The 145th Street/I-5 Interchange is a bottleneck for vehicles (with a failing level of service) and vehicle and pedestrian accidents remain high for this region. 145th Street (SR 523) crosses over I-5 on an existing bridge deck with narrow 6-foot sidewalks, two eastbound(EB)/two westbound(WB) travel lanes (each 11-12 feet wide), and a center lane with EB/WB left turn pockets. The left turn pockets are inadequate to handle traffic volumes queues spill back into travel lanes causing significant back-ups. Existing sidewalks are substandard for the pedestrian/bicycle traffic predicted by the opening of the light rail station in 2024. Due to congestion, transit agencies historicaly had limited service in this area. When the light rail station opens, transit (including future Sound Transit BRT, delayed until 2026) will depend on the interchange for success. Two thirds of light rail users are projected to access the 145th station by transit or walking with over 20,000 transit riders projected (2040). Since the station area has been upzoned to encourage TOD, area population will continue to grow.
Projects — TIB Project Information
TIB Project Information
City of Shoreline's 145th Street (SR 523)
8-1-202(008)-1
8-1-202(008)-1
145th Street (SR 523)
3rd Ave NE to 5th Ave NE (I-5 Interchange)
FY 2023 Urban Arterial Program
Current Phase : Construction
Total TIB Funding : $5,000,000
County: King | Legislative District: 32 | Project Length: 0.13 | TIB Engineer: Greg Armstrong | Last Payment Date: 02/12/2024
Project Information
| Lead Agency | SHORELINE |
| Funding Year | 2023 |
| Program | UAP |
| Current Phase | Construction |
| Legislative District | 32, 46 |
| Congressional District | 7 |
| Federal Route Number | 0523 |
| Project Length | 0.13 mi. |
| ADT | 30,000 |
| Functional Class | Principal |
| Type of Work | Traffic Control |
| Project Contact | Nytasha Walters |
| Contact Email | nwalters@shorelinewa.gov |
| TIB Engineer | Greg Armstrong |
| Last Payment Date | 02/12/2024 |
| Cultural Resource Assessment | Section 106 |
Project Schedule
| Target Date | Actual Date | |
|---|---|---|
| Project Selection Date | 11/19/2021 | |
| Delayed Project Date | 07/01/2026 | |
| DAHP Assessment Date | 09/07/2021 | |
| Predesign Approval | ||
| Design Approval | 02/19/2022 | 02/24/2022 |
| Bid Auth. Approval | 10/01/2023 | 10/10/2023 |
| Construction Approval | 11/30/2023 | 12/14/2023 |
| Project Closeout | 09/30/2025 | |
| 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| Withdrawn Date |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 | 8,374,100 |
| Right of Way | 1,000,000 | 3,232,100 |
| Total Design | 1,000,000 | 11,606,200 |
| Construction Engineering | 520,000 | 3,237,100 |
| Construction Contract | 3,480,000 | 25,778,377 |
| Other Construction | 0 | 0 |
| Total Construction | 4,000,000 | 29,015,477 |
| Total TIB Funding | 5,000,000 | 40,621,677 |
Local Funding Partners
| Funding Amount | Percent | |
|---|---|---|
| SHORELINE | 9,009,099 | 22.2% |
| WSDOT Funding | 0 | 0.0% |
| Federal STP (Design) | 3,892,500 | 9.6% |
| Federal STP (CN) | 4,920,000 | 12.1% |
| Sound Transit | 10,000,000 | 24.6% |
| Regional Mobility | 5,000,000 | 12.3% |
| Connecting Washington | 2,800,078 | 6.9% |
| Total Local Funding | 35,621,677 | 87.7% |
Project Description
Improvements include replacing two signalized intersections with modern roundabouts and repurposing the bridge deck to remove the left turn pockets (not needed with roundabouts) in order to add a wide pedestrian/bicycle facility. The proposed improvements will substantially benefit access, mobility, and safety for all modes of transportation. The project will reduce congestion and improve mobility for buses and vehicles and raise the interchange level of service from poor or failing intersections to intersections operating at acceptable levels. The design will enable 35,000 vehicles and ultimately over 40,000 transit riders to reliably travel across the corridor to reach the light rail station and other destinations, supporting and sustaining a good quality of life and a booming regional economy. By constructing an appropriate pedestrian/bicycle facility on the bridge deck, accidents will be reduced by providing those users a wider space on the bridge deck that is not in conflict with vehicles.
Existing Condition
Project Benefits
- This project helps maximize return on investments in Sound Transit light rail & regional transportation network. Reduction of conflict points will reduce the number of accidents, reduce congestion & increase mobility. Air quality will be improved;
- as more drivers switch to other modes of transportation (buses, light rail, bikes, walking), traffic congestion will be reduced. The project will support new TOD near the light rail station providing a community benefit. New bike facilities support cross-town & transit access.
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Project Delays
| Delay Type | Resolution Date | Comments |
|---|---|---|
No delayed project history. |
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