I-5 / 4th ST and 88th ST NE Corridor Improvements Project
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Closes
Aug 10, 2026
The project constructs seven roundabouts replacing signalized intersections along both corridors. The project also construct a new bridge over Coho Creek on 88th Street NE (replacing an existing culvert), new and replaced retaining walls, new stormwater treatment and conveyance systems, enhancements to Coho Creek and surrounding critical areas, landscaping, illumination, permanent signing, ITS, and other work.