Tumwater Canyon/State Route 2 Riverbank Stabilization

Client: Washington Department of Transportation (WSDOT)

Location: Washington

Summary: Cardno ENTRIX scientists and engineers evaluated the causal mechanisms of chronic highway failure along State Route 2 in Tumwater Canyon of the Wenatchee River, west of Leavenworth, WA. Cardno ENTRIX evaluated hydraulic conditions downstream of the dam to assess how the dam?s spillway may be impacting the highway embankment. In addition to a geomorphic and hydraulic analysis, Cardno ENTRIX worked with stakeholders regarding fisheries issues, particularly in consideration of potential modifications of the dam. The Wenatchee Watershed is a premier system for wild salmon and Bull Trout. The Cardno ENTRIX team developed a set of alternatives to provide long-term, environmentally sensitive, sustainable protection for the highway.