Big Creek, also known as Pine Mountain Lake, is a privately owned dam located in Jamestown, California. Completed in 1969, this earth-type dam stands at a height of 120 feet with a storage capacity of 7650 acre-feet. Its primary purpose is water supply, serving both recreational and water supply needs in the region.

Managed by the California Department of Water Resources and Safety of Dams, Big Creek is regulated, permitted, inspected, and enforced to ensure its safety and compliance with state regulations. With a hazard potential rated as high, the dam's condition assessment as of September 2017 was deemed satisfactory. Its last inspection in November 2020 indicated a need for regular monitoring and maintenance to mitigate any potential risks.

Situated in Tuolumne County, Big Creek spans an area of 200 acres and has a drainage area of 25.6 square miles. The dam's maximum discharge and spillway information were not provided, but its hydraulic height is recorded at 110 feet. With its strategic location and vital role in water supply, Big Creek is a crucial infrastructure that requires ongoing attention and management to ensure the safety and sustainability of the surrounding ecosystem and community.