Regulating Basin West Dam, also known as Tolt Dam, serves as a critical water supply structure in King County, Washington. Built in 1962 by Carey & Kramer Consulting Engineers, this earth dam stands at a height of 32 feet and has a storage capacity of 882 acre-feet. The primary purpose of the dam is to provide water supply, with secondary purposes including hydroelectric power generation.

Located on the North & South Fork Tolt River, this dam falls under the jurisdiction of the Federal Energy Regulatory Commission (FERC) and is operated by the local government. Despite its high hazard potential, with a moderate risk assessment rating, the dam has not undergone recent condition assessments. Emergency action plans are in place, although there is room for improvement in meeting guidelines and preparedness for potential risks.

Enthusiasts of water resources and climate in the region would find Regulating Basin West Dam to be a fascinating structure with a significant impact on the surrounding ecosystem. With its crucial role in water supply and potential for hydroelectric power generation, the dam represents a balance between resource management and environmental conservation. Monitoring and maintenance efforts are essential to ensure the safety and sustainability of this vital infrastructure in the face of changing climate patterns and water resource demands.