Zackuse Creek Restoration and Culvert Replacement Sammamish, Washington

With the potential to support a large kokanee spawning run, 450 linear feet of Zackuse Creek was identified to be reestablished and restored. The effort includes replacing an existing downstream culvert on East Lake Sammamish Parkway with a fish passable box structure.

Supporting Fish Spawning and Passage with a Restored Stream

Despite favorable fish features, an evaluation of Zackuse Creek revealed that spawning kokanee had been frequently observed in low numbers below the East Lake Sammamish Parkway barrier culvert. Over several decades, the lower reach of the creek experienced sediment deposition in an alluvial fan wetland from natural and developed conditions. The creek channel has migrated to converge on East Lake Sammamish Parkway SE, causing embankment failure and the introduction of roadside pollutants. This work included altering channel morphology to enhance the way the stream transports its sediment load as well as restoring, improving, and sustaining aquatic habitat.