HomeMy WebLinkAboutEx_09_Lake_Study
Boeing Apron R Crew Shelters
Standard Lake Study
Submitted to
City of Renton
Renton, Washington
February 2025
Submitted by
WSP USA
1201 Pacific Avenue, Suite 550
Tacoma, Washington 98402
Exhibit 9
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Boeing Apron R Crew Shelters WSP USA
Standard Lake Study February 2025
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TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION ............................................................................................................. 1
2.0 REGULATORY SETTING ................................................................................................. 1
3.0 PROJECT DESCRIPTION ............................................................................................... 2
4.0 STANDARD LAKE STUDY NARRATIVE .......................................................................... 3
4.1 Lake Classification ........................................................................................... 3
4.2 Vegetative Cover ............................................................................................... 3
4.3 Ecological Function .......................................................................................... 4
4.4 Fish and Wildlife ............................................................................................... 4
4.4.1 Mammals ............................................................................................... 4
4.4.2 Birds ....................................................................................................... 4
4.4.3 Amphibians and Reptiles ...................................................................... 5
4.5 Fish .................................................................................................................... 5
5.0 MEASURES TO PROTECT TREES AND VEGETATION ................................................... 5
6.0 NO NET LOSS OF ECOLOGICAL FUNCTION .................................................................. 6
7.0 REFERENCES ................................................................................................................ 7
LIST OF APPENDICES
Appendix A. Photographic Record
Appendix B. Species Lists
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ACRONYMS AND ABBREVIATIONS
Boeing Boeing Company
City City of Renton
DNR Washington Department of Natural Resources
n.d. no date (reference)
RCW Revised Code of Washington
RMC Renton Municipal Code
USACE U.S. Army Corps of Engineers
WAC Washington Administrative Code
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Standard Lake Study February 2025
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1.0 INTRODUCTION
The Boeing Company (Boeing) is proposing to design and install 6 crew shelters and tool
cabanas at Apron R at the Renton, Washington plant. The plant is located at the southernmost
end of Lake Washington between Rainier Avenue North and Interstate 405 within Sections 7 and
8 of Township 23 North, Range 05 East. Apron R is on the south shore of Lake Washington,
north of Buildings 4-41, 4-20, 4-81, 4-82 and 4-83 (Appendix A, Figure 1). Most of Apron R,
which covers 14 acres, was constructed in the early 1940s, with the primary function to transport
completed airplanes from the assembly line to Renton Field, located on the west shore of the
Lower Cedar River, adjacent to the Boeing plant. Current production rates result in
approximately two airplanes that are moved to Renton Field per day. Airplane movement
typically occurs at night. Airplanes are staged on Apron R in designated stalls to undergo
systems checks, to make minor modifications, and/or to temporarily store the airplanes before
they are transported to Renton Field.
Boeing completed resurfacing of Apron R in July 2023. Boeing is in the process of configuring
equipment and facility layout on the apron and is proposing to add crew shelters and portable
tool storage containers (tool cabanas) to facilitate production. This project will add 4 and replace
2 crew shelters, 6 tool cabanas, 1 Disaster Supply tool cabana and relocate 2 tool cabanas to the
apron within 200 feet of Lake Washington. All shelters are prefabricated unit that will be secured
to existing pavement.
The project area is within the regulated shoreline of Lake Washington and therefore, subject to
the regulations of the Shoreline Master Program. Boeing retained WSP to prepare the required
shoreline permit application materials from the City of Renton (City). This report fulfils the lake
assessment narrative requirement of the City of Renton Shoreline Substantial Development
Permit.
2.0 REGULATORY SETTING
The City requires compliance with the State Shoreline Management Act and the City’s Shoreline
Master Program as outlined in Renton Municipal Code (RMC) 4-9-190. To ensure compliance
with the Shoreline Master Program, the City of Renton requires a Shoreline Substantial
Development Permit for all proposed use and development of shorelines that do not qualify for
an exemption pursuant to Revised Code of Washington (RCW) 90.58.140(1) or Washington
Administrative Code (WAC) Chapter 173-27. The proposed project is not exempt.
This report fulfils the requirements of a standard lake study and project narrative as required by
RMC 4-8-120C. This report provides a description of the environmental and habitat attributes of
the project site including the lake classification for the section of Lake Washington adjacent to
the project area; vegetative cover within the project area; ecological functions provided by the
project area; and fish and wildlife species observed or reported in the project area. A site map is
included after the report text.
The project does not include any removal or clearing of trees or vegetation and therefore, does
not include measures to protect trees or vegetation. The project does not include grading and
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Standard Lake Study February 2025
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therefore, no grading plan will be submitted. The project does not have the potential to impact
fish (Chinook salmon, bull trout, steelhead trout) or endangered species habitat and therefore
does not include a biological assessment/critical areas study.
3.0 PROJECT NARRATIVE
Apron R is on the south shore of Lake Washington, north of Buildings 4-41, 4-20, 4-81, 4-82 and
4-83. The Apron R project site is adjacent to the Lake Washington shoreline and within City of
Renton shoreline jurisdiction. The project area is approximately 0.39 acres within the 200-foot
shoreline buffer.
West of the Boeing parcel is a City park, the Cedar River and Renton Municipal Airport.
Commercial properties are to the south and east. Lake Washington is directly north of the Boeing
parcel. The Boeing parcel is zoned Urban Center 2 (UC-2) and is currently used for airport
manufacturing by Boeing. The proposed project will not change the existing use of the project.
No off-site improvements are proposed.
Approximately 1,500 feet of the shoreline along Apron R consists of a pile-supported concrete
deck, concrete bulkhead, sheet-pile bulkhead and riprap bulkhead. Vegetation is limited to
Washington Department of Natural Resources restoration area and a mitigation area that was
planted with native species (see Section 4.2). The site does not contain any wetlands or other
special features. Soils on the site are classified as Urban Land (NRCS n.d). Stormwater drainage
flows away from Lake Washington, into existing inlets which routes flows to the existing
stormwater system.
The proposed development will add 4 and replace 2 crew shelters and add 7 tool cabanas and
relocate 2 tool cabanas to Apron R.
The following is a summary of new and replacement structures:
One new 12-foot by 40-foot crew shelter
One replacement 12-foot by 56-foot (replacing an existing 12’x30’) crew shelter
Three new 10-foot by 30-foot crew shelters
One replacement 10-foot x 30-foot (replacing an existing 8-foot x 20-foot) crew shelter
Six 8-foot by 20-foot tool cabanas
One relocated 10-foot by 10-foot tool cabana
One relocated 10-foot by 20-foot tool cabana
One 8-foot by 10-foot Disaster Supply tool cabana
The crew shelters will be prefabricated wood structures on elevated steel chassis. The tool
cabanas will be repurposed shipping containers constructed of cold-formed steel sitting directly
on the concrete pavement. The crew shelters will be secured to the existing post-installed
mechanical or epoxy anchors into the existing concrete paving.
Exterior lighting is included on the crew shelters. All lighting will be directional and is oriented
away from the lake. A lighting study completed for Boeing indicates that there will be no light
spill onto the lake.
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The project does not include any grading or placement of fill materials. No trees or vegetation
will be removed. The proposed buildings will not alter any views because they are single-story
structures with relatively small footprints. The completed project will be consistent with the
existing structures and industrial use of the site.
The estimated construction cost and estimated fair market value of the proposed project is
$719,801.40.
4.0 STANDARD LAKE STUDY NARRATIVE
This section presents the standard lake study narrative and provides information about existing
habitat conditions and functions of Lake Washington adjacent to the proposed project site.
4.1 LAKE CLASSIFICATION
The City of Renton (COR) Maps categorize the Lake Washington shoreline along the Apron R
project site as Shoreline – High Intensity (City of Renton n.d.). Lake Washington is classified as
a Shoreline of Statewide Significance under Renton Municipal Code (RMC) 4-3-090B.
4.2 VEGETATIVE COVER
A habitat survey of the site was initially conducted by BergerABAM (now WSP) biologists on
October 20, 2016, and on January 25, 2017 to assess habitat conditions and vegetative cover
along the entire length (2,600 feet) of Apron R for the previously completed Apron R
Infrastructure Maintenance and Repair project. WSP biologists conducted a site visit on January
3, 2025 to verify and update the findings of the previous habitat survey. Appendix B provides a
photographic log depicting the habitat conditions and vegetation adjacent to Lake Washington
within the project site as observed during the 2025 site visit.
Habitat conditions and vegetive cover observed during the January 3, 2025 site visit were similar
to the conditions observed during the previous site visit. Most of the Apron R shoreline consists
of a bulkhead that was replaced in 2019 (Appendix B, Photos 1 and 2). The rest of the Apron R
shoreline contains a Washington Department of Natural Resources (DNR) habitat restoration
area which was constructed between 2013 and 2015. The existing shoreline was regraded, and
the existing nearshore substrate was replaced with fine sand, coarse sand, and pea gravel.
Artificial log jams were installed. Invasive plant species were removed and replaced with native
vegetation.
During the 2016 and 2017 site visits, biologists described two vegetated areas at the top of
riprapped embankments that were dominated by invasive species including Himalayan
blackberry (Rubus armeniacus), Japanese knotweed (Polygonum cuspidatum), and English ivy
(Hedera helix). However, during the January 3, 2025 site visit, there were fewer invasive
species, and the composition of native species was higher because additional restoration
plantings were installed in 2023 as mitigation for previously permitted Apron R improvements
(Appendix B, Photos 3 and 4). The species composition was similar to that of the DNR
restoration site and included snowberry (Symphoricarpos albus), and kinnikinnick
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Standard Lake Study February 2025
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(Arctostaphylos uva-ursi). At the time of the site visit, the plantings were healthy and appeared
to be in good condition.
The Washington Natural Heritage Program Data Explorer map shows there are no plant species
of concern in the vicinity of the project site (DNR n.d.).
4.3 ECOLOGICAL FUNCTION
Riparian habitats have important ecological functions in addition to providing habitat for
wildlife. Riparian vegetation protects banks from erosion, contributes to habitat complexity and
provides in-channel aquatic habitat features, maintains favorable water temperature fish through
shading, filters runoff, and provides nutrient input. Riparian vegetation can protect shorelines
against scour during severe storm events. Riparian habitats link upland and aquatic habitats.
Upland habitats have a critical role in watershed function and affect riparian and aquatic habitats,
particularly in drier, low-elevation sites.
Ecological functions along the shoreline of Lake Washington within the project area are limited
because the area is largely unvegetated. Except for the DNR shoreline restoration area and the
additional mitigation planting areas, much of the shoreline along the project site is restricted by a
bulkhead which limits habitat complexity. Where vegetation is present, small shrubs are
dominant and large trees are lacking. The DNR shoreline restoration area and mitigation planting
areas provide some shading and organic matter input to the lake. Additionally, shoreline
vegetation can help to block artificial light sources at night.
4.4 FISH AND WILDLIFE
This section describes fish and wildlife species that have been observed or reported and the
impacts of the proposal on any fish and wildlife identified as potentially occurring in the project
area. Appendix C provides lists of additional mammals, birds and fish species documented
within the Lake Washington basin as described in a previous lake study prepared in 2017 for a
previous Apron R project.
4.4.1 Mammals
No mammals or signs of mammal use were observed during the January 3, 2025 site visit. Given
the level of development in the project area, it is likely that only small mammals such as
squirrels, rats, mice, voles, racoons, opossums and muskrats use the riparian areas along the Lake
Washington shoreline.
4.4.2 Birds
During the site visit, a rufous hummingbird and a few unidentified songbirds were observed
foraging within the riparian planting area adjacent to Apron R. Gulls were observed flying over
the Apron R project area. Apron R is paved and does not provide suitable habitat for birds
though the adjacent riparian vegetation provides habitat for foraging and cover.
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4.4.3 Amphibians and Reptiles
No amphibians or reptiles were observed during the site visit. However, it is likely that
amphibians (e.g. frogs) and reptile species (e.g. turtles) found in the Lake Washington basin may
use habitat within the site vicinity.
4.5 FISH
Lake Washington provides habitat for many fish species including anadromous and non-
anadromous forms of five species of salmonids: Chinook (Oncorhynchus tshawtscha), coho (O.
kisutch), sockeye/kokanee (O. nerka), coastal cutthroat trout (O. clarki clarki), and
steelhead/rainbow trout (O. mykiss). Chinook salmon, steelhead trout, and bull trout are federally
listed under the Endangered Species Act.
Anadromous forms of each of these five salmonid species use the Lake Washington Basin as
migratory, forage, nursery, and spawning habitat. non-anadromous forms spend their entire life
cycle in freshwater. non-anadromous s forms of winter steelhead (rainbow trout), sockeye
(kokanee), and cutthroat trout also occur in Lake Washington. Resident rainbow trout spend their
entire life in the Lake Washington system. Non-anadromous coastal cutthroat trout also occur in
the Lake Washington system and are much more abundant than the anadromous form. Some
offspring from the parents of anadromous sockeye may also remain in Lake Washington for all
or a portion of their lives (resident/anadromous sockeye) (Kerwin, 2001).
Additionally, there have been isolated reports of bull trout (Salvelinus confluentus) occurring in
the Lake Washington system, but population numbers are assumed to be low. Native char,
presumably bull trout, have been observed in the fish ladder viewing pool at the Hiram M.
Chittenden Locks as recently as 1997, while isolated reports of native char being caught in or
around Lake Washington occur every few years. A large juvenile char, again, presumably a bull
trout (~250 millimeter, 3 year old), was caught in the lower Cedar River in July 1998. An adult
char was also caught in the lower Cedar River in April of 1993 (USACE, 2002). Based on this
information, bull trout are not likely to occur in Lake Washington adjacent to the project site.
Species endemic to the Lake Washington system include the northern pike minnow
(Ptychocheilus oregonensis), peamouth (Mylocheilus caurinus), sculpins (Cottus spp.), and
longfin smelt (Spirinchus thaleichthys) (Weitkamp et al., 2000; Wydoski and Whitney, 2003).
Several non-native fish species have been identified in the Lake Washington/Lake Union system
and are listed in Appendix A, Table 3. Some of these species are known to prey on juvenile
salmon (e.g., smallmouth bass) while others are potential competitors with juvenile salmonids
for food (Kerwin, 2001).
5.0 MEASURES TO PROTECT TREES AND VEGETATION
The proposed project does not include removal or clearing of any trees or vegetation. No direct
or indirect impacts to riparian trees or vegetation will occur as a result of the proposed project.
Therefore, no measures to protect trees or vegetation have been incorporated into the work plan.
No mitigation will be required.
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6.0 NO NET LOSS OF ECOLOGICAL FUNCTION
The proposed project meets the criteria of no net loss of ecological functions as described in
RMC 4-3-090D2. The project will result in no net loss of ecological functions in the riparian
zone of Lake Washington adjacent to and within 200 feet upland of the project site. The project
actions occur entirely on the developed surface of the Apron. The project will not alter any
vegetation and will not result in changes to the existing ecological functions provided by the site.
The lighting proposed on the structures will directional and aimed away from the lake. The
riparian zone provides limited ecological function due to low habitat diversity and complexity
that is associated with the existing development of the site.
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7.0 REFERENCES
City of Renton. 2011. City of Renton Shoreline Master Program (Ordinance #5633). City of Renton,
Washington, http://www.ecy.wa.gov/programs/sea/shorelines/smp/pdf/RentonOrdinance.pdf
(accessed May 15, 2017).
City of Renton. 2015. City of Renton Comprehensive Plan. City of Renton, Washington,
http://rentonwa.gov/CompPlan/ (accessed May 15, 2017).
City of Renton. n.d. Planning – Sensitive Area Maps. City of Renton, Renton, Washington,
http://rp.rentonwa.gov/SilverlightPublic/Viewer.html?Viewer=COR-Maps (accessed December 31,
2024).
Kerwin, J. 2001. Salmon and Steelhead Habitat Limiting Factors Report for the Cedar-Sammamish Basin
(Water Resource Inventory Area 8). Washington Conservation Commission, Olympia.
Natural Resources Conservation Service (NRCS). N.d. Web Soil Survey.
https://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx (accessed January 21, 2025).
Richter, K.O., and Azous, A.L. 1997. Amphibian distribution, abundance, and habitat use, in Azous, A.L.,
and Horner, R.R. (eds.), Wetlands and Urbanization – Implications for the Future, Final Report. Puget
Sound Wetlands and Stormwater Management Research Program, Washington State Department of
Ecology, Olympia, King County Water and Land Resources Division, Seattle, Washington, and
University of Washington, Seattle, http://your.kingcounty.gov/dnrp/ library/archive-
documents/wlr/wetlands-urbanization-report/wet-rept.pdf (accessed September 1, 2009).
U.S. Army Corps of Engineers (USACE). 2002. Montlake Cut Slope Stabilization Project Environmental
Assessment Biological Evaluation – Lake Washington Ship Canal, Seattle, Washington. Corps,
Seattle District, Seattle, Washington.
Washington Department of Natural Resources (DNR). N.d. Washington Natural Heritage Data Explorer.
https://experience.arcgis.com/experience/174566100f2a47bebe56db3f0f78b5d9/page/Rare-Plant-and-
Ecosystem-Locations/ (accessed January 6, 2025).
Weitkamp, D.E., Ruggerone, G.T., Sacha, L., Howell, J., and Bachen, B. 2000. Factors Affecting
Chinook Populations – Background Report. City of Seattle, Seattle, Washington.
Wydoski, R.S., and Whitney, R.R. 2003. Inland Fishes of Washington. American Fisheries Society,
Bethesda, Maryland, and University of Washington Press, Seattle.
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FIGURES
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APPENDIX A
PHOTOGRAPHIC RECORD
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Photo 1. The Apron R shoreline showing the bulkhead in the foreground and the DNR
restoration site in the background (the trees left of the building with the flag) (facing East)
Photo 2. A portion of the Apron R bulkhead adjacent to the Lake Washington shoreline (facing
west).
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Photo 3. A portion of the mitigation site adjacent to the DNR restoration site (facing northwest)
Photo 4. Vegetation along the shoreline west of the DNR restoration site (facing east)
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APPENDIX B
SPECIES LISTS
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Table 1. Small Mammals Reported to Occur Along the Lower Cedar River
Common Name Scientific Name
Creeping vole Microtus oregoni
Deer mouse Peromyscus maniculatus
Ermine Mustela ermine
Forest deer mouse Peromyscus oreas
Long-tailed vole Microtus longicaudus
Marsh shrew Sorex bendirei
Masked Shrew Sorex cinereus
Montane Shrew Sorex monticolus
Shrew-mole Neurotrichus gibbsii
Southern red-backed vole Clethryonomys gapperi
Townsend’s chipmunk Tamias townsendii
Trowbridge’s shrew Sorex trowbridgei
Vagrant shrew Sorex vagrans
Source: Richter and Azous, 1997
Table 2. Birds Reported to Occur Along the Lower Cedar River
Common Name Scientific Name Common Name Scientific Name
American crow Corvus brachyrhynchos Northern pygmy owl Glaucidium gnoma
American goldfinch Carduelis tristis
Orange-crowned
warbler
Vermivora celata
American robin Turdus migratorius Pine siskin Carduelis pinus
Black-capped chickadee Parus atricapillus Pacific-slope flycatcher Empidonax difficilis
Belted kingfisher Ceryle alcyon Purple finch Carpodacus purpureus
Bewick’s wren Thryomanes bewickii Red-breasted nuthatch Sitta Canadensis
Brown-headed cow bird Molothrus ater
Red-breasted
sapsucker
Sphyrapicus ruber
Black-headed grossbeak
Pheucticus
melanocephalus
Red crossbill Loxia curvirostra
Brewer’s blackbird
Euphagus
cyanocephalus
Red-eyed vireo Vireo olivaceus
Brown creeper Certhia Americana Rufous-sided towhee Pipilo erythrophthalmus
Black-throated grey warbler Dendroica nigrescens Ruffed grouse Bonasa umbellus
Bushtit Psaltriparus minimus Ruby-crowned kinglet Regulus calendula
Chestnut-backed chickadee Parus rufescens Red-winged blackbird Agelaius phoeniceus
Cedar waxwing Bombycilla cedrorum Sora Porzana Carolina
Cooper’s hawk Accipiter cooperii Song sparrow Melospiza melodia
Common raven Corvus corax Sharp-shinned hawk Accipiter striatus
Common yellow throat Geothlypis trichas Steller’s jay Cyanocitta stelleri
Dark-eyed junco Junco hyemalis Swainson’s thrush Catharus ustulatus
Downy woodpecker Picoides pubescens Townsend’s warbler Setophaga townsendi
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European starling Sturnus vulgaris Vaux’s swift Chaetura vauxi
Evening grosbeak
Coccothraustes
vespertinus
Violet-green swallow Tachycineta thalassina
Fox sparrow Passerella iliaca Virginia rail Rallus limicola
Great blue heron Ardea herodias Warbling vireo Vireo gilvus
Golden-crowned kinglet Regulus satrapa Western tanager Piranga ludoviciana
Hairy woodpecker Picoides villosus Willow flycatcher Empidonax traillii
Hermit thrush Catharus guttatus Wilson’s warbler Cardellina pusilla
Marsh wren Cistothorus palustris Winter wren Troglodytes hiemalis
MacGillivray’s warbler Geothlypis tolmiei Wood duck Aix sponsa
Northern flicker Colaptes auratus Yellow warbler Dendroica petechia
Source: Richter and Azous, 1997
Table 3. Non-Native Fish Species Introduced into the Lake Washington/Lake Union System1
Common Name Scientific Name Status
American shad Alosa sapidissima Uncommon strays
Atlantic salmon Salmo salar Can exceed 1,000 per year
Black bullhead
Ictalurus melas
Extinct
Black crappie Pomoxis nigromaculatus Common
Bluegill
Lepomis macrocheilus
Common
Brook trout
Salvelinus fontinalis
Rarely caught
Brown bullhead
Ictalurus nebulosus
Rare, may be extinct
Brown trout
Salmo trutta
No observed reproduction
Channel catfish
Ictalurus punctatus
Rarely caught
Cherry salmon
Oncorhynchus masou
Extinct
Common carp
Cyprinus carpio
Abundant
Fathead minnow
Pimephales notatus
Unknown
Goldfish
Carassius auratus
Intermittent
Grass carp
Ctenopharengodon idella
Triploids only
Lake trout
Salvelinus namaycush
Extinct
Lake whitefish
Coregonus clupeaformis
Extinct
Largemouth bass
Micropterus salmoides
Common
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Pumpkinseed sunfish
Lepomis gibbosus
Abundant
Smallmouth bass
Micropterus dolomieui
Common
Tench
Tinca
Abundant
Warmouth
Lepomis gulosus
No observed reproduction
Weather loach
Misgurnus angillicaudatus
No observed reproduction
White crappie
Pomoxis annularis
Uncommon
Yellow perch Perca flavescens Abundant
Source: Kerwin, 2001
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