Lake Mission Viejo
High HazardPoor ConditionEmergency Action Plan: Yes
Location
| County | Orange |
| Nearest City | Mission Viejo |
| River/Stream | Oso Creek |
| Coordinates | 33.62710, -117.64920 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 123 ft |
| Dam Height | 123 ft |
| Dam Length | 1,750 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 4,300 acre-ft |
| Max Storage | 4,300 acre-ft |
| Surface Area | 150 acres |
| Drainage Area | 3 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lake Mission Viejo Association, Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 04/16/2025 |
| Emergency Action Plan | Yes |