Ruth Lake Dam, also known as the Temporary Sewage Lagoon, is a Federal-owned structure located in Kitsap, Washington. Constructed in 1977 by the US Navy, this Earth-type dam stands at a height of 18 feet and has a hydraulic height of 4.5 feet, with a length of 300 feet. The dam serves as a water resource management facility for the Hood Canal-Offstream area, providing a storage capacity of 135 acre-feet and a surface area of 9.9 acres.

Managed and funded by the US Navy, Ruth Lake Dam is inspected regularly by the same agency to ensure its structural integrity and compliance with state regulations. While the dam has a low hazard potential, its condition assessment in 2018 was rated as fair. In case of emergencies, the dam has a moderate risk level, with risk management measures in place to address potential issues.

Despite its primary purpose being categorized as "Other", Ruth Lake Dam plays a crucial role in water resource management and climate resilience in the region. With its relatively low hazard potential and moderate risk assessment, the dam continues to serve as a key infrastructure owned and operated by the US Navy for the benefit of the surrounding community and environment.