San Marcos
California — San Luis Obispo County — San Marcos Creek
Location
| State | California |
| County | San Luis Obispo |
| River | San Marcos Creek |
| Coordinates | 35.67400, -120.81300 |
Physical Characteristics
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 502 ft |
| NID Storage | 325 acre-ft |
| Max Storage | 325 acre-ft |
| Surface Area | 29 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | May 21, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1964 |
| Primary Purpose | Other |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | Harry E. Blythe Jr. |
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.