Mossyrock Dam

Mossyrock Dam, located in Silver Creek, Washington, stands as the state's tallest dam at 606 feet, providing clean renewable hydropower to over 87,000 homes annually. Completed in 1968, the dam features a double curvature concrete arch design and three penstocks that extend to a modern powerhouse, which was upgraded with efficient turbines in 2010 and 2011.

The dam created the 2.35-mile-long Riffe Lake, offering extensive recreational opportunities, including boating, fishing, and camping at nearby parks such as Mossyrock Park and Taidnapam Park. In light of seismic safety concerns, efforts are underway to maintain Riffe Lake at a lower elevation to mitigate risks, while assessments for potential seismic retrofits are ongoing.

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