Lake O'Neill Dam

San Diego County, California (near 22 AREA -CHAPPO)

River/Stream: SANTA MARGARITA RIV OFFSTREAM

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Earth
Height
17 ft
Dam Length
1,500 ft
Reservoir Storage
1,395 acre-ft
Year Completed
1883
Primary Purpose
Fire Protection, Stock, Or Small Fish Pond
Owner Type
Federal
Max Discharge
800 cfs

Condition Assessment

FairLast inspected: 2017-06-23

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

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

Location

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Quick Stats

NID ID
CA10131
State
California (CA)
Coordinates
33.32700, -117.32700
Age
143 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.