SR 99, Alaskan Way Viaduct - SR 99 Bored Tunnel Design-Build Project

King County

Bid dateThursday, October 28—

Project details

Description: The SR 99 Bored Tunnel Design-Build Project is intended to expedite the construction of an alternate 4 lane tunnel facility as part of an integrated program consisting of a number of projects to replace the Alaskan Way Viaduct Program.

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 →