Cogswell
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Los Angeles |
| Nearest City | Azusa |
| River/Stream | Wfk San Gabriel R |
| Coordinates | 34.24410, -117.96490 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 266 ft |
| Dam Height | 266 ft |
| Dam Length | 585 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 8,969 acre-ft |
| Max Storage | 8,969 acre-ft |
| Surface Area | 146 acres |
| Drainage Area | 38 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 | 10/15/2025 |
| Emergency Action Plan | Yes |