Big Dalton
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Los Angeles |
| Nearest City | Glendora |
| River/Stream | Big Dalton Wash |
| Coordinates | 34.17040, -117.80990 |
Physical Characteristics
| Dam Type | Multi-Arch |
| NID Height | 153 ft |
| Dam Height | 153 ft |
| Dam Length | 480 ft |
| Year Completed | 1929 (97 years old) |
Storage & Hydraulics
| NID Storage | 1,290 acre-ft |
| Max Storage | 1,290 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 4 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 | 12/02/2025 |
| Emergency Action Plan | Yes |