Rossmoor Retarding Basin
California — Orange County — Los Alamitos Channel
Location
| State | California |
| County | Orange |
| River | Los Alamitos Channel |
| Coordinates | 33.78770, -118.09140 |
Physical Characteristics
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 95 ft |
| NID Storage | 175 acre-ft |
| Max Storage | 175 acre-ft |
| Surface Area | 25 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Satisfactory |
| EAP Status | No |
| Last Inspection | September 17, 2025 |
| Inspection Frequency | 0.5 |
Dam Information
| Year Completed | 2002 |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | County of Orange |
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.