San Dimas
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Los Angeles |
| Nearest City | San Dimas |
| River/Stream | San Dimas Creek |
| Coordinates | 34.15430, -117.77320 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 131 ft |
| Dam Height | 131 ft |
| Dam Length | 340 ft |
| Year Completed | 1922 (104 years old) |
Storage & Hydraulics
| NID Storage | 1,534 acre-ft |
| Max Storage | 1,534 acre-ft |
| Surface Area | 36 acres |
| Drainage Area | 15 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Los Angeles County Department Of Public Works |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/18/2025 |
| Emergency Action Plan | Yes |