The 145th Street Corridor (SR523) runs 3 miles east/west and is the border between the cities of Shoreline and Seattle it connects with SR99 (west) and SR522 (east) and midway includes an interchange with I-5. The average daily traffic on this corridor is up to 30,000+ ADT with a high-volume history of accidents. A large part of this corridor is transitioning from single family residential to multifamily. Currently, bottlenecks occur with in-lane left-turns utility poles make sidewalks impassable for a wheelchair or stroller it is an unfriendly corridor for bicyclists and due to congestion was largely avoided by transit. Sound Transit is opening light rail immediately northeast of the I-5 Interchange in August 2024 and King County Metro will begin new frequent service in September 2024 to access the new light rail station (BRT east of I-5 starts in 2027). With this new regional transit coming to Shoreline, the City began a planning study/public outreach (2015) to analyze improvements needed on the corridor to increase safety and accessibility. The study led to two Shoreline capital improvement projects I-5/145th Street Interchange Project (constructing roundabouts and re-channelizing bridge deck) and the 145th Street Corridor Project, I-5 to Aurora Ave (Interurban Trail). The latter has been divided into phases to complete. This application seeks ROW and Construction funding for Phase 2 and 3 (Corliss Ave to Interurban Trail) which will complete this corridor project.
Projects — TIB Project Information
TIB Project Information
City of Shoreline's 145th Street Corridor Phases 2 and 3
8-1-202(010)-1
8-1-202(010)-1
145th Street Corridor Phases 2 and 3
Corliss Ave N to Interurban Trail
FY 2026 Urban Arterial Program
Current Phase : Design
Total TIB Funding : $6,500,000
County: King | Legislative District: 32 | Project Length: 0.70 | TIB Engineer: Greg Armstrong | Last Payment Date:
Project Information
| Lead Agency | SHORELINE |
| Funding Year | 2026 |
| Program | UAP |
| Current Phase | Design |
| Legislative District | 32, 46 |
| Congressional District | 7 |
| Federal Route Number | 0523 |
| Project Length | 0.70 mi. |
| ADT | 22,000 |
| Functional Class | Principal |
| Type of Work | Major Widening |
| Project Contact | Cory Nau |
| Contact Email | cnau@shorelinewa.gov |
| TIB Engineer | Greg Armstrong |
| Last Payment Date | |
| Cultural Resource Assessment | Section 106 |
Project Schedule
| Target Date | Actual Date | |
|---|---|---|
| Project Selection Date | 11/22/2024 | |
| Delayed Project Date | 07/01/2029 | |
| DAHP Assessment Date | 02/25/2020 | |
| Predesign Approval | ||
| Design Approval | 03/13/2025 | 03/12/2025 |
| Bid Auth. Approval | 08/01/2026 | |
| Construction Approval | 12/04/2026 | |
| Project Closeout | 12/31/2028 | |
| Audit Date | ||
| Withdrawn Date |
Project Funding
| TIB Funds | Project Costs | |
|---|---|---|
| Environmental Study | 0 | 0 |
| Design Study | 0 | 0 |
| Total Predesign | 0 | 0 |
| Special Study | 0 | 0 |
| Design | 0 | 0 |
| Right of Way | 2,120,000 | 10,113,500 |
| Total Design | 2,120,000 | 10,113,500 |
| Construction Engineering | 630,000 | 2,552,400 |
| Construction Contract | 3,750,000 | 15,014,140 |
| Other Construction | 0 | 0 |
| Total Construction | 4,380,000 | 17,566,540 |
| Total TIB Funding | 6,500,000 | 27,680,040 |
Local Funding Partners
| Funding Amount | Percent | |
|---|---|---|
| SHORELINE | 2,429,919 | 8.8% |
| WSDOT Funding | 0 | 0.0% |
| FHWA STP | 5,480,000 | 19.8% |
| RAISE | 13,270,121 | 47.9% |
| Total Local Funding | 21,180,040 | 76.5% |
Project Description
This project will improve safety and operations to reduce traffic delay increasing transit speed/reliability creating better access for people moving along the corridor and accessing new light rail. Design includes signalized intersection improvements and signal timing adjustments. Included will be new dedicated left turn lanes with phasing at Meridian Ave longer left turn queue EB approaching Aurora Ave and curbing to prevent left turns from NB Midvale and Lenora Ave which currently turn into the Aurora WB turn queue (accident reduction measures). Project removes obstacles to pedestrians on both sides of street and includes improved sidewalks and crosswalks, pedestrian countdown signals, and ADA accessible curb ramps. North side improvements will provide a higher comfort/safety level with wider sidewalk and amenity zone. Project improves pedestrian lighting advances bus stop access/user experience and re-directs bicyclists to off-corridor facilities. Conflict points will be reduced to help reduce accidents. Improvements will help reduce congestion and benefit access, mobility, and safety for all modes of transportation. Project supports two growing candidate Countywide Centers (Shoreline has rezoned up to MUR-70) helping provide access to the many employment, educational, commercial, and recreational opportunities that connecting with a regional transit system provides and helping to maximize the return on the Sound Transit multi-billion dollar investment.
Existing Condition
Project Benefits
- Improves safety;
- Completes gap;
- Relieves congestion;
- Removes ADA barriers;
- Builds multimodal facilities
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Project Delays
| Delay Type | Resolution Date | Comments |
|---|---|---|
No delayed project history. |
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