Puget Sound Gateway Program Map
The SR 167 and SR 509 extensions will complete the missing highway system links to I-5 that offer commuter and freight mobility benefits through added capacity and improved connectivity.
SR 167 Completion Project Map
- Tolling SR 167
All lanes on the new portion of SR 167 will be tolled using two electronic toll points. There will be no tollbooths. Toll rates will be set by time of day – more during peak periods and less during mid-day, evenings and weekends. Toll rates for the new portion of SR 167 have not been determined. A toll authorization bill must be passed by the Legislature before tolling begins. $95 million from tolls will be used to construct the SR 167 Completion project. The Washington State Transportation Commission would then oversee the rate-setting process. The rate-setting process will begin closer to when the project is completed.
- Working with Sound Transit
WSDOT is working closely with Sound Transit on the Tacoma Dome Link Extension project as both agencies work to build new major infrastructure projects in the area.
- Riparian Restoration Program (RRP)
The RRP is a watershed strategy for stormwater management that will use an innovative approach to conventional flow control facilities. It will reduce flood levels, improve degraded stream and riparian corridor habitat, and provide benefits to fish and wildlife.
- Diverging Diamond Interchange (DDI)
Through this project, WSDOT will implement the state’s second Diverging Diamond Interchange. The DDI will function as an on and off ramp to I-5. The unique design will improve traffic safety by decreasing the amount of conflict points throughout the interchange.
- Single Point Urban Interchange (SPUI)
A single point urban Interchange, known as a SPUI, is planned to be constructed at the new interchange between SR 167 and SR 161. These interchanges are efficient and only utilize one traffic signal to control all the movements at the interchange.
SR 509 Completion Project Map
- Lake to Sound Trail Final Segment
The Puget Sound Gateway Program will help to fund a portion of the Lake to Sound Trail, a 16-mile non-motorized trail extending from Lake Washington to the Puget Sound shoreline. WSDOT is working in close coordination with the City of SeaTac and King County to finish the final segment of the trail. The SR 509 alignment will cross over
the trail near South 200th St. and South 189th St.
- Southern Access to Sea-Tac Airport
The SR 509 project design accommodates the Port of Seattle’s concept for a South Airport Expressway from SR 509 to Sea-Tac International Airport. Trips to the airport from the south will have a new access point to the airport, relieving the north access route. By creating this new southern access point, communities south of SeaTac would have improved access. An interim South Access will be provided from 28th/24th Avenue South.
- Early Work in SeaTac: Connecting
28th/24th Avenue South The City of SeaTac just completed a project, with funding support from WSDOT, to build a new road between South 200th and South 208th streets to connect 28th Avenue South to 24th Avenue South. The project completes the gap in the 28th/24th Avenue South corridor and provides an alternative to SR 99 in the area. As part of the project, a new bridge and tunnel were constructed that accommodates the future SR 509 corridor and the South Airport Expressway.
- Tolling SR 509
All lanes on the new portion of SR 509 will be tolled using one electronic toll point. There will be no tollbooths. Toll rates will be set by time of day – more during peak periods and less during mid-day, evenings and weekends. Toll rates for the new portion of SR 509 have not been determined. A toll authorization bill must be passed by the Legislature before tolling begins. $85 million from tolls will be used to construct the SR 509 Completion project. The Washington State Transportation Commission would then oversee the rate-setting process. The rate-setting process will begin closer to when the project is completed.
- Working with Sound Transit
WSDOT is working closely with Sound Transit as both agencies work to build new major infrastructure projects in the area. Coordination is underway to work through shared property
needs in the area. Both teams are also in close coordination at key locations where the projects interact with each other, including the SR 99 crossing, the South 216th St. Bridge, retaining walls near Mansion Hill Neighborhood, and the Southbound off ramp to SR 516.
