Mallard
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Contra Costa |
| Nearest City | Concord |
| River/Stream | Offstream |
| Coordinates | 38.01400, -122.03590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 11,000 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 3,113 acre-ft |
| Max Storage | 3,113 acre-ft |
| Surface Area | 213 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Contra Costa Water District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/27/2025 |
| Emergency Action Plan | Yes |