Figure 0.1 · BRIEFING
BID #9424 · WSDOTRESULT · awarded Oct 8

SR 509, SR 509 Completion - Stage 1B

King County

Bid dateThursday, October 8—
read → connected → answeredcassandri

Project details

Description
The SR 509 Stage 1b is the first major stage of the SR 509 Completion Project, located in King County in the cities of Des Moines, Kent and SeaTac. WSDOT plans to complete construction of the SR 509 Completion Project in two major stages by 2028.When completed, the project will…

How to read this. Plan‑pull counts come straight from agency portals. Patterns and confidence scores are derived from comparable lettings (same county, same category, three‑year basis). Confidence is a calibration of past correctness on signals of this shape — not a guarantee of this bid’s outcome. We never round up. More on what Cassandri does →