I-90 - North Fork Issaquah Creek Fish Passage - Complete October 2017

WSDOT realigned North Fork Issaquah Creek near East Lake Sammamish Parkway. The creek was rerouted north to flow underneath East Lake Sammamish Parkway through a new box culvert. A second culvert was also built underneath the highway to give the local migratory trout and salmon additional access to a nearby offshoot of North Fork Issaquah Creek. This project opens up almost a mile of additional fish habitat.

Needs & benefits

Protects environment
Rerouting the creek through two box culverts and rebuilding the creek bed will restore North Forth Issaquah Creek to a more natural state and open up a mile of additional habitat to native and migratory fish. Before the project, water flows were occasionally too low or strong for fish to navigate upstream. The completion of this work also helps bring the state into compliance with a U.S. District Court ruling that mandates that the state must remove culverts that block fish passage under state highways.


Pre-Existing Funds (PEF): $6,000,000
Total: $6,000,000


Northwest Region Communications
15700 Dayton Ave. N.
Seattle, WA 98133