Silver Lake Watershed Project

Silver Lake Dam, a PL-566 structure located in southwest Washington, failed in May 1999. The 348 feet long concrete drop spillway structure had been undermined by piping of the foundation soils creating a void which extended approximately 125 feet along the long axis of the structure and 10 feet below the structure floor. The Multi-State Design Team (MSDT) conducted an engineering investigation of the dam failure and provided technical assistance for design of the repair work, which was completed in October of 1999 at a cost of $880,000. Items of work included underwater concrete placement, compaction and slurry grouting, sheet pile installation, epoxy corrosion protection, earthwork and rock riprap placement.

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