Thompson Creek
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Los Angeles |
| Nearest City | Claremont, CA |
| River/Stream | Thompson Creek |
| Coordinates | 34.14070, -117.71380 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 66 ft |
| Dam Height | 66 ft |
| Dam Length | 1,500 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 543 acre-ft |
| Max Storage | 543 acre-ft |
| Surface Area | 345 acres |
| Drainage Area | 3 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 | 10/22/2025 |
| Emergency Action Plan | Yes |