTON
KING COUNTY
BELLEVUE
KIRKLAND
WOODINVILLE
JURISDICTIONAL DITCH ATLAS
ECOSYSTEM RESOURCES INVENTORY
ECOSYSTEM RESOURCES INVENTORY 1
1. INTRODUCTION
1.1 OVERVIEW
“Our Puget Sound region is blessed with
dramatic topography, majestic natural
features, and large, picturesque water
bodies. While adding immensely to the
beauty and quality of life in our region, those
same features also create challenges when
developing transportation, recreation and
utility connections. The Eastside Rail Corridor
(ERC) provides a rare and unique chance to
develop a major north-south corridor for a
variety of important purposes: mobility, utility
infrastructure, and recreation.”
-Excerpt from the Eastside Rail Corridor
Regional Advisory Council report
The Eastside Rail Corridor (ERC) connects
some of King County’s largest and fastest-
growing communities. As part of the
Woodinville Subdivision, a 42-mile rail
corridor that stretches from Renton to
Snohomish, the ERC passes through Renton,
Bellevue, Kirkland, Woodinville, Redmond,
and portions of unincorporated King and
Snohomish counties. Originally a rail line,
known as the Lake Washington Belt Line, that
supported development along the eastern
shore of Lake Washington, the corridor
has been brought into public ownership to
provide a potential route for trail, transit, and
utilities. The ERC Regional Trail Master Plan
(Master Plan) will develop a strategy to build
a non-motorized trail in the corridor without
precluding potential future use for transit
and utilities. Any future transit or utility uses
of the corridor would be considered in
separate planning processes.
The ERC includes approximately 42 miles
of right-of-way. Currently, only a portion
of the ERC is being planned for potential
trail use—a segment of the former railroad
main line between Renton and Woodinville
and a spur line connecting Woodinville
and Redmond. The cities of Kirkland and
Redmond have completed their planning
for a trail in the corridor. The Master Plan
includes the segments of the ERC between
Renton and Kirkland, between Kirkland
and Woodinville, and along the spur from
2 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Woodinville to Redmond. Throughout the
Master Plan, the line between Renton and
Woodinville is referred to as the “main
line,” and the line between Woodinville and
Redmond is referred to as the “spur.” See
Figure 1 for an understanding of the ERC
ownership interests considered in the Master
Plan.
As part of the baseline inventory for the
Master Plan, this study documents the natural
ecosystem values within the King County-
owned and Sound Transit-owned segments,
with a focus on wetlands and streams.
1.2 A STRATEGIC CORRIDOR FOR THE
EAST SIDE’S FUTURE
After nearly a century of rail use, in 2003
Burlington Northern Sante Fe (BNSF) began
conversations with local jurisdictions about
abandoning the rail line. In 2009 a group of
public partners, including King County and
the Port of Seattle, signed a Memorandum
of Understanding that envisioned a regional
approach to preserve the corridor for
multiple uses. Although no specific projects
were in development at that time, the
partners recognized the potential value of
a continuous corridor linking the east side
from north to south as the region continues
to develop. To begin that regional effort,
the Port of Seattle purchased the 42-mile
corridor between Renton and Snohomish.
The southern portion of the line between
Woodinville and Renton was railbanked,
a legal designation that allows certain
uses of the corridor while preserving it for
potential reinstatement of freight rail. The
northern portion, between Woodinville and
Snohomish, remained an active freight area.
The jurisdictions and public agencies
involved in the acquisition of the corridor
envisioned potential future needs for a
non-motorized trail, water distribution,
sewer, power transmission, and transit
in the corridor. Between 2010 and 2013
ownership interests were purchased from
the Port of Seattle by the City of Redmond,
Puget Sound Energy (utility easement), the
City of Kirkland, Sound Transit (primarily
transportation-related easements), and King
County (see Figure 1). These five entities
are now the owners of the corridor between
Renton and Woodinville.
1.3 THE ERC REGIONAL ADVISORY
COUNCIL—A COLLABORATIVE VISION
FOR THE FUTURE OF THE ERC
Recognizing the value of collaboration for
future development of the ERC, the owners
of the corridor formed a Regional Advisory
Council (RAC) as a forum to coordinate
planning for the ERC. The RAC summarized
the findings of their initial planning effort
in the report entitled Creating Connections
– Recommendations on the Eastside Rail
Corridor, which provides a guide for the next
steps in collaboratively planning, developing
and using the ERC. The RAC vision for the
corridor emphasizes its long-term value for
the development of transit, utilities, and a
trail:
“Development of the corridor will enhance
the mobility of our region by creating a
critical north-south transportation corridor
that will allow for multimodal connections,
including high-capacity transit (e.g. heavy
rail, light rail, or other forms of fixed guideway
transportation) and nonmotorized trail use.
The corridor will help us integrate the pieces
of our larger transportation networks. The
corridor will enable key utility improvements
to help meet the demands of a growing
population. The corridor will expand the
recreation network, creating equitable access
for all residents, and benefiting generations of
Puget Sound residents.”
ECOSYSTEM RESOURCES INVENTORY 3
PORT OF SEATTLE
KING COUNTY
CITY OF KIRKLAND
CITY OF REDMOND
SOUND TRANSIT
CORRIDOR OWNERSHIP
Lake WashingtonLake Sammamish520
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UNINCORPORATED
KING COUNTY
UNINCORPORATED
KING COUNTY
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WOODINVILLE
REDMOND
BELLEVUE
NEWCASTLE
RENTON
KIRKLAND
MILE MARKER1
FIGURE 1. EASTSIDE RAIL CORRIDOR (ERC) OWNERSHIPFIGURE 1. EASTSIDE RAIL CORRIDOR (ERC) OWNERSHIP
4 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
1.4 PLANNING FOR A TRAIL ALONG THE
EASTSIDE RAIL CORRIDOR
The Master Plan is focused on implementing
the RAC vision for a non-motorized trail in the
ERC. The ERC represents a critical link in King
County’s Regional Trail System, which includes
a network of shared-use trails connecting
county communities. King County is currently
responsible for over 175 miles of regional trails
throughout the county. These trails include both
paved and soft-surface trails; however, they all
share common features of providing a safe and
enjoyable trail experience for a variety of users.
The ERC provides a rare and unique opportunity
to establish a major new component of the
county’s regional trail system—a component
that provides a significant new north-south trail
corridor, as well as creating the opportunity to
introduce critical connectivity within the county’s
existing regional trail system and trail systems
managed by neighboring communities.
The Master Plan will further several important
goals from the RAC recommendations for the
ERC and the county’s vision for the regional trail
system:
• Advance the understanding of
opportunities and constraints for
development in the corridor
• Engage jurisdictions, agencies, and the
public in a planning process to implement
a trail as part of the corridor’s multi-use
vision
• Connect communities and existing trails
to expand access and connectivity to King
County’s Regional Trail System
Rail corridors are generally heavily modified
landscapes, including extensive embankments,
engineered drainage features, and managed
vegetation. Typically, natural resource features
within rail corridors have also been modified.
Small streams have often been channelized and
culverted, wet areas filled, extensive drainage
ditches installed, and vegetated habitats cleared
and managed. However, these features often still
provide valuable habitat functions, especially
in an urban context. This study documents the
ecological features in the corridor to provide a
basis for the overall planning process.
2. PLANNING FOR ECOSYSTEM
RESOURCES WITHIN THE CORRIDOR
2.1 INTRODUCTION
As part of the baseline inventory for the
Master Plan, this study documents the natural
ecosystem values in the corridor, with a focus
on wetlands and streams. An ecosystem is
defined by the interaction between plants,
animals, microorganisms, and the physical
environment in which they live. Ecosystems
consist of living organisms, including humans,
and the environment they inhabit. Understanding
this relationship is basic to the environmental
review process and the assessment of impacts on
ecosystems. This study addresses the ecosystem
components—wetlands, streams, other potentially
regulated water bodies (i.e. jurisdictional
ditches), and fish and wildlife listed as threatened
or endangered under the Endangered Species
Act (ESA) or by the State of Washington.
This study describes the methods and existing
conditions of the ecosystem resources inventory,
A regional trail is a shared use path
that serves as a component of an
extensive network of off-road, non-
motorized routes connecting all
parts of King County. A regional trail
accommodates a wider variety and
higher volumes of trail users than
local trails typically do. Regional trail
design aims to safely accommodate
non-motorized activities including
walking, jogging, bicycling,
rollerblading, skateboarding, and
other uses.
ECOSYSTEM RESOURCES INVENTORY 5
and provides a summary of priority areas
for conservation and restoration or sites
that may be candidates for compensatory
mitigation (if mitigation is needed) within
the ERC vicinity. This is a planning-level
study, which means that ecological features
were documented through on-site reviews
and mapping in addition to using existing
inventory information from other sources.
However, as a planning-level study,
individual features were not delineated
(which would formally define the extents
of regulated wetland, stream, and ditch
(jurisdictional ditch) features within the
study area), and no systematic evaluation
of ecological functions and values was
completed. Those more intensive studies
would typically be completed to support
more detailed design-level work for projects
that will follow after the completion of the
Master Plan. These features have not been
verified or reviewed by regulatory agencies.
Mapping, photos, and descriptions of natural
features in the corridor are presented in an
atlas attached to this document. Because
critical areas definitions and regulations vary
by local jurisdiction, the atlas generally is
organized by segments within jurisdiction
boundaries. The major features included
in the documentation are wetlands,
streams, and jurisdictional ditches. Many
jurisdictional ditches in the ERC corridor are
features that have been modified to provide
drainage for the original rail line. In some
ways they are “in-between” features that are
man-made and may have little habitat value
in themselves, but play a role in maintaining
the hydrology of the feature they connect
to. Drainage ditches that do not connect
to regulated streams or wetlands are not
regulated, however jurisdictional ditches
are because modifications to these ditches
could have impacts on their connected
streams or wetlands. The jurisdictional
ditches identified within the corridor that
likely have a hydrologic connection to a
regulated waterbody are shown on the maps
following each jurisdiction and listed in the
Jurisdictional Ditch Atlas.
2.2 STUDY AREA
The ERC extends from Renton (mile post
[MP] 5) north to Snohomish (MP 38.25) with
a spur off the main line in Woodinville and
Kirkland. The study area for the Ecosystem
Resources Inventory includes 15.6 miles
of the ERC right-of-way owned by King
County and Sound Transit. Beginning from
the south, this includes the jurisdictions
of Renton, unincorporated King County,
Bellevue, Kirkland, and Woodinville. To
evaluate fish, wildlife, and plant species
listed as threatened or endangered that are
potentially affected by project-related noise
and human activity, the project biologists
also reviewed documented occurrences of
these species within 0.5 mile of the corridor.
2.3 METHODS
This inventory i ncluded a review of existing
information (literature and data sources) and
a field inventory. Biologists reviewed King
County Geographic Information Systems
(GIS) data, Washington Department of Fish
and Wildlife (WDFW) Priority Habitats and
Species (PHS) data, U.S. Fish and Wildlife
Service National Wetland Inventory (NWI)
data, and other existing maps and reports
that encompass ecosystem resources in the
study area. General habitat, presence of
salmonids, barriers to salmonid passage,
water quality, and hydrology for streams in
the corridor were documented as available
from existing reports and data, such as
locally available basin plans. A review of
priority areas for conservation, restoration,
or potential mitigation (if needed) within the
watershed was conducted based on regional
conservation priorities, local basin plans,
and mitigation policies both per King County
and local jurisdictions.
6 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Biologists performed the field inventory during May
through September, 2014 to identify and inventory
wetlands, streams, and jurisdictional ditches by
walking the entire study area. Features observed
in the field were located at a reconnaissance level
using GPS and hand annotating the GIS base map.
Observations were based on the county-owned and
Sound Transit-owned right-of-way and an area within
100 feet of the right-of-way, where not obscured by
vegetation, fencing, or other obstructions. Readily
visible characteristics of wetlands and stream
systems within the corridor were documented.
Observations estimating wetland and stream area,
condition, and general vegetative cover were
recorded, and documented on the GIS base map,
data sheets, and field notebook. Photos of wetlands,
streams, and jurisdictional ditches were taken.
Mapped wetland areas, streams, and rivers are
approximate; wetlands were not delineated or rated
for this level of analysis. For example, soils were not
analyzed for hydric soil indicators or subsurface
hydrology. Because wetlands were not delineated
or rated, the corresponding buffer widths are not
known. Similarly, the ordinary high water mark
(OHWM) for most streams and water types were not
identified for all streams, therefore corresponding
buffer widths are not known. The range of standard
buffers based on critical areas ordinances for
streams and wetlands by jurisdiction are shown in
Table 1. Local jurisdictions may increase or decrease
buffer widths depending on site conditions and
project elements. Buffer widths may also differ if the
wetland or stream is within a Shoreline Management
Area subject to the regulations in the local Shoreline
Master Program.
2.4 EXISTING CONDITIONS
The following sections summarize the conditions
for streams, wetlands, and fish, and wildlife,
and plant species in the study area. Individual
atlas sheets with more specific data for each
of the streams and wetlands are provided.
Atlas sheets were not created for wetlands and
streams mapped by King County or other local
jurisdictions that were not observed in the field,
and wetlands identified outside of the right-
of-way where little to no field data could be
collected. However, these features are displayed
on the maps following each jurisdiction in
addition to those features where field data was
obtained.
2.4.1 Streams
Surface water in the study area discharges to
the following urban stream basins, all of which
are located in Water Resource Inventory Area
(WRIA) 8 (Lake Washington/Cedar/Sammamish
Watershed).
• East Lake Washington (Renton and
Bellevue South)
• May Creek
• Coal Creek
• Mercer Slough
• Sammamish River
• Little Bear Creek
The streams in the study area are generally
affected by the surrounding urban environment,
with all having reaches that are channelized
(i.e. revetments, levees) and/or have been
piped (i.e. corrugated pipes, culverts). In
total, 45 rivers and streams were encountered
TABLE 1 STANDARD WETLAND AND STREAM BUFFERS BY JURISDICTION
Jurisdiction (code citation)Stream Wetland
Renton Municipal Code (RMC 4.3.050)35 to 100 feet 25-100 feet
Bellevue Municipal Code (BMC 20.25H)25 -100 feet 40-225 feet
(wetlands greater than 2,500 square feet)
King County Code (KCC 21A.24)25-115 feet 50-275 feet
Kirkland Zoning Code (KZC Chapter 90)25- 75 feet 25-100 feet
Woodinville Municipal Code
(WMC 21.24)
50-150 feet 50-150 feet
ECOSYSTEM RESOURCES INVENTORY 7
during the field inventory as shown on the
maps that accompany the stream write-ups.
Streams occur in all local jurisdictions—8
in Renton, 2 in unincorporated King County,
11 in Bellevue, 7 in Kirkland, and 17 in
Woodinville. King County watercourse
data is also displayed on the maps, in the
event that these features were not ground-
truthed during the field inventory (i.e.
feature completely piped within right-of-
way). Waterbodies in the corridor listed in
Washington State Department of Ecology
(Ecology’s) Water Quality Assessment 303(d)
list include May Creek for bacteria; and Coal
Creek, Kelsey Creek, and the Sammamish
River—listed for bacteria and dissolved
oxygen.
2.4.2 Wetlands
A total of 83 wetlands were encountered
during the field inventory (performed
May through September, 2014), ranging in
size from less than 0.1 acre to over 7 acres.
Wetlands occur in all local jurisdictions—11
in Renton, 3 in unincorporated King County,
26 in Bellevue, 13 in Kirkland, and 30 in
Woodinville. The wetlands in the study area
are generally narrow and run parallel to the
rail corridor in an adjacent ditch—relics of
dredging along railbed and the manmade
barrier of the rail prism. Several wetlands
are associated with slopes adjacent to the
rail where small drainages or seeps occur,
including a long stretch in Kirkland and
Woodinville between the vicinity of 139th
Avenue NE/Willows Road NE and the vicinity
of 128th Place NE. Some of these wetlands
extend outside of the right-of-way where
the boundary was estimated using aerial
imagery. Many wetlands have been partially
filled or modified in some manner, and
contain non-native or invasive species but
may provide habitat to urbanized wildlife.
2.4.3 Fish, Wildlife, and Plant Species
Fish Species. Salmonid species have been
documented or modeled for eight of the
project area streams through review of
SalmonScape, WDFW’s interactive, computer
mapping system (WDFW 2014), and the City
of Bellevue’s individual fish use descriptions
for Coal Creek, Kelsey Creek, and Sturtevant
Creek (City of Bellevue 2009). Table 2
describes the potential salmonid species
TABLE 2. POTENTIAL SALMONID SPECIES IN THE RAIL CORRIDOR
Stream Name Local Jurisdiction Drainage Basin Potential Salmonid Species in the Rail
Corridor
May Creek Renton May Creek Sockeye salmon, Chinook salmon steelhead
trout, coho salmon
Coal Creek Bellevue Coal Creek (Cedar)Cutthroat trout, sockeye salmon, Chinook
salmon, steelhead trout, coho salmon
Kelsey Creek Bellevue Mercer Slough Cutthroat trout, sockeye salmon, Chinook
salmon, steelhead trout, coho salmon
Sturtevant Creek Bellevue Mercer Slough Sockeye salmon*, Chinook salmon*,
steelhead trout*, coho salmon*
SW15 Kirkland Sammamish River Sockeye salmon, Chinook salmon*, steelhead
trout, coho salmon*
SW16 Kirkland Sammamish River Sockeye salmon, Chinook salmon*, steelhead
trout, coho salmon*
SW17 Kirkland Sammamish River Sockeye salmon*, Chinook salmon*,
steelhead trout*, coho salmon*
Sammamish River Woodinville Sammamish River Sockeye salmon, Chinook salmon, steelhead
trout, coho salmon, bull trout, kokanee
*Modeled presence only. WDFW defines “modeled presence” as “habitat upstream of known species presence, but downstream of
any known natural barrier. The modeled category does not factor habitat quality, flow or any other natural or human-caused condition
that would otherwise prevent habitat use.”
8 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
that could occur within the rail corridor by
jurisdiction.
Terrestrial Wildlife Species. No terrestrial
ESA-listed species or state-listed threatened
or endangered terrestrial species are known
or expected to occur in the study area.
Within 0.5 mile of the project corridor, the
WDFW Priority Habitat program identifies
the occurrence of a purple martin (Progne
subis) breeding area west of the rail in the
vicinity of the confluence of May Creek and
Lake Washington. Purple martins are a state
candidate species. Although not mapped
within 0.5 mile of the corridor, several other
state-listed sensitive species and candidate
species may use habitats in the project area.
State listed sensitive species that could be in
the project corridor include the bald eagle
(Haliaeetus leucocephalus) and peregrine
falcon (Falco peregrinus). Candidate species
that could be in the project corridor include
the Townsend’s big eared bat (Corynorhinus
townsendii), western toad (Anaxyrus boreas),
pileated woodpecker (Dryocopus pileatus),
vaux swift (Chaetura vauxi), and purple
martin. – The recently listed Oregon spotted
frog (Rana pretiosa) is known to occur in
Washington only at large wetland complexes
in Klickitat, Skamania, Thurston, Skagit,
and Whatcom counties. Oregon spotted
frogs depend on relatively large areas with
perennial bodies of water and associated
wetlands. No such habitat is present in the
action area. The nearest location where
Oregon spotted frog critical habitat has been
proposed for designation is greater than 50
miles from the project corridor.
2.4.4 Jurisdictional Ditches
A total of 29 jurisdictional ditches were
identified in the ERC right-of-way. Most of
these ditches run parallel to the rail and
connect to either a stream or wetland. Potential
jurisdictional ditches are shown on the aerial
maps following each jurisdiction, and a table
listing potential connectivity with regulated
wetlands or waterbodies is in the Jurisdictional
Ditch Atlas.
2.5 PRIORITY AREAS FOR
CONSERVATION, RESTORATION, AND
MITIGATION
Priority areas for conservation and restoration
were identified within the watershed based on
a review of regional conservation priorities and
local basin plans. Candidate sites for potential
mitigation (if needed) were also identified
considering mitigation policies both per King
County and local jurisdictions.
When permitted projects create unavoidable
impacts to the environment, project sponsors
must offset, or “mitigate” the environmental
impacts associated with the project. The
mitigation process includes avoiding and
minimizing impacts as much as possible,
and then making up for any unavoidable
impacts through compensatory mitigation.
Compensatory mitigation can occur on-site
(at or near the place where the impact project
occurs) or off-site. The mitigation sequencing
requirements are established by National
Environmental Policy Act (NEPA), the Clean
Water Act (CWA), and local critical areas
ordinances. According to NEPA (40 Code of
Federal Regulations [CFR] paragraphs 1508.20),
the sequence of mitigation is as follows:
• Avoiding the impact altogether by not
taking a certain action or parts of an
action
• Minimizing impacts by limiting the
degree or magnitude of the action and its
implementation
• Rectifying the impact by repairing,
rehabilitating, or restoring the affected
environment
• Reducing or eliminating the impact over
time by preservation and maintenance
operations during the life of the action
• Compensating for the impact by replacing
or providing substitute resources or
environments
ECOSYSTEM RESOURCES INVENTORY 9
If compensatory mitigation is needed for the ERC,
it would be implemented in accordance with
applicable federal, state, and local requirements
and guidelines. Where feasible, potential
project-specific conservation and compensatory
mitigation sites would be selected according
to the federal Final Compensatory Mitigation
Rule issued in April 2008 by the U.S. Army Corps
of Engineers (Corps) and U.S. Environmental
Protection Agency (EPA) (40 CFR Part 230).
According to the Final Compensatory Mitigation
Rule, the federal hierarchy for wetland mitigation
options generally provides a preference for
mitigation bank credits, when the permitted
activity is in the service area of an approved bank
with the appropriate types of credits available.
In the absence of an approved bank, in-lieu
fee programs are preferred over permittee-
responsible mitigation (i.e., project-specific
mitigation developed by King County).
If project-specific wetland mitigation were
developed by King County for the ERC, then site
selection would follow local jurisdiction critical
area ordinances, the joint guidance developed
by Ecology, the Corps, and the EPA (Hruby et
al. 2009), which discusses the implementation
of a watershed approach to selecting mitigation
sites, and appropriate current available agency
regulations. Using a watershed approach allows
for a greater degree of flexibility in selecting
mitigation sites and potentially greater value
created for the watershed than the previous
regulatory focus on on-site mitigation.
The following section describes sites to consider
as priority areas for conservation or potential
mitigation based on a review of regional
conservation priorities, local basin plans, and
mitigation policies both per King County and
local jurisdictions, and the relationship of the rail
corridor’s position in the watershed.
2.5.1 Streams
The primary focus for stream conservation,
restoration, and potential mitigation should be
on those streams with documented fish use and those
with potential fish habitat. Upon review of existing
documents that specify restoration and enhancement
opportunities (e.g., basin plans and shoreline master
programs), three streams emerged at the top for
consideration.
May Creek. There is the potential to apply
prescribed enhancement and restoration identified in
the 2001 May Creek Basin Action Plan (King County
and City of Renton 2001), including stabilizing
slopes prone to erosion, placement of large woody
debris (LWD), and enhancing riparian vegetation by
planting conifers in the project vicinity. There may
also be opportunities to create floodplain wetlands
and increase connectivity to wetlands in the vicinity.
Kelsey Creek. Actions in the project area could
include riparian vegetation enhancement and stream
channel restoration including removal of pilings
from OHWM, if trestle replacement or removal
occurs. Other potential actions in the project vicinity
could include those identified by the Final Lake
Washington/Cedar/Sammamish Watershed (WRIA 8)
Chinook Salmon Conservation Plan (WRIA 8 Steering
Committee and Forum 2005) such as improving
connections to nearby wetlands and cold water
seeps, restoring channel (e.g., remove riprap and
install LWD), enhancing riparian vegetation, and
modifying existing culverts that are partial barriers.
Sammamish River. Actions in the project area
could include riparian vegetation enhancement
and stream channel restoration such as removal of
pilings from OHWM, if trestle replacement or removal
occurs. Other potential actions in the project vicinity
could include those identified by the Final WRIA 8
Chinook Salmon Conservation Plan (WRIA 8 Steering
Committee and Forum 2005) such as restoring
the floodplain and re-grading channel to increase
meanders.
Many of the smaller stream crossings under the rail,
especially those with potential fish habitat, could
be replaced to establish better connectivity and
reduce velocity. Additionally, most project area
stream buffers would benefit from enhancement.
10 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Lake Washington is also in the project vicinity in
the Renton segment. The restoration plan in the
Renton Shoreline Master Program suggests some
opportunities may be present on short sections of
shoreline along the railroad right-of-way. Although
most of the lakeshore is densely developed with
residences, some opportunities could include
enhancing the shoreline at WR2, at Kennydale Park,
or the May Creek delta.
2.5.2 Wetlands
Many of the project area wetlands and associated
buffers are disturbed or vegetated with invasive
species and would benefit from enhancement.
However, three wetland areas were identified as
top candidates for conservation, restoration, and
potential mitigation.
WB21. Because of the importance of this wetland
as a headwater of the west tributary of Kelsey
Creek, there is opportunity for wetland restoration
and enhancement and buffer enhancement.
WB25/WB26. Because the wetlands are adjacent
to Kelsey Creek and are in a degraded condition
with invasive species cover, the wetlands are
good candidates for wetland restoration and
enhancement and buffer enhancement. The Final
WRIA 8 Chinook Salmon Conservation Plan (WRIA
8 Steering Committee and Forum 2005) identifies
improving connections to nearby wetlands and
enhancing riparian vegetation in the project
vicinity.
WW18. There is an opportunity for wetland
creation and enhancement. A berm could be
removed to create additional wetland and
other portions of the wetland and buffer could
be enhanced. This wetland is in the Little Bear
Creek Watershed, which has restoration projects
identified in the Final WRIA 8 Chinook Salmon
Conservation Plan (WRIA 8 Steering Committee
and Forum 2005). Although this wetland is
outside of the area currently railbanked for trail
development, it may be an appropriate location
to consider for potential mitigation of impacts
associated with the project.
2.5.3 Buffers
Buffers are important for protecting wetlands
from indirect impacts because many aquatic
resources and ecological functions are sensitive
to disturbances (changes) in adjacent upland
areas that result in changes to the biological,
chemical, and hydrological properties of the
wetland (Castelle et al. 1994). Riparian buffers are
important to the health of streams and the fish that
inhabit the streams. Properly functioning riparian
buffers provide stream shading and a source of
LWD, contribute organic debris to the stream,
stabilize stream banks, reduce fine sediment input
into streams, filter nutrients and pollutants, and
reduce and detain flood waters. Land use affects
all buffer functions and effectiveness directly and
indirectly. Since many wetlands and streams are
situated near developed areas, it is important
to preserve remaining buffers and employ
enhancement measures where feasible. Most
wetland buffers and stream buffers in the project
area would result in functional lift if enhancement
were implemented. Generally, enhancement
could include planting native trees, shrubs, and/or
emergent species to increase vegetation structure
and diversity.
2.5.4 Habitat Connectivity for Wildlife
Connectivity of aquatic areas (wetlands, streams,
and lakes) to uplands and other aquatic areas is
important for the movement of wildlife from one
habitat to another. Habitat connectivity depends
greatly on the adjacent land use and amount of
development. An ERC right-of-way containing an
undeveloped buffer or edge running parallel to
the trail can help maintain a vital habitat corridor
in this urbanized area, if it is well-vegetated with
native species and has minimal disturbance.
ECOSYSTEM RESOURCES INVENTORY 11
2.6 REFERENCES
City of Bellevue. 2009. Fish Use of Stream
Drainage Basins in the City of Bellevue,
April 2009. Individual descriptions for the
following streams: Coal Creek, Kelsey Creek,
Sturtevant Creek, April 2009.
Castelle, A. J., A. W. Johnson, and C. Conolly. 1994.
Wetland and Stream Buffer Size Requirements
– A Review. Journal of Environmental Quality
23:878 882.
Hruby, T., K. Harper, and S. Stanley. 2009.
Selecting Wetland Mitigation Sites Using
a Watershed Approach. Washington State
Department of Ecology Publication #09-06-
032. Olympia, WA.
King County and City of Renton. 2001. Final
Adopted May Creek Basin Action Plan, April
2001.
WDFW (Washington Department of Fish and
Wildlife). 2014. Washington Department of
Fish and Wildlife’s SalmonScape queried
in October 2014 at the following website:
http://apps.wdfw.wa.gov/salmonscape/
WRIA 8 Steering Committee and Forum. 2005.
Final Lake Washington/Cedar/Sammamish
Watershed (WRIA 8) Chinook Salmon
Conservation Plan, July 2005.
12 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Page Intentionally Left Blank
WETLAND AND STREAM
ATLAS
ECOSYSTEM RESOURCES INVENTORY 13
A detailed atlas of wetland, and streams in the corridor right-of-way is included on the following sheets. The
atlas includes wetland and stream descriptions, photographs, followed by aerial maps showing the estimated
wetland and stream extents inside and near the corridor right-of-way. The first page of this section is a sheet
index for all jurisdictions the corridor crosses. Individual sheet indexes are also provided by jurisdiction
followed by detailed wetland and stream descriptions and the aerial maps.
MASTER MAP INDEX: Page 14
RENTON
Map Index: Page 16
Wetlands: Pages 17 – 27
Streams: Pages 28 – 35
Maps: Pages 36 – 41
KING COUNTY
Map Index: Page 44
Wetlands: Pages 45 – 47
Streams: Pages 48 – 49
Maps: Pages 50 – 51
BELLEVUE
Map Index: Page 54
Wetlands: Pages 55 – 80
Streams: Pages 81 – 91
Maps: Pages 92 – 109
KIRKLAND
Map Index: Page 112
Wetlands: Pages 113 – 125
Streams: Pages 126 – 133
Maps: Pages 134 – 147
WOODINVILLE
Map Index: Page 150
Wetlands: Pages 151 – 180
Streams: Pages 181 – 196
Maps: Pages 198 – 219
Atlas Table of Contents
BELLEVUE
KIRKLAND
REDMOND
RENTON
WOODINVILLE
Lake
Sammamish
Lake
Washington
5
90
405
104
908
522
520
900
167
527
513
202
599
Woodinville Main Line
Maps: W1-W15
Pages: 198-219
Kirkland Main Line
Maps: K1-K9
Pages: 134-147
Bellevue Main Line
Maps: B1-B18
Pages: 92-109
King County Main Line
Maps: KC1-KC2
Pages: 50-51
Renton Main Line
Maps: R1-R6
Pages: 36-41
Main Line
Main Line
Main Line
Main Line
Spur
Master Map Index Rail Corridor - Study Area
Rail Corridor - Outside Study Area
0 1 20.5 Miles
14 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
RENTON
ekaLnotgnihsaW
Map: R6
Wetlands: WR11
Water Features: SR6, SR7
Map: R5
Wetlands: WR9, WR10
Map: R4
Wetlands: WR7, WR8
Water Features: May Creek
Map: R3
Wetlands: WR5, WR6, WR7
Water Features: SR4, SR5, JDR2Map: R2
Wetlands: WR2, WR3, WR4
Water Features: SR2, SR3
Map: R1
Wetlands: WR1
Water Features: SR1, JDR1
Bellevue
Newcastle
Renton
Mercer
Island
King
County
King County
Lake
Washington
Cedar RiverM a y C r e e k112thPl
S
E
NE 30th St
N 40th St
LoganAveNN E 4 4 t h St
N 8th StIslandCrestWayNE P a rk D r
SE 8 8 t h P lLincolnAveNESE 68th St
84thAveSEN 6th St
SE 88th StSE70thPl
SE 72nd St
NE 27th St
N 30th St
SE89thPl
W
M
erc
er
Wa
y
87thAveSParkAveNMonroeAveNENE 12th St
84thAveSNewcastle Way
116thAveSEEM ercerWayLake Washi
ngt
on Bl
vd NSunsetBlvdNE124t
hAveSE112thAveSEGar
denAveNBurnettAveNEdmondsAveNE900167
405
Bellevue
Kirkland
Newcastle
Redmond
Renton
Woodinville
Renton Main Line
Inventor ied Waters and Wetlands
Map Index
*King County Hydrographic Data
Main Line
Rail Corridor - Study Area
Rail Corridor - Outside Study Area
Watercourse *
Inventoried Waters and Wetlands Map Extent
16 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
ECOSYSTEM RESOURCES INVENTORY 17
Segment: Main Line
Jurisdiction: Renton
Map Number: R1
DATE OF SITE VISIT: 05/22/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—RENTON
USFWS CLASS: PSS/PEM
HGM CLASS: SLOPE/DEPRESSIONAL/RIVERINE
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 1.0 / 1.0
WETLAND NAME: WR1
WR1—SOUTH END LOOKING SOUTHEAST
DESCRIPTION: WR1 is a large, linear wetland associated with a stream (SR1) that extends along the western perimeter
of the wetland, east of the railbed. Hydrologic sources supporting WR1 include surface water as well as groundwater and
seeps expressed off an adjacent slope. Stream SR1 flows in a ditch through the wetland. SR1 serves as an unconstrained
inlet and outlet to the wetland and, although not detected, there is likely an underground pipe associated with Lake
Washington Boulevard North that serves as an additional inlet. Observed indicators of hydrology included inundation,
saturation, drainage patterns, water-stained leaves, and algae. The shrub community is dominated by salmonberry
(Rubus spectabilis), Pacific ninebark (Physocarpus capitatus), and climbing nightshade (Solanum dulcamara). The emergent
community is dominated by reed canarygrass (Phalaris arundinacea) and giant horsetail (Equisetum telmateia) with
watercress (Nasturtium officinale) and common duckweed (Lemna minor) growing within the stream. The buffer consists
of a deciduous forest to the north, a row of conifers to the west, quarry spalls, and a wall interspersed with Himalayan
blackberry (Rubus armeniacus) to the south, and a roadway to the east.
WR1—LOOKING NORTH, NEAR MOUNTAIN VIEW
AVENUE CROSSING
18 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R2
DATE OF SITE VISIT: 05/22/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—RENTON
USFWS CLASS: PSS/PEM
HGM CLASS: SLOPE/LACUSTRINE
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 0.1 / 0.1
WETLAND NAME: WR2
WR2—FACING WEST OUT OF STUDY AREA
DESCRIPTION: WR2 is a small, lacustrine/slope wetland directly adjacent to Lake Washington. Hydrologic sources
supporting WR2 include Lake Washington and a pipe under the railroad and roadway (Lake Washington Boulevard North).
The hydrologic outlet is Lake Washington. Observed indicators of hydrology include hydrophytic vegetation and the
resonance of water entering the wetland area through a pipe. The scrub-shrub community is dominated by Himalayan
blackberry (Rubus armeniacus) and Pacific ninebark (Physocarpus capitatus), and the emergent community is dominated
by giant horsetail (Equisetum telmateia) and creeping buttercup (Ranunculus repens). The buffer consists of a yard with
deciduous trees to the north, a yard with deciduous trees to the south, a shrub community dominated by Himalayan
blackberry on a slope as a buffer to the railbed to the east, and Lake Washington to the west.
WR2—FACING NORTHWEST OUT OF STUDY AREA
ECOSYSTEM RESOURCES INVENTORY 19
Segment: Main Line
Jurisdiction: Renton
Map Number: R2
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—RENTON
USFWS CLASS: PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): <0.1 / <0.1
WETLAND NAME: WR3
WR3—SOUTH END FACING NORTH
DESCRIPTION: WR3 is a small, linear depression located east of the railbed associated with a maintained railside
ditch. The primary hydrologic sources supporting WR3 include groundwater and precipitation. WR3 does not have a
visible inlet or outlet. Observed indicators of hydrology include water-stained leaves, cracked soils, and hydrophytic
vegetation. The emergent community is dominated by unidentified grasses, common rush (Juncus effusus), and giant
horsetail (Equisetum telmateia) with the majority of the wetland area consisting of bare ground. To the north, south,
and east, the buffer primarily consists of several deciduous trees (bigleaf maple [Acer macrophyllum]), shrubs (beaked
hazelnut [Corylus cornuta]), Himalayan blackberry (Rubus armeniacus), and salal (Gaultheria shallon), grasses, and forbs.
The buffer to the east also includes Lake Washington Boulevard North. To the west, the buffer consists of the railbed
followed by a narrow corridor of black cottonwood (Populus balsamifera), bigleaf maple, butterfly bush (Buddleia davidii),
and Himalayan blackberry with some Scotch broom (Cytisus scoparius) and English holly (Ilex aquifolium). A house, yard,
and Kennydale Beach Park are situated farther west from the narrow forested corridor.
WR3—NORTH END FACING SOUTH
20 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R2
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—RENTON
USFWS CLASS: PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): <0.1 / <0.1
WETLAND NAME: WR4
WR4—SOUTH END FACING NORTH
DESCRIPTION: WR4 is a linear, depression located east of the railbed, west of the intersection of N 36th Street,
Burnett Avenue N, and Lake Washington Boulevard North. The wetland is associated with a railside ditch. The primary
hydrologic sources supporting WR4 are groundwater and precipitation. No inlet was detected. The outlet is located
at the north end of the wetland where it naturally connects to Stream SR3. Observed indicators of hydrology include
small areas of inundation, saturated soil, and exposed and cracked soils. The emergent community is dominated by
an unidentified grass and giant horsetail (Equisetum telmateia) with some creeping bentgrass (Agrostis stolonifera) and
common velvet grass (Holcus lanatus). To the north the buffer consists of a stream (SR3) and Himalayan blackberry
(Rubus armeniacus), and to the south, the buffer consists of quarry spall, grasses, and steps to Kennydale Beach Park. To
the east, the buffer consists of grasses and forbs and Lake Washington Boulevard North; to the west is the railbed (no
vegetation between wetland and the railbed), the park, and residential development.
WR4—NORTH END FACING SOUTH
ECOSYSTEM RESOURCES INVENTORY 21
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—RENTON
USFWS CLASS: PEM/PFO/PSS
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 0.2 / 0.2
WETLAND NAME: WR5
WR5—SOUTHERN 1/4 SECTION FACING NORTH
DESCRIPTION: WR5 is a long, linear depression located east of the railbed south of N 40th Street. The wetland is
associated with a railside ditch. The primary hydrologic sources supporting WR5 include groundwater, precipitation,
and local surface water runoff. No inlets were observed. The outlet consists of a pipe (and catch basin) that flows
under the railbed. Observed indicators of hydrology include small areas of inundation, saturated soil, drainage patterns
in the wetland, water-stained leaves, and algae. The forested community is dominated by black cottonwood (Populus
balsamifera). The shrub community is dominated by birch (Betula sp.), red alder (Alnus rubra), common rush (Juncus
effusus), and broad-leaf cattail (Typha latifolia) with overhanging Himalayan blackberry (Rubus armeniacus). The emergent
community is dominated by common rush and broad-leaf cattail. To the north, south, and east the buffer is dominated
by Himalayan blackberry with some trees including bigleaf maple (Acer macrophyllum), Scouler’s willow (Salix scouleriana),
and red alder. To the west the buffer includes the railbed and landscaped areas with a mix of shrubs and trees.
WR5—NORTHERN 1/4 SECTION FACING NORTHEAST
22 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: MAY CREEK
USFWS CLASS: PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): <0.1 / <0.1
WETLAND NAME: WR6
WR6—SOUTH END FACING NORTH
DESCRIPTION: WR6 is a small depressional wetland in maintained lawn located west of the railbed and the
intersection of Lake Washington Boulevard and N 40th Street. Hydrologic sources supporting WR6 include groundwater
and occasional surface water from an adjacent stream (SR5) that is piped under the railbed and daylights south of the
wetland. The outlet for the wetland is SR5 and there is no evidence of an inlet. Observed indicators of hydrology include
small pockets of inundation and saturation within the upper 12 inches of soil. The emergent community is dominated by
lawn and creeping buttercup (Ranunculus repens) with the common occurrence of bird’s foot trefoil (Lotus corniculatus),
some sawbeak sedge (Carex stipata), and small-fruited bulrush (Scirpus microcarpus). Two patches of yellow flag iris (Iris
pseudacorus) were observed in two patches. The buffer consists primarily of landscaped lawn, paved areas, and the
railbed (to the east) with a row of western red cedar (Thuja plicata) to the northeast and a row of deciduous trees to the
south.
WR6—NORTH END FACING SOUTH
ECOSYSTEM RESOURCES INVENTORY 23
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: MAY CREEK
USFWS CLASS: PFO/PSS
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 0.2 / 0.2
WETLAND NAME: WR7
WR7—NORTH END FACING SOUTH
DESCRIPTION: WR7 is a small, depressional wetland in a vegetated strip between Wells Avenue N and Lake
Washington Boulevard North. The primary hydrologic source supporting WR7 is groundwater. No inlet was observed. The
outlet is a pipe in the northwest corner of the wetland that extends under Wells Avenue N and likely under N 41st Street
Place. Water from the wetland was observed flowing north in a drainage path into the pipe at the time of the field visit.
Indicators of hydrology include inundation and saturation within the upper 12 inches of soil. Snags were observed in the
wetland. The forested community is dominated by red alder (Alnus rubra) and reed canarygrass (Phalaris arundinacea). The
shrub community is dominated by red alder (saplings) and reed canarygrass. Himalayan blackberry (Rubus armeniacus)
was common throughout. Common duckweed (Lemna minor) was present in the drainage path along the west side of
the wetland. The buffer includes roadways to the north and west, the railroad to the east, and a disturbed area to the
south with a narrow strip of vegetated buffer consisting of red alder, Himalayan blackberry (Rubus armeniacus), and
reed canarygrass. A mix of more desirable native vegetation including black cottonwood (Populus balsamifera), Pacific
madrone (Arbutus menziesii), and Douglas-fir (Pseudotsuga menziesii) with an understory of invasive shrubs are located
east of the railbed.
WR7—SOUTH END FACING NORTH
24 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: MAY CREEK
USFWS CLASS: PFO/PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): <0.1 / <0.1
WETLAND NAME: WR8
WR8—SOUTH END FACING NORTH
DESCRIPTION: WR8 is a small, depressional wetland east of the railbed, north of Wells Avenue N and N 41st Street,
and south of May Creek. Hydrologic sources supporting WR8 include groundwater, precipitation, and local runoff. No
inlets or outlets were detected. Observed indicators of hydrology included drainage patterns, water-stained leaves,
and cracked soil in the wetland. The forested community is dominated by black cottonwood (Populus balsamifera) with a
sparse understory of mostly bare ground and some common rush (Juncus effusus). The emergent class consists primarily
of reed canarygrass (Phalaris arundinacea) and common rush. The buffer is minimal and includes maintained vegetation,
roadway, and railbed. Just to the north of the wetland is a patch of Japanese knotweed (Polygonum cuspidatum).
WR8—NORTH END LOOKING SOUTH
ECOSYSTEM RESOURCES INVENTORY 25
Segment: Main Line
Jurisdiction: Renton
Map Number: R5
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—BELLEVUE SOUTH
USFWS CLASS: PFO/PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 0.2 / 0.2
WETLAND NAME: WR9
WR9—SOUTH END FACING NORTH FROM THE RAIL
DESCRIPTION: WR9 is a long, linear depressional wetland associated with the railside ditch. It is located on the
west side of the railbed, east of the Virginia Mason Athletic Center (VMAC), and south of Seahawks Way. Hydrologic
sources supporting WR9 include groundwater, surface water, precipitation, and local runoff. A constrained inlet (pipe)
was observed under the railbed near the south end of the VMAC building. A pipe under Seahawks Way conveys water
from Wetland WR10. A constrained outlet (pipe) was observed in the northwest corner at the south end of the VMAC.
Observed indicators of hydrology in the wetland include inundation, saturation, drainage patterns, and slight buttressing
of trees. The forested community is dominated by black cottonwood (Populus balsamifera) with a sparse understory
consisting mostly of bare ground. The emergent community is primarily reed canarygrass (Phalaris arundinacea) and giant
horsetail (Equisetum telmateia). The buffer is minimal and disturbed. It includes disturbed vegetation to the north, the
railbed to the east, the maintenance facility to the west, and a gravel road to the south (associated with the Seahawks
facility).
WR9—CULVERTS AT NORTH END FACING SOUTH
26 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R5
DATE OF SITE VISIT: 06/10/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—BELLEVUE SOUTH
USFWS CLASS: PEM
HGM CLASS: DEPRESSIONAL
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): <0.1 / <0.1
WETLAND NAME: WR10
WR10—SOUTH END FACING NORTH
DESCRIPTION: WR10 is a small, linear depressional wetland associated with the railside ditch. It is located west of the
railbed and adjacent to Virginia Mason Athletic Center (VMAC), northwest of Hazelwood Lane, and north of Seahawks
Way. Hydrologic sources supporting WR10 include groundwater and local surface water runoff. The outlet is a pipe at
the southwest end of the wetland, which extends under Seahawks Way to WR9. No inlets were detected. Observed
indicators of hydrology include hydrophytic vegetation and water-stained leaves. The dominant emergent community is
broad-leaf cattail (Typha latifolia) with some common rush (Juncus effusus). The existing vegetated buffer includes a nar-
row landscaped area (mulched, minimal trees and shrubs) between the wetland and a paved parking lot to the west, and
an area of giant horsetail (Equisetum telmateia) growing in quarry spalls between the railroad and the wetland to the east.
Seahawks Way, the railroad, and Hazelwood Way comprise the rest of the buffer.
WR10—NORTH END FACING SOUTH
ECOSYSTEM RESOURCES INVENTORY 27
Segment: Main Line
Jurisdiction: Renton
Map Number: R6
DATE OF SITE VISIT: 06/10/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON—BELLEVUE SOUTH
USFWS CLASS: PFO
HGM CLASS: DEPRESSIONAL/RIVERINE
ESTIMATED WETLAND SIZE IN ACRES (TOTAL / WITHIN CORRIDOR RIGHT-OF-WAY): 0.2 / 0.2
WETLAND NAME: WR11
WR11—SOUTH END FACING NORTH
DESCRIPTION: WR11 is a linear depressional/riverine wetland located on both sides of the railbed with a trestle
crossing over it, north of the Virginia Mason Athletic Center (VMAC). Hydrologic sources supporting WR11 includes
groundwater and surface water runoff from adjacent streams (SR6 and SR7). Streams SR6 and SR7 function as both
inlets and outlets to the wetland. Observed indicators of hydrology include small pockets of inundation, saturation,
and stream flow. The dominant forested community is red alder (Alnus rubra), reed canarygrass (Phalaris arundinacea),
and giant horsetail (Equisetum telmateia). The buffer consists of the railbed, residential development, and landscaping to
the west; a roadway to the east and to the north; and a parking area to the south. Immediately adjacent to the wetland
is a thin strip of vegetation consisting of Himalayan blackberry (Rubus armeniacus), giant horsetail, black cottonwood
(Populus balsamifera), and landscaped plants.
WR11—VIEW TO THE SOUTH UNDER TRESTLE
28 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R4
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: MAY CREEK
STREAM NAME: May Creek
DESCRIPTION: May Creek intersects the rail north of the intersection of Wells Avenue N and Lake Washington Boulevard
North. May Creek, a tributary to Lake Washington, drains the area north of the Cedar River and west of Issaquah Creek.
Within the rail right-of-way, the rail extends over the stream on a bridge. Bridge footings were observed below the ordinary
high water mark (OHWM). The OHWM was determined at the time of the site visit and is shown on Map R4. Additional
stream crossings near the rail include Lake Washington Boulevard North and a sewer main between Lake Washington
Boulevard North and the rail. In-stream features include a concrete weir, large woody debris, and gravel and cobble
substrate. Riparian vegetation in the right-of-way includes sparse red alder (Alnus rubra), Himalayan blackberry (Rubus
armeniacus), giant horsetail (Equisetum telmateia), Japanese knotweed (Polygonum cuspidatum) and a variety of grasses. A snag
was also observed in the buffer.
The City of Renton classifies the water type of May Creek as Shoreline (Class 1). The Washington Department of Fish and
Wildlife’s SalmonScape (queried October 2014) indicates the “documented” presence of sockeye salmon (O. nerka), Chinook
salmon (O. tshawytscha) (fall Chinook), steelhead trout (O. mykiss) (winter run), and coho salmon (O. kisutch). King County
adopted a basin action plan in 2001 to reduce flooding, stabilize stream banks, reduce erosion, protect and enhance fish and
wildlife habitat, and improve water quality. The action plan and other studies performed since that time are located on the
County website: http://www.kingcounty.gov/environment/watersheds/cedar-river-lake-wa/may-creek.aspx.
There is the potential to apply prescribed enhancement and restoration identified in the 2001 May Creek Basin Action Plan
including stabilizing slopes prone to erosion, placement of large woody debris (LWD), and enhancing riparian vegetation by
planting conifers in the project vicinity. There may also be opportunities to create floodplain wetlands and increase connec-
tivity to wetlands in the vicinity.
MAY CREEK—EAST OF RAIL BRIDGE, LOOKING UP-
STREAM AT ROAD BRIDGE
MAY CREEK—EAST OF RAIL BRIDGE LOOKING
DOWNSTREAM FROM UNDER ROAD BRIDGE
ECOSYSTEM RESOURCES INVENTORY 29
Segment: Main Line
Jurisdiction: Renton
Map Number: R1
DATE OF SITE VISIT: 05/22/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - RENTON
STREAM NAME: SR1
DESCRIPTION: Stream SR1 enters the corridor in the vicinity of the Mountain View Avenue N/N 33rd Street
intersection, then flows south along the east side of the railbed with Wetland WR1 for approximately 0.26 mile before
entering a pipe that crosses under the railbed. A jurisdictional ditch flows (JDR1) flows north into Stream SR1 in the
pipe on the east side prior to flowing under the railbed. It then discharges over an engineered erosion control feature
(terraced quarry spalls) before it flows west under Mountain View Avenue N. Stream SR1 is considered a primary source
of hydrology to Wetland WR1. During the site visit, flow was visible in the lower segment until just north of Wetland WR1,
where the stream transitioned to intermittent. The bankfull width is approximately 4 to 5 feet east of the railbed. The
stream has in-stream vegetation in portions including watercress (Nasturtium officinale) and common duckweed (Lemna
minor). Riparian vegetation is narrow consisting of deciduous forest to the north, a row of conifers and English ivy (Hedera
helix) to the west, Himalayan blackberry (Rubus armeniacus), interspersed with quarry spalls, and a wall to the south.
Developed areas in the buffer include the railbed, roadways, and residences.
SR1—WEST SIDE, LOOKING UPSTREAM TOWARDS MT.
VIEW AVENUE
SR1—EAST SIDE, LOOKING UPSTREAM (NORTH) FROM
CULVERT UNDER RAILBED
30 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R2
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - RENTON
STREAM NAME: SR2
DESCRIPTION: Stream SR2 is located in the vicinity of Kennydale Beach Park, emerging from a pipe under Lake
Washington Boulevard North approximately 75 feet south of the intersection of Lake Washington Boulevard North,
Burnett Avenue N, and N 36th Street. The stream flows north along the east side of the railbed, then turns west through
the pipe under the railbed. The pipe extending under the rail is broken as evidenced by water flowing under the pipe at
the outlet, rather than in it. On the west side of the rail, Stream SR2 briefly daylights in a broken concrete-lined ditch
before entering another pipe that extends under concrete and sand in Kennydale Beach Park then discharging to Lake
Washington. Stream SR2 was flowing at the time of the field investigation. The stream width is approximately 4 feet and
has a variable substrate with gravel, sand, and silt. Vegetation in the channel and banks includes watercress (Nasturtium
officinale), common rush (Juncus effusus), giant horsetail (Equisetum telmateia), American speedwell (Veronica americana),
and a variety of grasses. Riparian vegetation is limited to giant horsetail, Himalayan blackberry (Rubus armeniacus), and
maintained disturbance-tolerant herbaceous species. Developed areas in the buffer include the railbed, roadways, and
residences.
SR2—LOOKING EAST AT CULVERT SR2—LOOKING NORTH FROM SOUTH END
ECOSYSTEM RESOURCES INVENTORY 31
Segment: Main Line
Jurisdiction: Renton
Map Number: R2
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - RENTON
STREAM NAME: SR3
DESCRIPTION: Stream SR3 is located in the vicinity of Kennydale Beach Park, emerging from a pipe under Lake
Washington Boulevard North, approximately 50 feet north of the intersection of Lake Washington Boulevard North,
Burnett Avenue N, and N 36th Street. The stream briefly daylights for several feet on the east side of the railbed where
water from Wetland WR4 flows into Stream SR3. The stream then flows through a pipe under the railbed and the rest
of the right-of-way. Although not field verified, it is assumed it ultimately discharges to Lake Washington. Stream SR3
was flowing at the time of the site visit. The stream is lined with quarry spalls. Vegetation in the riparian buffer includes
Himalayan blackberry (Rubus armeniacus), giant horsetail (Equisetum telmateia), and other disturbance-tolerant herbaceous
vegetation.
SR3—LOOKING EAST AT DAYLIGHTED SEGMENT AND
PIPE UNDER LAKE WASHINGTON BOULEVARD NORTH
32 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - RENTON
STREAM NAME: SR4
DESCRIPTION: Approximately 60 feet south of N 38th Street, Stream SR4 emerges from a pipe under Lake Washington
Boulevard North flowing west, and enters a pipe that extends under the railbed where it likely continues as a piped
system that ultimately discharges to Lake Washington. The grade of the daylighted portion of the stream east of the rail
is approximately 10 percent. In addition to a substrate consisting of cobble, gravel, and sand, broken pieces of concrete
and pipe were in the channel. Erosion and scour were observed at the outlet of the Lake Washington Boulevard North
pipe. Stream SR4 was flowing at the time of the site visit. Vegetation in the riparian buffer includes Himalayan blackberry
(Rubus armeniacus), giant horsetail (Equisetum telmateia), butterfly bush (Buddleia davidii), climbing nightshade (Solanum
dulcamara), and other invasive and disturbance-tolerant vegetation.
SR4—FROM PIPE UNDER RAILBED, LOOKING NORTH-
EAST (UPSTREAM)
SR4—LOOKING AT SCOUR POOL BY ROADWAY PIPE
OUTLET
ECOSYSTEM RESOURCES INVENTORY 33
Segment: Main Line
Jurisdiction: Renton
Map Number: R3
DATE OF SITE VISIT: 05/23/2014
DRAINAGE BASIN: MAY CREEK
STREAM NAME: SR5
DESCRIPTION: In the railbed right-of-way, Stream SR5 is piped east of, and under, the railbed with daylighted channel
west of the railbed just north of the intersection of Lake Washington Boulevard North and N 40th Street. It is associated
with Wetland WR6. A catch basin and associated pipes east of the rail (near the northern extent of Wetland WR5) likely
provide the hydrology to both the Stream SR 5 and Wetland WR6. Stream SR5 leaves the right-of-way in a pipe that
extends under Wells Avenue N. It is assumed that it eventually drains to Lake Washington. The low-gradient, narrow
(approximately 18 inches in width) channel was flowing at the time of the site visit. The stream flows through a landscaped/
maintained area with buffer vegetation of maintained lawn, creeping buttercup (Ranunculus repens), reed canarygrass
(Phalaris arundinacea), installed trees, and a garden.
SR5—LOOKING WEST
34 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Segment: Main Line
Jurisdiction: Renton
Map Number: R6
DATE OF SITE VISIT: 06/10/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - BELLEVUE SOUTH
STREAM NAME: SR6
DESCRIPTION: Stream SR6 flows north along the east side of Seahawks Way/Ripley Lane N and extends under Ripley
Lane N, north of the Seahawk Training Facility (Virginia Mason Athletic Center) north entrance. It continues to flow north
on the east side of the railbed through and adjacent to Wetland WR11 into Stream SR7, immediately south of the Ripley
Lane N crossing (trestle). Stream SR6 was flowing at the time of the visit. The width varies between 4 feet (downstream)
and 8 feet (upstream), becoming more incised at the north end. The segment of Stream SR6 that flows under the
rail trestle through Wetland WR11 is braided. Vegetation in the riparian buffer includes red alder (Alnus rubra), black
cottonwood (Populus balsamifera), reed canarygrass (Phalaris arundinacea), giant horsetail (Equisetum telmateia), Himalayan
blackberry (Rubus armeniacus), and landscaped plants. The developed portion of the buffer consists of the railbed,
residential development, roadways, and a parking area.
SR6—LOOKING NORTH (PRIMARY CHANNEL)SR6/WR11—BRAIDED SECONDARY CHANNELS
ECOSYSTEM RESOURCES INVENTORY 35
Segment: Main Line
Jurisdiction: Renton
Map Number: R6
DATE OF SITE VISIT: 06/10/2014
DRAINAGE BASIN: EAST LAKE WASHINGTON - BELLEVUE SOUTH
STREAM NAME: SR7
DESCRIPTION: Stream SR7 emerges from a culvert that extends under Ripley Lane N near the north end of Wetland
WR11 and the Ripley Lane N crossing (trestle). It flows west under the rail trestle, extends under a private drive, and
daylights again for approximately 100 feet before discharging to Lake Washington. West of the rail trestle, Stream SR6
discharges to Stream SR7. At the time of the visit, Stream SR7 was flowing. The stream width varies between 3 and 4 feet.
Vegetation in the riparian buffer includes red alder (Alnus rubra), black cottonwood (Populus balsamifera), reed canarygrass
(Phalaris arundinacea), giant horsetail (Equisetum telmateia), Himalayan blackberry (Rubus armeniacus), and landscaped
plants. The developed portion of the buffer consists of the railbed, residential development, roadways, and a parking area.
SR7—LOOKING UPSTREAM (EAST) AT CULVERT UNDER
RIPLEY LANE
SR7 (AND SR6)—CROSSING AND CONFLUENCE UNDER TRESTLE, LOOKING
WEST (DOWNSTREAM) WITH SR6 JOINING SR7 FROM LEFT SIDE
Lake
Washington
JDR1
SR1
WR1
R
e
n
to
n
Renton King CountyK
in
g
C
o
u
n
ty
10
08
0
6
0
4
0
2
0 1008060402012010080064020604
0202
0 BURNETTAVENN 33RD ST
N 32ND ST
N 31ST ST
N 30TH ST
N 29TH ST
N 28TH PLMOUNTAINVIEWAVENMOUNTAINVIEWAVENLAKEWA
S
H
I
N
G
T
O
N
B
LV
D
NLAKEWASHINGTONBLVDN
Bellevue Newcastle
Renton
Wetland Feature(s): WR1
Water Feature(s): SR1, JDR1
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventor ied Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 100 15025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R1
36 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Lake
Washington
SR3
SR2
WR3
WR4
WR2RentonKing County806040204020Kennydale
Beach Park
BURNETTAVENLAKE WASHINGTON BLVD NN 36TH ST
N 35TH ST
N 34TH ST
Bellevue Newcastle
Renton
Wetland Feature(s): WR2, WR3, WR4
Water Feature(s): SR2, SR3
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventor ied Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 10025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R2
ECOSYSTEM RESOURCES INVENTORY 37
Lake
Washington MayCreekJDR2
SR5
SR4
6
WR5
WR6
WR7
RentonKingCounty120100806040140100806040201204080604020602020
LAKE WASHINGTON BLVD NWELLSAVENN 40
TH PL
N 40TH ST
N 37TH ST
N 37TH ST
N 38TH ST
Bellevue Newcastle
Renton
Wetland Feature(s): WR5, WR6, WR7
Water Feature(s): SR4, SR5, JDR2
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventoried Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 100 15025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R3
38 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
May Creek
M ayCreek6
WR7
WR8
80604060
40
WELLSAVENN 4 1 S T P L
LAKEWASHINGTONBLVDNBellevue Newcastle
Renton
Wetland Feature(s): WR7, WR8
Water Feature(s): May Creek
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventoried Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 10025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R4
ECOSYSTEM RESOURCES INVENTORY 39
Lake
Washington
WR9
WR10
R entonK ing C ounty40204 0 LAKEWASHINGTONBLVDNESEAH
AWKS WAY
N E 44 T H S TRAMPHAZELWOOD LNRAM P405
Bellevue Newcastle
Renton
Wetland Feature(s): WR9, WR10
Water Feature(s):
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventoried Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 100 15025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R5
40 EASTSIDE RAIL CORRIDOR - REGIONAL TRAIL MASTER PLAN PROJECT
Lake
Washington
SR7
SR6
WR11 NewcastleRenton60
4
0
604020RIPLEY LN SERIPLEY LN NRIPLEY LN N405
Bellevue Newcastle
Renton
Wetland Feature(s): WR11
Water Feature(s): SR6, SR7
Wetland (GPS Boundary)
Wetland (Estimated Boundary)
Stream* (GPS)
Stream* (Estimated)
Pipe*
Jurisdictional Ditch
OHWM (GPS)
Pipe End
County Land
City Limit
Public Land
Park
Parcel
Mile Marker
Rail Corridor
Watercourse **
Wetland***
Wetland****
Inventoried Waters and Wetlands
Eastside Rail Corridor
Regional Trail Master Plan Project
0 50 10025
Feet
* Arrow indicates flow direction ** King County Hydrographic Data
*** National Wetlands Inventory **** City of Renton Wetlands Inventory
Renton Main Line
Map R6
ECOSYSTEM RESOURCES INVENTORY 41
Page Intentionally Left Blank
EASTSIDE RAIL CORRIDOR REGIONAL TRAIL MASTER PLAN PROJECT
KING COUNTY DEPARTMENT OF NATURAL RESOURCES AND PARKS
WWW.KINGCOUNTY.GOV/PARKS/EASTSIDERAILCORRIDOR
ERCTRAIL@KINGCOUNTY.GOV
PARAMETRIX
PRR
TOOLE DESIGN GROUP
ESA
ICICLE CREEK ENGINEERS
UNIVERSAL FIELD SERVICES
THE LAW OFFICE OF CHARLES MONTANGE