Figure 0.1 · BRIEFING
BID #009905 · WSDOTRESULT · awarded Oct 6

SR 509, 24th Avenue South to South 188th Street – New Expressway

King County

Bid dateFriday, October 6—
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Project details

Description
WSDOT will build the remaining two miles of new SR 509 Expressway, reconfigure SR 509 interchanges at South 188th and South 160th Streets and add a southbound auxiliary lane on I-5 between SR 516 and South 272nd Street.

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 →