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What to expect in 2026 and 2027

2026 project timeline

Chuckanut Creek – Milepost 246

Unnamed Tributary to Lake Creek – Milepost 246

Unnamed tributary to Lake Creek: Two new, larger culverts

Unnamed tributary to Lake Creek will have a single culvert that crosses under both directions of I-5 (milepost 246). The culvert will be built in two phases, using traffic configurations similar to what is done in 2025. The southbound I-5 on- and off-ramps to N Lake Samish Drive (Exit 246) will also be reconfigured and relocated as part of this work.

Chuckanut Creek: Three Bridges

Chuckanut Creek bridges will be built using a phased construction approach and bypass roads to divert traffic around the work areas. All three bridges will be built and opened to travelers in 2026. Stream restoration work will follow in 2027.

Old Samish Road closure – April 2026

A portion of Old Samish Road will close for up to seven months in order to construct the Chuckanut Creek bridge. Travelers will be provided a signed detour around the closure.

Map of 2026 project construction zones