Folsom Lake is a major reservoir impounded by which dam?

Folsom Lake is a crucial reservoir in California, primarily created by the construction of Folsom Dam. This dam, located on the American River, was built for water storage, flood control, and hydroelectric power generation. Folsom Dam plays a significant role in managing water resources for the surrounding areas and supports various recreational activities at Folsom Lake.

The other dams mentioned, while important in their own rights, do not impound Folsom Lake. Lakeside Dam and Castaic Dam serve other local water management needs, while Friant Dam is associated with the Friant-Kern Canal and the San Joaquin River system. Therefore, identifying Folsom Dam as the dam responsible for impounding Folsom Lake highlights its critical role in California's water infrastructure.