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| Region: Puget Sound | Legislative District: 32 | Length: 0.13 mi. | FY 2023 Urban Arterial Program (UAP) |
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Existing ConditionsThe 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. |
Project Funding
| TIB Funds | Local Funds | Total Costs | |
|---|---|---|---|
| Design | 0 | 4,500,000 | 4,500,000 |
| Right of Way | 1,000,000 | 4,000,000 | 5,000,000 |
| Construction | 4,000,000 | 16,700,000 | 20,700,000 |
| Project Totals | $5,000,000 | $25,200,000 | $30,200,000 |
Local Match
| TIB Participation | Local Match | Minimum Local Match |
|---|---|---|
| 16.6% | 83.4% | 20% |
Summary of Improvements
- 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.
Description of Improvements
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.