Mammoth Pool, a privately owned dam located in Big Creek, California, serves as a key hydroelectric facility along the San Joaquin River. Built in 1960 by Bechtel, the earth dam stands at a height of 411 feet and has a storage capacity of 122,175 acre-feet. The dam's primary purpose is hydroelectric generation, but it also offers recreational activities on its 1,100-acre surface area.

With a high hazard potential and a moderate risk assessment, Mammoth Pool is regulated and inspected by both state and federal agencies to ensure its safety and compliance with regulations. The dam features an uncontrolled spillway with a width of 403 feet and can discharge up to 235,000 cubic feet per second. Despite its age, Mammoth Pool continues to be a vital water resource and energy provider in the region, contributing to the sustainable development of California's water and energy infrastructure.