Butt Valley is a reservoir located in Plumas County, California. The lake was created in 1921 when the Butt Valley Dam was built on the North Fork Feather River. The hydrology of the area is controlled by the dam, which is managed by the Pacific Gas and Electric Company. The North Fork Feather River, as well as several smaller streams, provide surface flow to the reservoir. The area receives significant snowfall during the winter months, with snowpack from the surrounding mountains contributing to the water supply. Agriculture is not a significant industry in the area, but the lake is a popular destination for recreational activities such as fishing, boating, and camping.