Windspeed
Humidity
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 |
Discharge | Stage | Elevation | |
LK ELEANOR DIV TO CHERRY LAKE NR HETCH HETCHY CA
2018-03-15T01:15:00.000-07:00 |
1cfs | ft | 4666ft |
GREEN CREEK NEAR BRIDGEPORT
2025-02-11T00:00:00.000-08:00 |
11cfs | 2.09ft | 6864ft |
ELEANOR C NR HETCH HETCHY CA
2025-02-11T00:15:00.000-08:00 |
169cfs | 11.81ft | 4531ft |
CHERRY C BL VALLEY DAM NR HETCH HETCHY CA
2025-02-11T00:15:00.000-08:00 |
6cfs | 5.11ft | 4355ft |
ROBINSON C AT TWIN LKS OUTLET NR BRIDGEPORT
2025-02-11T00:00:00.000-08:00 |
6cfs | 1.22ft | 7082ft |
BUCKEYE C NR BRIDGEPORT
2025-02-09T01:45:00.000-08:00 |
15cfs | 1.57ft | 6905ft |
TUOLUMNE R AB EARLY INTAKE NR MATHER CA
2025-02-11T00:15:00.000-08:00 |
91cfs | 12.57ft | 2443ft |