Antioch Reservoir
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Contra Costa |
| River/Stream | Tr San Joaquin Riv |
| Coordinates | 37.97790, -121.80900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 450 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 722 acre-ft |
| Max Storage | 722 acre-ft |
| Surface Area | 61 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Antioch |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/17/2024 |
| Emergency Action Plan | Yes |