Del Valle
High HazardFair ConditionEmergency Action Plan: Yes
Location
| County | Alameda |
| Nearest City | Livermore |
| River/Stream | Arroyo Valle |
| Coordinates | 37.61570, -121.74500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 222 ft |
| Dam Height | 222 ft |
| Dam Length | 880 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 77,100 acre-ft |
| Max Storage | 77,100 acre-ft |
| Surface Area | 710 acres |
| Drainage Area | 146 sq mi |
| Max Discharge | 47,000 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | California Department of Water Resources |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 11/03/2025 |
| Emergency Action Plan | Yes |