Mammoth Pool

Madera County, California (near Big Creek)

River/Stream: San Joaquin River

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Earth
Height
411 ft
Dam Length
820 ft
Reservoir Storage
122,175 acre-ft
Year Completed
1960
Primary Purpose
Hydroelectric
Owner Type
Private
Max Discharge
235,000 cfs

Condition Assessment

SatisfactoryLast inspected: 2023-08-29

Hazard Classification: High — This describes the potential consequences of dam failure, not the likelihood of failure.

Condition Assessment: Satisfactory — This describes the current physical condition of the dam based on the most recent inspection.

Location

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Quick Stats

NID ID
CA00443
State
California (CA)
Coordinates
37.32310, -119.31720
Age
66 years

Nearby Dams

External Resources

Data sourced from the National Inventory of Dams (NID). Information may not reflect the most current status of this dam. Hazard classification reflects potential consequences of failure, not the likelihood of failure or the current condition.