HomeMy WebLinkAboutC_On_Hold_Letter_220617_v2_w_enclosures
June 17, 2022
Lori Obeyesekere
Hensley Lamkin Rachel, Inc.
14881 Quorum Rd
Dallas, TX 75254
SUBJECT: "On Hold" Notice
Kennydale Gateway / LUA22-000011, SA-M, SA-H, SSDP, ECF, MOD
Dear Ms. Obeyesekere,
The Planning Division of the City of Renton accepted the above master application for review on January
13, 2022. Staff has determined that secondary review of the Transportation Impact Analysis – Revised
and the Response to City Comments about Transportation will be necessary (attached). The traffic study
review services fee must be paid prior to authorizing Transpo Group to begin their review.
At this time, your project has been placed “on hold” for secondary review. Please contact me at (425)
430-7289 if you have any questions.
Sincerely,
Clark H. Close
Principal Planner
Enclosure(s): Transportation Impact Analysis – Revised, dated June 14, 2021; Response to City Comments about Transportation,
dated March 3, 2022
cc: Kennydale Gateway LLC / Owner(s)
L. Baker, T. Baker, Battin, Brown, Fleming, Frisvold, Gunn, Henderson, Jones, Krupp, Long, Lower, McIvor, Miller, Natha, Nugent,
Olson, Reymann, Servais, Slick, Smith, Thorp, Vira, Duwamish Tribe, Department of Ecology / Parties of Record
| 1
TECHNICAL MEMORANDUM
Project: Kennydale Gateway
4350 Lake Washington Boulevard N, Renton, WA
Subject: Transportation Impact Analysis – REVISED
Date: June 14, 2021
Author: Marni Heffron, P.E., P.T.O.E.
This memorandum presents the transportation analysis for the Kennydale Gateway project located at 4350 Lake Washington Boulevard N in Renton, WA. This analysis was performed to be consistent with the City of Renton’s Traffic Impact Analysis Policy Guidelines for New Development.1 It includes a project description, estimate of project-generated trips, analysis of future traffic conditions in the site vicinity, and assessment of potential mitigation. This memorandum has been revised for the current development proposal and supersedes the analysis of this project dated September 9, 2019.2 As described in detail below, the project site is adjacent to the Interstate 405 (I-405) / NE 44th Street interchange, where the Washington State Department of Transportation (WSDOT) and Sound Transit will be constructing major improvements. WSDOT has performed extensive analysis of the interchange
and nearby intersections and evaluated future 2025 and 2045 conditions. These future conditions had assumed more intensive development of the project site than is now contemplated. This transportation analysis presents trip generation estimates for the proposed development, and compares that to WSDOT’s analysis assumptions. Information about planned improvements is also provided. Per guidance from the City of Renton,3 intersections beyond the interchange area were not studied.
1. Introduction and Project Description
The 7.7-acre project site is bounded by Lake Washington Boulevard N on the west and north and I-405 and the southbound on-ramp to the east. The south edge of the site is a wooded public access corridor along the May Creek Trail.
The project proposes to develop three four-story residential buildings with a total of up to 390 apartment units (the current site plan includes 375 units, but the higher number was used as a worst-cast for this analysis) and parking for about 400 vehicles—about half in surface lots and about half in structure on
the first levels of the three buildings. One of the buildings (Building 1) would also include a 1,500 square foot ground-floor (sf) commercial retail space near the development’s entrance on Lake Washington Boulevard N. It is noted that the previous analysis of this site in September 2019 assumed
that Sound Transit would construct a 200-space park-and-ride lot at the north end of the site. The park-and-ride lot is now proposed to be constructed elsewhere, likely on the east side of I-405. The site plan is shown on Figure 1.
1 Provided by M. Herrera – City of Renton, October 8, 2020. 2 Heffron Transportation, Inc., Kennydale Gateway Transportation Analysis, September 9, 2019. 3 Pre-application meeting, February 2019.
RECEIVED
Clark Close 12/17/2021
PLANNING DIVISION
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 2
Figure 1. Kennydale Gateway Site Plan
Source: HLR Architects, June 10, 2021.
2. Future Transportation Improvements
WSDOT is planning major improvements as part of the I-405, Tukwila to I-90 Vicinity Express Toll
Lanes Project (Tukwila to I-90 Project). In general, WSDOT’s project proposes to add one lane to I-405 in each direction for about nine miles beginning near State Route (SR) 167 and continuing approximately one mile north of Interstate 90 (I-90). The project would also add a general purpose
(auxiliary) lane to southbound I-405 between milepost (MP) 6.7 (north of N 30th Street) and MP 7.1 (south of NE 44th Street) and from MP 9.4 (north of 112th Avenue SE) to MP 10.5 (north of Coal Creek Parkway). The existing high-occupancy vehicle (HOV) lane on I-405 and the additional auxiliary lane
would be operated as a two-lane express toll lane system.4 4 WSDOT, Transportation Discipline Report: I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project (MP 0.0 to 11.9) and Downtown Bellevue Vicinity Express Toll Lanes Project (MP 11.9 to 14.6), July 2018.
N
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 3
WSDOT also proposes to rebuild the I-405 / NE 44th Street interchange. The current plan proposes to relocate NE 44th Street / Lake Washington Boulevard N to pass under I-405. On the west side of I-405,
regrading would begin at about N 43rd Street, and the grade of the street at Seahawk’s Way would be lowered by about 7 feet compared to the current overpass condition. In addition, Sound Transit plans to locate a new Bus Rapid Transit station at the interchange, which would be accessed via HOV-only ramps from the center lanes of I-405. Figure 2 shows a concept of the interchange, which includes the following features:
• The northbound ramps, southbound ramps, and direct HOV ramps would be controlled by roundabouts where they intersect Lake Washington Boulevard N and NE 44th Street. WSDOT’s
Transportation Discipline Report for the corridor evaluated these three intersections,
• The WSDOT analysis also contemplated that the intersection at the Lake Washington Boulevard N / N 43rd Street intersection, at which a new east leg would serve as the Site access for the Kennydale Gateway project, would be controlled with a roundabout that would be built by others. The proposed project proposes to construct this roundabout.
• The intersection at Lake Washington Boulevard N / Seahawks Way would be reconfigured to prohibit all left turn movements. Turns from Seahawks Way would be stop-sign controlled. Prohibited movements would proceed to adjacent roundabouts to reverse direction.5 It is noted that WSDOT had originally assumed that the site would have a secondary access connecting to the south leg of the Seahawks Way intersection. However, that access is not proposed by the project.
Figure 2. Concept Plan for Future I-405 / NE 44th Street Interchange
Source: WSDOT and Flatiron Lane, July 2020. Sound Transit is helping to fund some of the improvements along the I-405 corridor and at the NE 44th Street interchange to support its voter-approved Bus Rapid Transit (BRT) corridor, known as Stride. The S1 line between Burien and Bellevue is currently anticipated to begin operating in 2024.6 The improvements include the 44th Street Station and a 200-space park-and-ride lot near the interchange.
WSDOT’s plan and analysis of the interchange had assumed that the 200-space park-and-ride lot would be constructed at the Kennydale Gateway site, but Sound Transit is now proposing that the park-and-ride be located elsewhere, likely on the east side of I-405.
Because the WSDOT and Sound Transit improvements are funded, all analyses herein reflect their completion for future conditions. No analysis of the existing roadway system was performed.
5 Based on geometric and traffic control assumptions in WSDOT’s Synchro model for this intersection, HNTB, filename: 2025Build.AM.syn, October 2016. 6 Sound Transit website: https://www.soundtransit.org/system-expansion/i-405-brt, accessed April 6, 2021.
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 4
3. Site Trip Generation
Trip generation for the Kennydale Gateway project was estimated using rates published in the Institute of Transportation Engineers’ (ITE) Trip Generation Manual7 and adjusted to reflect potential non-vehicular modes of travel and internal trips among the uses. The following describes the assumptions for each of the land uses.
• Apartments – Trips were derived using equations published for Multifamily Housing (Mid-Rise)
(Land Use 221), which is appropriate for the proposed four-story residential component. It is assumed that 20% of the commute trips could be made using the planned Stride BRT service on I-405, and planned non-motorized station connections to the site. This percentage is consistent with US Census Bureau mode-of-travel surveys for residents living near the site.8 These data showed that in 2010, about 84% of all resident trips were made by vehicle (70% by single-occupant vehicle and 13.7% by carpool). Transit trips accounted for 7.2% of the resident trips. With the future BRT system, it is likely that transit use will increase. Therefore, the 80% of the trips assumed to occur by vehicle is a reasonable assumption.
• Commercial Retail – The small retail space on the site (about 1,500 sf) could accommodate different types of uses ranging from take-out food services, a coffee shop, and/or other convenience services. Trips were estimated using the averages of rates for a Coffee/Donut Shop without Drive-through Window (Land Use 936), Fast Food Restaurant without Drive-Through Window (Land Use 933), and Shopping Center (Land Use 820) land uses contained in the Trip Generation Manual. Many customers of the commercial use(s) are expected to live in the adjacent apartments and make “internal” trips within the site. Those “internal” trips would not add to the site driveways or adjacent roadways. The highest percentage of internal use is expected to occur
in the morning, if a coffee shop is located in the commercial space. The resulting trip reductions range from 50% in the PM peak hour to 75% in the AM peak hour.
The trip rates and internal-trip percentage assumptions for the site are listed in Table 1.
7 ITE, 10th Edition, September 2017. 8 U.S. Census Bureau, American Community Survey, compiled by Puget Sound Regional Council, 2014. Data reviewed for Transportation Analysis Zones (TAZ) 323 (where site is located) and TAZ 310 located to the north.
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 5
Table 1. Trip Generation Rates, Equations, and Vehicle Trip Adjustments
Land Use / Definition Trip Generation Rates and Equations 1 Trip Reduction for Transit or Internal Trips
Multifamily Housing (Mid-rise) (ITE Land Use Code 221) – Includes apartments, townhouses, and condominiums located with the same building with at least three other dwelling units and that have between three and 10 levels (floors). Equations for a “General Urban/Suburban” setting were used.
Daily T = 5.45(X) – 1.75 (50% in, 50% out) 20% (transit)
AM Peak Hour of Adjacent Street Ln(T) = 0.98 Ln(X) – 0.98 (26% in, 74% out) 20% (transit)
PM Peak Hour of Adjacent Street Ln(T) = 0.96 Ln(X) – 0.63 (61% in, 39% out) 20% (transit)
Retail/food service (Average of rates for Coffee/Donut Shop (LU 936), Fast Food Restaurant (LU 933), and Shopping Center (LU 820) land uses) - – The small commercial use on the site is anticipated to cater to local residents. It could include a combination of uses such as take-out food services, coffee shop, dry cleaners, and/or other convenience services.
Daily 2 192.0 trips /1,000 sf (50% in, 50% out) 66% 3 (internal)
AM Peak Hour of Adjacent Street 2 42.4 trips / 1,000 sf (50% in, 50% out) 75% 3 (internal)
PM Peak Hour of Adjacent Street 2 22.8 trips / 1,000 sf (50% in 50% out) 50% 3 (internal)
1. Institute of Transportation Engineers (ITE) Trip Generation, 10th Edition, September 2017. For residential equations, T = number of
trips, X = number of dwelling units; for commercial rates, “sf” = square feet.
2. Peak hour rates are the averages of rates for the three land uses; daily rate is average of Shopping Center and Fast-Food Restaurant
rates as there is no published daily rate for Coffee/Donut Shop.
3. Estimated based on expected use patterns. Retail typically generates little morning peak hour traffic unless it is occupied by a
coffee shop, in which case, trip reduction for internal trips would be highest in the morning. Vehicle trips were estimated using the rates and equations together with the internal- and transit-trip
reduction assumptions described above. The resulting vehicle trip estimates are summarized in Table 2. As shown, the site is expected to generate an estimated 1,640 vehicle trips per day with 82 trips during the AM peak hour and 133 trips during the PM peak hour.
Table 2. Vehicle Trips Generated by Site
Daily Trips
AM Peak Hour Trips PM Peak Hour Trips
Land Use Proposed Size In Out Total In Out Total
Apartments 390 units 1,540 8 58 66 73 44 117
Retail / Food Service 1 1,500 sf 100 8 8 16 8 8 16
Total Site 1,640 16 66 82 81 52 133
Source: Heffron Transportation, Inc., June 2021. Applied trip generation rates and vehicle adjustments presented in Table 1.
1. Assumed to be commercial retail / food service and/or convenience uses.
As described in the next section, WSDOT’s analysis of interchange improvements had assumed trips associated with the Kennydale Gateway site including trips to a 200-space Sound Transit park-and-ride lot, which are described in the subsequent section. New analysis was performed to adjust the site’s
estimated trip generation to the totals listed above.
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 6
4. Year 2025 Traffic Volumes
WSDOT, through its consultant HNTB, performed extensive analysis of the improvements at the NE 44th Street interchange. It evaluated future conditions without and with the improvements for the years 2025 and 2045. The full corridor growth assumptions were provided in the Transportation Discipline
Report: I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project (MP 0.0 to 11.9) and Downtown Bellevue Vicinity Express Toll Lanes Project (MP 11.9 to 14.6).9 The detailed traffic volumes and geometric assumptions were obtained from models provided by WSDOT in both the SIDRA software files (used to evaluate roundabouts) and Synchro software files (used to evaluate the intersection at Lake Washington Boulevard N / Seahawks Way).10 The year 2025 traffic volume conditions were used to evaluate the potential impacts of the Kennydale Gateway project. The year 2025 traffic volumes with WSDOT’s proposed interchange improvements
were gleaned from the models and are shown on Figure 3 and Figure 4 for the AM and PM peak hours, respectively. Volumes west of I-405 were adjusted to account for the current Kennydale Gateway development program and the relocation of the park-and-ride lot. Volumes at the HOV ramp
intersection and those east of I-405 were left unchanged from WSDOT’s original analysis to reflect worst-case conditions.
9 WSDOT, July 2018. 10 WSDOT/HNTB Sidra and Synchro models for year 2025 build (with interchange improvement) conditions.
Project
Site
StudyArea Intersection
Future Roundabout
Future Bus Rapid Transit (BRT) StationLake Washington Blvd N405
Seahawks Way
Northbound
On-Ramp
N 43rd St
Key
HOV Ramp
40 789 2
15 193 14
62
3
0
330
0
50
1,181
X
105
222
X
10
276
52
78 1
1,133
360
89
85
35
485
45
37
13 405 13
363
264
30
45
130
445
271
292
60
561
152
95
33
28
82
83 1
722
520
1
48
415
one way
Figure 3
Year 2025 Traffic Volumes
WSDOTAnalysis with SiteAccessAdjustments
AM Peak Hour
one
way
KENNYDALE
GATEWAY
N
Project
Site
StudyArea Intersection
Future Roundabout
Future Bus Rapid Transit (BRT) StationLake Washington Blvd N405
Seahawks Way
Northbound
On-Ramp
N 43rd St
Key
HOV Ramp
70 244 2
50 538 78
49
0
3
223
1
30
516
X
345
646
X
20
260
78
217 20
505
821
90
67
36
185
53
98
10 703 10
462
123
20
70
140
700
232
372
220
402
188
35
38
66
167
174 1
401
869
1
67
115
Figure 4
Year 2025 Traffic Volumes
WSDOTAnalysis with SiteAccessAdjustments
PM Peak Hour
one way
one
way
KENNYDALE
GATEWAY
N
KENNYDALE
GATEWAY
N
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 9
According to WSDOT,11 new traffic from three specific major developments were included in the year
2025 traffic volume forecasts at this interchange in addition to background growth:
• The Port Quendall Terminals development located on the north side of Lake Washington
Boulevard N between N 43rd Street and Seahawks Way;
• The Hawk’s Landing development located on the south side of Lake Washington Boulevard N
between the southbound I-405 on-ramp and N 43rd Street; and
• The Kennydale Mixed-Use development located on the south and east side of Lake Washington
Boulevard N.
The last development listed above is the subject site. The numbers of trips assumed to be generated by the subject site in the WSDOT analysis were derived from the traffic operations models. The WSDOT
analysis had assumed that the site would have two access driveways: the primary driveway was assumed to be a right-in/right-out only onto Lake Washington Boulevard N opposite Seahawks Way at the northwest corner of the site, a second access was assumed to connect to the proposed roundabout at
N 43rd Street. The numbers of peak hour trips assumed in WSDOT’s 2025 models are summarized in Table 3; the estimates prepared for the current proposal and described previously are included for comparison. As shown, the current proposal is expected to generate fewer trips than had already been assumed in the WSDOT analysis (241 fewer trips in the AM peak hour and 192 fewer trips in the PM peak hour). Therefore, the analysis performed by WSDOT presents a conservatively high estimate of trips and traffic operations.
Table 3. Comparison of Kennydale Gateway Site Trips to WSDOT Assumed Condition
AM Peak Hour Trips PM Peak Hour Trips
Analysis Condition In Out Total In Out Total
Assumed by WSDOT in its 2025 Models 1 167 156 323 151 174 325
Updated Estimate for Site (see Table 2) 16 66 82 81 52 133
Net Difference -151 -90 -241 -70 -122 -192
1. Determined from WSDOT / HNTB Sidra and Synchro models for year 2025 build (with interchange improvement) conditions.
5. Traffic Operations
Levels of service (LOS) for intersections at and near the NE 44th Street interchange were determined using WSDOT’s SIDRA and Synchro traffic operations models described earlier. Level of service, is a
measure of congestion, with LOS A reflecting good operations with little to no congestion and LOS F, reflecting poor operations with substantial congestion. While WSDOT had no targeted level of service standard for the I-405 corridor improvements, it did note intersections that would operate at or below
LOS E conditions. Table 4 summarizes intersection operations for year 2025 conditions, which as noted above, did account for development of the Kennydale Gateway site with more trips than expected from the current development program. Adjustments were made to the Seahawks Way and N 43rd Street intersections to remove the previously assumed secondary access for the Kennydale Gateway site at Seahawks Way. All
11 E-mail from Sean Quarrie of WSDOT to Marni Heffron, Heffron Transportation, March 8, 2019.
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 10
access to that site is now proposed to occur at N 43rd Street. As shown, all of the proposed intersections are expected to operate at good levels of service (LOS B or better) in the year 2025 with the proposed
interchange configuration.
Table 4. Intersection Level of Service – Year 2025 conditions
With Volumes Assumed by WSDOT a
Intersection Proposed Control AM Peak Hour PM Peak Hour
Lake Wash Blvd N / N 43rd St / Site Access Roundabout B A
Lake Washington Boulevard N / Seahawks Way Stop signs on Seahawks Wy / No left turns allowed A A
NE 44th St / SB Off and On Ramps Roundabout A A
NE 44th St / HOV Ramp Roundabout A A
NE 44th St / NB Off Ramp Roundabout A A
Lake Wash Blvd N / NB On-Ramp Roundabout A A
Source: Heffron Transportation, Inc., June 2021. Year 2025 SIDRA and Synchro files provided by WSDOT were used.
a. The WSDOT assumed volumes and geometries were used for all intersections except for the Lake Washington Boulevard N
intersections with N 43rd Street / Kennydale Gateway Access and Seahawks Way intersections, which were adjusted to reflect the
current traffic volume estimates for the Kennydale Gateway site. That roundabout was also assumed to have one approach lane
on all legs. WSDOT’s Transportation Discipline Report also assessed year 2045 conditions with the proposed improvements. That analysis showed that all of the roundabouts would continue to operate at LOS A in both the AM and PM peak hour conditions. The WSDOT analysis had assumed that the stop-controlled intersection at Lake Washington Boulevard N / Seahawks Way would degrade by 2045 to LOS C in the AM peak hour and LOS B in the PM peak hour, but that analysis assumed a driveway to the park-and-ride. Without either the park-and-ride or that driveway, this intersection would also operate at LOS A in 2045.
6. Future Roundabout at Lake Washington Blvd N / N 43rd Street
WSDOT’s NE 44th Street interchange improvements contemplate a future roundabout at the Lake Washington Boulevard N / N 43rd Street / Site Access intersection to be built by others. The roundabout configuration that WSDOT assumed had two lanes on each of the major Lake Washington Boulevard N
approaches, and one lane each on the minor N 43rd Street and the Site Access approaches. As previously noted, the WSDOT analysis had assumed a 200-stall park-and-ride lot on the site with a right-in/right-out only driveway on Lake Washington Boulevard N opposite Seahawks Way. The current proposed Kennydale Gateway site plan would have neither the park-and-ride lot nor this driveway. All site-generated traffic would arrive and depart the site through the roundabout at N 43rd
Street. Because the site generated volumes and access would differ from the prior WSDOT analysis, future operations for a roundabout at Lake Washington Boulevard N / N 43rd Street / Site Access were evaluated. It was determined that a single-lane roundabout (one approach lane in all directions) would
operate at LOS B during the AM peak hour and LOS A during the PM peak hour with the proposed project. The project proposes to construct a single-lane roundabout at this intersection.
Kennydale Gateway 4350 Lake Washington Boulevard N
Transportation Impact Analysis – REVISED
June 14, 2021 | 11
7. Summary
The proposed Kennydale Gateway site is expected to generate an estimated 1,640 vehicle trips per day with 82 trips during the AM peak hour and 133 trips during the PM peak hour. More traffic had been assumed by WSDOT in its plans and analysis for future improvements at the NE 44th Street interchange with I-405. The substantial upgrade to this interchange, which will replace the existing freeway overpass with an under-crossing, add a direct access ramp connection to the I-405 HOV lanes, and replace ramp junction intersections with roundabouts is expected to operate very well in the future. Analysis determined that the proposed ramp intersections would operate at LOS A in the year 2025 and beyond with growth associated with the Kennydale Gateway and other local projects. The project would construct a single-lane roundabout at the Lake Washington Boulevard N / N 43rd Street / Site Access intersection. This roundabout is expected to operate at LOS B during the AM peak hour and
LOS A during the PM peak hour. No further mitigation would be needed to accommodate the project.
MCH/tsm
Kennydale Gateway Traffic Impact Analysis - REVISED - 06-14-2021.docx
6544 NE 61st Street Seattle, WA 98115 206-523-3939 hefftrans.com
TECHNICAL MEMORANDUM
Project: Kennydale Gateway
4350 Lake Washington Boulevard N, Renton, WA
Subject: Response to City Comments about Transportation
Date: March 3, 2022
Author: Marni Heffron, P.E., P.T.O.E.
This memorandum responds to the City of Renton’s transportation-related comments presented in its On Hold Notice from February 14, 2022. The City’s comments related to the Transportation Impact
Analysis (TIA) – Revised for Kennydale Gateway (Heffron Transportation, Inc., June 14, 2021). The specific transportation-related comments are listed below along with the responses.
Response to City Comments
Comment T-1: The TIA refers to various studies done by WSDOT. The TIA shall be updated to include all referenced WSDOT studies for the intersection and proposed round-a-about.
Response: The following details the WSDOT information that was utilized to prepare the TIA and operations analysis. The e-mail received from WSDOT with links to various data and analysis files has
been forwarded to City staff.1
• Transportation Discipline Report: I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project (MP 0.0 to 11.9) and Downtown Bellevue Vicinity Express Toll Lanes Project (MP 11.9 to 14.6), July 2018. This document detailed analysis for the full corridor including specific assumptions for
the NE 44th Street interchange.
• Concept Plan for I-405/NE 44th Street Intersection, WSDOT and Flatiron Land, July 2020. This reflects the revised design-build concept to locate the new interchange under I-405 (prior design concepts had located it over I-405).
• Sidra files of NE 44th Street interchange and Synchro file of Lake Washington Boulevard N /
Seahawks Way – Year 2025 conditions, HNTB, date unknown. These files were transmitted to Heffron Transportation, Inc. by WSDOT in an e-mail and drop-box exchange on April 22, 2019
specifically for use on the Kennydale Gateway analysis. Minor adjustments were made by Heffron Transportation to the models to reflect the revised interchange concept proposed by Flatiron Land, WSDOT’s contractor.
1 E-mail sent from Marni Heffron to Nathan Janders on February, 24, 2022.
RECEIVED
Clark Close 05/04/2022
PLANNING DIVISION
Kennydale Gateway (SDCI MUP #3035807-LU) Response to City Comments about Transportation
March 3, 2022 | 2
Comment T-2: The TIA should be updated to include N 41st St/Lake Washington Blvd N as a study intersection.
Response: The intersection of N 41st Street / Lake Washington Boulevard N is located south of the Kennydale Gateway site. N 41st Street becomes Wells Avenue N just west of the intersection. This street is one of three access routes to the Barbee Mill residential development to the west. That development can also access Lake Washington Boulevard further north at N 43rd Street and further south at N 37th Street.
New turning movement counts were performed at the N 41st Street / Lake Washington Boulevard N intersection on Tuesday, March 1, 2022. Those new traffic counts are attached. A count on Wells Avenue N, performed on October 24, 2019, was used to adjust the side-street volumes to reflect pre-pandemic conditions. It is noted that both sets of counts show relatively low volumes entering and exiting the residential area via N 41st Street, likely due to the fact that there are alternative development access points both north and south of N 41st Street.
Year 2025 traffic volume forecasts without the Kennydale Gateway project were derived from WSDOT forecasts at the next intersection north. Those forecasts were presented in Figures 3 and 4 of the previously referenced Transportation Impact Analysis (TIA) – Revised for Kennydale Gateway. It is noted that those forecasts reflect substantial growth in through traffic on Lake Washington Boulevard compared to existing 2021 conditions. For example, AM peak hour traffic is estimated to increase from an existing level of about 520 vehicles per hour (vph) (total in both directions) to over 1,070 vph by 2025, which would be more than a 200% increase. Likewise, PM peak hour traffic was estimated to increase from about 460 vph to about 880 vph by 2025. Finally, Kennydale Gateway trips from those same figures were added to Lake Washington Boulevard N as through traffic.
Levels of service for the intersection were determined based on methodologies established in the Highway Capacity Manual (HCM), 6th Edition2 using the Synchro 10.3 analysis software. The existing intersection has a single approach lane on all three legs with a stop sign controlling eastbound traffic. There are bike
lanes in both directions and a trail crossing N 41st Street west of the intersection. The existing speed limit on Lake Washington Boulevard N is posted at 25 mph. The traffic volumes described above along with the peak hour factors, pedestrian, bicycle, and heavy vehicle attributes based on the new counts were
inputs to the model. The traffic volume estimates for each condition are attached. The analysis determined that eastbound movements from the stop sign are expected to operate at LOS C in 2025 during both peak hours even with the substantial increases in traffic on Lake Washington Boulevard N. The Kennydale Gateway project would not change the levels of service, and is expected to increase delay by a negligible amount (0.1 second added average delay per vehicle or less). The level of service calculations are attached.
Based on this analysis, the project is not expected to adversely affect then 41st Street / Lake Washington Boulevard N intersection. Attachments: Traffic Volume Data and Level of Service Calculations
Kennydale Gateway - Response to City Transportation-related Comments - FINAL 03-03-2022
2 Transportation Research Board 2016.
ATTACHMENT
TRAFFIC VOLUME DATA &
LEVEL OF SERVICE CALCULATIONS
www.idaxdata.com
to
to
Two-Hour Count Summaries
Note: Two-hour count summary volumes include heavy vehicles but exclude bicycles in overall count.
Total
0
0
1
0
2
1
0
0
4
4
WB --
NB 4.9%0.86
Peak Hour: 7:30 AM 8:30 AM
HV %:PHF
EB 0.0%0.75
Date: 3/1/2022
Peak Hour Count Period: 7:00 AM 9:00 AM
SB 4.2%0.79
TOTAL 4.8%0.86
TH RTUTLTTHRTUTLT
Rolling
One HourEastboundWestboundNorthboundSouthbound
UT LT TH RT
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
TotalUTLTTHRT
0 0 0 0 0 0
0 10 0 85 0
7:15 AM 0 0 0 1
0 0 0 75 0 07:00 AM 0 0 0 0 0 0 0
0 18 0 131 0
7:45 AM 0 1 0 0
0 0 0 112 0 0
104 0
7:30 AM 0 1 0 0 0 0 0
86 0 0 0 15 2
152 472
8:00 AM 0 0 0 0 0 0 0
123 0 0 0 28 0000000
0 0 0 0 0 1
0 19 0 127 514
8:15 AM 0 0 0 1
0 0 0 108 0 0
0 24 2 117 509
8:45 AM 0 2 0 1
0 0 1 89 0 0
113 523
8:30 AM 0 1 0 0 0 0 0
81 0 0 0 29 1
118 47594000210000000
Count Total 0 5 0 3 0 0 0 0 164 5 947 0
Peak
Hour
All 0 2 0
0 0 2 768 0 0
0 0 4 0 25 00000210
1 523 0
HV 0 0 0 0 0 0
1 424 0 0 0 94100000
0
Interval
Start
Heavy Vehicle Totals Bicycles Pedestrians (Crossing Leg)
EB WB NB SB Total
---4%0%5%----0%5%HV%-0%-0%-
0 0
7:15 AM 0 0 3 1 4 0 0
0 0 0 0 0 0
West North South
7:00 AM 0 0 4 0 4 0
EB WB NB SB Total East
7:45 AM 0 0 6 1 7
0 0 0 1 0 0
0
7:30 AM 0 0 2 0 2 0 0 0
0 0 0 0 0 0
0 1
8:15 AM 0 0 4 3 7 0 0
0 0 1 1 0 1
0 0 0
8:00 AM 0 0 9 0 9 0
0 0 0 0 0 0
8:45 AM 0 0 9 1 10
0 0 0 0 0 0
0
8:30 AM 0 0 6 0 6 0 0 0
0 0 0 0 1 0
0 0 0000000
0 1
Peak Hr 0 0 21 4 25 0 0
0 0 1 1 0 3Count Total 0 0 43 6 49 0
1011030
0
0 01000
13 0N
Lake Washington Blvd
41st St
Lake Washington BlvdLake Washington Blvd41st St
523TEV:
0.86PHF:19495426042414259501
23
2 0
project.manager.wa@idaxdata.com
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Two-Hour Count Summaries - Heavy Vehicles
Two-Hour Count Summaries - Bikes
Note: U-Turn volumes for bikes are included in Left-Turn, if any.
Northbound Southbound
UT LT TH RT UT LT TH RT
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
Total
Rolling
One HourEastboundWestbound
0 0 0 4 0
7:15 AM 0 0 0 0
0 0 0 4 0 0
TH RT
7:00 AM 0 0 0 0 0 0 0
UT LT TH RT UT LT
4 0
7:30 AM 0 0 0 0 0 0 0
3 0 0 0 1 0000000
0 0 0 0 0 0
0 0 0 2 0
7:45 AM 0 0 0 0
0 0 0 2 0 0
0 0 0 9 22
8:15 AM 0 0 0 0
0 0 0 9 0 0
7 17
8:00 AM 0 0 0 0 0 0 0
6 0 0 0 1 0
7 25
8:30 AM 0 0 0 0 0 0 0
4 0 0 0 3 0000000
0 0 0 0 0 0
0 0 0 6 29
8:45 AM 0 0 0 0
0 0 0 6 0 0
10 32900010
0 6 0 49 0
Peak Hour 0 0 0 0
0 0 0 43 0 0Count Total 0 0 0 0 0 0 0
Westbound Northbound Southbound
LT TH RT LT TH RT LT
25 0
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
Total
Rolling
One HourEastbound
21 0 0 0 4 0000000
0 0 0 0
7:15 AM 0 0 0 0 0
0 0 0 0 0 0
TH RT LT TH RT
7:00 AM 0 0 0 0
0 0
7:45 AM 0 0 0 0 0 0 0
0 0 0 0 0 0
0 0 0
7:30 AM 0 0 0 0 0 0
0 0 0 0 0 0
8:15 AM 0 0 0 0 0
0 0 1 0 1 1
0
8:00 AM 0 0 0 0 0 0 0 0
0 0 0 0 0 0
0 1
8:45 AM 0 0 0 0 0 0 0
0 0 0 0 0 0
0 0 1
8:30 AM 0 0 0 0 0 0
0 0 0 0 0 0
1000000
0 1 0 1 0Count Total 0 0 0 0 0 0 0 0
0 1 0000001Peak Hour 0 0 0 0 0
0
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to
to
Two-Hour Count Summaries
Note: Two-hour count summary volumes include heavy vehicles but exclude bicycles in overall count.
Total
2
2
1
1
1
1
0
0
8
4
WB --
NB 0.9%0.92
Peak Hour: 4:30 PM 5:30 PM
HV %:PHF
EB 0.0%0.75
Date: 3/1/2022
Peak Hour Count Period: 4:00 PM 6:00 PM
SB 2.0%0.86
TOTAL 1.7%0.92
TH RTUTLTTHRTUTLT
Rolling
One HourEastboundWestboundNorthboundSouthbound
UT LT TH RT
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
TotalUTLTTHRT
0 0 0 0 0 2
0 86 1 124 0
4:15 PM 0 2 0 1
0 0 0 37 0 04:00 PM 0 0 0 0 0 0 0
0 79 0 111 0
4:45 PM 0 0 0 1
0 0 1 30 0 0
108 0
4:30 PM 0 0 0 1 0 0 0
28 0 0 0 74 1
114 457
5:00 PM 0 0 0 1 0 0 0
30 0 0 0 81 1000001
0 0 0 0 0 1
0 99 2 127 460
5:15 PM 0 0 0 0
0 0 0 25 0 0
0 77 0 107 462
5:45 PM 0 0 0 0
0 0 0 28 0 0
114 466
5:30 PM 0 2 0 0 0 0 0
26 0 0 0 87 0
109 45737000711000000
Count Total 0 4 0 4 0 0 0 0 654 6 914 0
Peak
Hour
All 0 0 0
0 0 5 241 0 0
0 0 7 0 8 0000010
3 466 0
HV 0 0 0 0 0 0
3 111 0 0 0 346300000
0
Interval
Start
Heavy Vehicle Totals Bicycles Pedestrians (Crossing Leg)
EB WB NB SB Total
---2%0%2%----0%1%HV%---0%-
0 2
4:15 PM 0 0 3 1 4 0 0
0 1 0 1 0 0
West North South
4:00 PM 0 0 1 4 5 0
EB WB NB SB Total East
4:45 PM 0 0 0 1 1
2 4 0 1 0 0
0
4:30 PM 0 0 1 3 4 0 0 2
0 0 0 0 2 0
0 0
5:15 PM 0 0 0 0 0 0 0
0 2 2 6 0 1
1 0 0
5:00 PM 0 0 0 3 3 2
0 0 1 3 4 0
5:45 PM 0 0 0 1 1
0 1 0 0 0 0
0
5:30 PM 0 0 2 0 2 0 0 1
1 0 1 0 1 0
0 0 0001230
0 2
Peak Hr 0 0 1 7 8 2 0
0 9 9 20 0 6Count Total 0 0 7 13 20 2
06715040
2
0 07600
04 0N
Lake Washington Blvd
41st St
Lake Washington BlvdLake Washington Blvd41st St
466TEV:
0.92PHF:33463491110111311434903
03
6 0
project.manager.wa@idaxdata.com
www.idaxdata.com
Two-Hour Count Summaries - Heavy Vehicles
Two-Hour Count Summaries - Bikes
Note: U-Turn volumes for bikes are included in Left-Turn, if any.
Northbound Southbound
UT LT TH RT UT LT TH RT
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
Total
Rolling
One HourEastboundWestbound
0 4 0 5 0
4:15 PM 0 0 0 0
0 0 0 1 0 0
TH RT
4:00 PM 0 0 0 0 0 0 0
UT LT TH RT UT LT
4 0
4:30 PM 0 0 0 0 0 0 0
2 0 0 0 1 0000001
0 0 0 0 0 0
0 3 0 4 0
4:45 PM 0 0 0 0
0 0 0 1 0 0
0 3 0 3 12
5:15 PM 0 0 0 0
0 0 0 0 0 0
1 14
5:00 PM 0 0 0 0 0 0 0
0 0 0 0 1 0
0 8
5:30 PM 0 0 0 0 0 0 0
0 0 0 0 0 0000000
0 0 0 0 0 0
0 0 0 2 6
5:45 PM 0 0 0 0
0 0 0 2 0 0
1 6000010
0 13 0 20 0
Peak Hour 0 0 0 0
0 0 1 6 0 0Count Total 0 0 0 0 0 0 0
Westbound Northbound Southbound
LT TH RT LT TH RT LT
8 0
Interval
Start
41st St 0 Lake Washington Blvd Lake Washington Blvd 15-min
Total
Rolling
One HourEastbound
1 0 0 0 7 0000000
0 0 1 0
4:15 PM 0 0 0 0 0
0 0 1 0 0 0
TH RT LT TH RT
4:00 PM 0 0 0 0
4 0
4:45 PM 0 0 0 0 0 0 0
0 2 0 0 2 0
0 0 0
4:30 PM 0 0 0 0 0 0
0 0 0 0 0 0
5:15 PM 0 0 0 0 0
0 0 2 0 6 14
9
5:00 PM 0 0 2 0 0 0 0 2
1 0 0 3 0 4
1 12
5:45 PM 0 0 0 0 0 0 0
1 0 0 0 0 0
0 1 15
5:30 PM 0 0 0 0 0 0
0 0 1 0 0 0
11100203
0 9 0 20 0Count Total 0 0 2 0 0 0 2 7
0 15 0006007Peak Hour 0 0 2 0 0
0
project.manager.wa@idaxdata.com
Location:Wells Ave W-O Lake Washington Blvd
Date Range:10/24/2019 - 10/30/2019
Site Code:02
Time EB WB Total EB WB Total EB WB Total EB WB Total
12:00 AM 0 0 0 0 0 0 1 2 3 0 0 0
1:00 AM 0 0 0 0 0 0 0 0 0 0 0 0
2:00 AM 2 2 4 0 0 0 0 0 0 2 2 4
3:00 AM 0 0 0 1 1 2 1 1 2 0 0 0
4:00 AM 1 0 1 1 0 1 0 0 0 1 0 1
5:00 AM 0 0 0 1 0 1 0 0 0 0 0 0
6:00 AM 5 3 8 2 0 2 0 0 0 5 3 8
7:00 AM 4 2 6 3 1 4 2 1 3 4 2 6
8:00 AM 5 2 7 5 1 6 3 0 3 5 2 7
9:00 AM 9 9 18 7 1 8 4 4 8 9 9 18
10:00 AM 4 12 16 4 5 9 4 7 11 4 12 16
11:00 AM 10 5 15 12 3 15 5 2 7 10 5 15
12:00 PM 9 6 15 8 11 19 7 8 15 9 6 15
1:00 PM 8 7 15 7 5 12 8 10 18 8 7 15
2:00 PM 4 8 12 4 9 13 9 13 22 4 8 12
3:00 PM 4 7 11 4 7 11 7 9 16 4 7 11
4:00 PM 10 7 17 6 4 10 5 13 18 10 7 17
5:00 PM 7 7 14 4 7 11 9 7 16 7 7 14
6:00 PM 2 5 7 4 5 9 7 6 13 2 5 7
7:00 PM 0 6 6 0 6 6 6 0 6 0 6 6
8:00 PM 3 3 6 5 6 11 1 5 6 3 3 6
9:00 PM 2 5 7 3 2 5 2 2 4 2 5 7
10:00 PM 0 1 1 0 1 1 2 2 4 0 1 1
11:00 PM 1 2 3 1 3 4 3 3 6 1 2 3
Total 90 99 189 82 78 160 86 95 181 90 99 189
Percent 48%52%-51%49%-48%52%-48%52%-
1. Mid-week average includes data between Tuesday and Thursday.
10/25/2019 10/26/2019
Thursday Friday Saturday
Mid-Week Average10/24/2019
Kennydale Gateway - AM Peak Hour 2025 without Project
3: Lake Wash Blvd & N 41st St HCM 6th TWSC
Kennydale Gateway - AM Peak Hour 03/03/2022 2025 without Project Synchro 10 Report
MCH
Intersection
Int Delay, s/veh 0.1
Movement EBL EBR NBL NBT SBT SBR
Lane Configurations
Traffic Vol, veh/h 4 2 2 826 242 1
Future Vol, veh/h 4 2 2 826 242 1
Conflicting Peds, #/hr 3 30003
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 -----
Veh in Median Storage, # 0 - - 0 0 -
Grade, % 0 - - 0 0 -
Peak Hour Factor 75 75 86 86 79 79
Heavy Vehicles, % 0 00540
Mvmt Flow 5 3 2 960 306 1
Major/Minor Minor2 Major1 Major2
Conflicting Flow All 1277 313 310 0 - 0
Stage 1 310 -----
Stage 2 967 -----
Critical Hdwy 6.4 6.2 4.1 - - -
Critical Hdwy Stg 1 5.4 -----
Critical Hdwy Stg 2 5.4 -----
Follow-up Hdwy 3.5 3.3 2.2 - - -
Pot Cap-1 Maneuver 185 732 1262 - - -
Stage 1 748 -----
Stage 2 372 -----
Platoon blocked, % - - -
Mov Cap-1 Maneuver 183 728 1258 - - -
Mov Cap-2 Maneuver 183 -----
Stage 1 744 -----
Stage 2 371 -----
Approach EB NB SB
HCM Control Delay, s 20.3 0 0
HCM LOS C
Minor Lane/Major Mvmt NBL NBTEBLn1 SBT SBR
Capacity (veh/h) 1258 - 244 - -
HCM Lane V/C Ratio 0.002 - 0.033 - -
HCM Control Delay (s) 7.9 0 20.3 - -
HCM Lane LOS A A C - -
HCM 95th %tile Q(veh) 0 - 0.1 - -
Kennydale Gateway - AM Peak Hour 2025 with Project
3: Lake Wash Blvd & N 41st St HCM 6th TWSC
Kennydale Gateway - AM Peak Hour 03/03/2022 2025 without Project Synchro 10 Report
MCH
Intersection
Int Delay, s/veh 0.1
Movement EBL EBR NBL NBT SBT SBR
Lane Configurations
Traffic Vol, veh/h 4 2 2 828 242 1
Future Vol, veh/h 4 2 2 828 242 1
Conflicting Peds, #/hr 3 30003
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 -----
Veh in Median Storage, # 0 - - 0 0 -
Grade, % 0 - - 0 0 -
Peak Hour Factor 75 75 86 86 79 79
Heavy Vehicles, % 0 00540
Mvmt Flow 5 3 2 963 306 1
Major/Minor Minor2 Major1 Major2
Conflicting Flow All 1280 313 310 0 - 0
Stage 1 310 -----
Stage 2 970 -----
Critical Hdwy 6.4 6.2 4.1 - - -
Critical Hdwy Stg 1 5.4 -----
Critical Hdwy Stg 2 5.4 -----
Follow-up Hdwy 3.5 3.3 2.2 - - -
Pot Cap-1 Maneuver 185 732 1262 - - -
Stage 1 748 -----
Stage 2 371 -----
Platoon blocked, % - - -
Mov Cap-1 Maneuver 183 728 1258 - - -
Mov Cap-2 Maneuver 183 -----
Stage 1 744 -----
Stage 2 370 -----
Approach EB NB SB
HCM Control Delay, s 20.3 0 0
HCM LOS C
Minor Lane/Major Mvmt NBL NBTEBLn1 SBT SBR
Capacity (veh/h)1258 - 244 - -
HCM Lane V/C Ratio 0.002 - 0.033 - -
HCM Control Delay (s) 7.9 0 20.3 - -
HCM Lane LOS A A C - -
HCM 95th %tile Q(veh) 0 - 0.1 - -
Kennydale Gateway - PM Peak Hour 2025 without Project
3: Lake Wash Blvd & N 41st St HCM 6th TWSC
Kennydale Gateway - PM Peak Hour 03/03/2022 2025 without Project Synchro 10 Report
MCH
Intersection
Int Delay, s/veh 0.3
Movement EBL EBR NBL NBT SBT SBR
Lane Configurations
Traffic Vol, veh/h 7 4 5 307 564 4
Future Vol, veh/h 7 4 5 307 564 4
Conflicting Peds, #/hr 4 40004
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 -----
Veh in Median Storage, # 0 - - 0 0 -
Grade, % 0 - - 0 0 -
Peak Hour Factor 75 75 92 92 86 86
Heavy Vehicles, % 0 00120
Mvmt Flow 9 5 5 334 656 5
Major/Minor Minor2 Major1 Major2
Conflicting Flow All 1011 667 665 0 - 0
Stage 1 663 -----
Stage 2 348 -----
Critical Hdwy 6.4 6.2 4.1 - - -
Critical Hdwy Stg 1 5.4 -----
Critical Hdwy Stg 2 5.4 -----
Follow-up Hdwy 3.5 3.3 2.2 - - -
Pot Cap-1 Maneuver 268 462 934 - - -
Stage 1 516 -----
Stage 2 719 -----
Platoon blocked, % - - -
Mov Cap-1 Maneuver 264 458 930 - - -
Mov Cap-2 Maneuver 264 -----
Stage 1 510 -----
Stage 2 716 -----
Approach EB NB SB
HCM Control Delay, s 17.1 0.1 0
HCM LOS C
Minor Lane/Major Mvmt NBL NBTEBLn1 SBT SBR
Capacity (veh/h)930 - 312 - -
HCM Lane V/C Ratio 0.006 - 0.047 - -
HCM Control Delay (s) 8.9 0 17.1 - -
HCM Lane LOS A A C - -
HCM 95th %tile Q(veh) 0 - 0.1 - -
Kennydale Gateway - PM Peak Hour 2025 with Project
3: Lake Wash Blvd & N 41st St HCM 6th TWSC
Kennydale Gateway - PM Peak Hour 03/03/2022 2025 without Project Synchro 10 Report
MCH
Intersection
Int Delay, s/veh 0.3
Movement EBL EBR NBL NBT SBT SBR
Lane Configurations
Traffic Vol, veh/h 7 4 5 309 567 4
Future Vol, veh/h 7 4 5 309 567 4
Conflicting Peds, #/hr 4 40004
Sign Control Stop Stop Free Free Free Free
RT Channelized - None - None - None
Storage Length 0 -----
Veh in Median Storage, # 0 - - 0 0 -
Grade, % 0 - - 0 0 -
Peak Hour Factor 75 75 92 92 86 86
Heavy Vehicles, % 0 00120
Mvmt Flow 9 5 5 336 659 5
Major/Minor Minor2 Major1 Major2
Conflicting Flow All 1016 670 668 0 - 0
Stage 1 666 -----
Stage 2 350 -----
Critical Hdwy 6.4 6.2 4.1 - - -
Critical Hdwy Stg 1 5.4 -----
Critical Hdwy Stg 2 5.4 -----
Follow-up Hdwy 3.5 3.3 2.2 - - -
Pot Cap-1 Maneuver 266 460 931 - - -
Stage 1 515 -----
Stage 2 718 -----
Platoon blocked, % - - -
Mov Cap-1 Maneuver 262 457 927 - - -
Mov Cap-2 Maneuver 262 -----
Stage 1 509 -----
Stage 2 715 -----
Approach EB NB SB
HCM Control Delay, s 17.2 0.1 0
HCM LOS C
Minor Lane/Major Mvmt NBL NBTEBLn1 SBT SBR
Capacity (veh/h)927 - 310 - -
HCM Lane V/C Ratio 0.006 - 0.047 - -
HCM Control Delay (s) 8.9 0 17.2 - -
HCM Lane LOS A A C - -
HCM 95th %tile Q(veh) 0 - 0.1 - -