Lake O'Neill Dam
California — San Diego County — SANTA MARGARITA RIV OFFSTREAM
Location
| State | California |
| County | San Diego |
| River | SANTA MARGARITA RIV OFFSTREAM |
| Coordinates | 33.32700, -117.32700 |
Physical Characteristics
| NID Height | 17 ft |
| Dam Height | 14 ft |
| Dam Length | 1,500 ft |
| NID Storage | 1,395 acre-ft |
| Max Storage | 1,395 acre-ft |
| Surface Area | 116 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Fair |
| EAP Status | Yes |
| Last Inspection | June 23, 2017 |
| Inspection Frequency | 3 |
Dam Information
| Year Completed | 1883 |
| Primary Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Dam Type | Earth |
| Owner Type | Federal |
| Owner | DOD USMC |
| Other Name | Lake O'Neill |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.