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What’s not included in Stage 2?

Stage 1a

The first stage of the SR 509 Completion Project built a new SR 99 bridge in SeaTac below the Link light rail elevated guideway and above the SR 509 roadway. The SR 99 bridge opened to traffic in July 2022.

Stage 1b

This stage of the SR 509 Completion Project, which is currently in progress, builds the first mile of new tolled expressway between I-5 and 24th Avenue South, new I-5 ramps, new interchanges, a tunnel under I-5 and a new South 216th Street bridge. Project photos and visualizations are available on our Flickr page  and the SR 509 Expressway interactive map.

The new South 216th Street bridge (at top of photo) and northbound I-5 to northbound SR 509
flyover ramp are being built as part of the SR 509 Stage 1b contract.

What is the Puget Sound Gateway Program?

The Puget Sound Gateway Program includes the SR 509 Completion Project in south King County and the SR 167 Completion Project in Pierce County. Together, these improvements will enhance the state’s economic competitiveness, both nationally and globally, connecting the state’s largest ports to key distribution centers in King and Pierce counties.

Map showing Puget Sound Gateway Program project areas