RESERVOIR LEVELS
February 11, 2025


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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.

Storage 24hr Change -0.79%
Percent of Normal 95%
Minimum 10,916 acre-ft
2021-10-05
Maximum 128,184 acre-ft
2023-06-06
Average 109,211 acre-ft
Dam_Height 411
Hydraulic_Height 330
Drainage_Area 995
Year_Completed 1960
Nid_Storage 122175
River_Or_Stream San Joaquin River
Structural_Height 411
Foundations Rock
Surface_Area 1100
Hazard_Potential High
Dam_Length 820
Primary_Dam_Type Earth
Nid_Height 411
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