Mallard
Mallard is an earth dam located in Contra Costa County, California, built in 1930. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Mallard
The primary purpose of Mallard is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Contra Costa Water District (public utility). It impounds the Offstream near Concord.
The dam stands 30 feet tall and stretches 11,000 feet across, creates a reservoir covering 213 acres, and has a maximum storage capacity of 3,113 acre-feet. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 02/27/2025.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| 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 |
Identifiers
| NID ID | CA00838 |
| Federal ID | CA00838 |
| More Info | State Dam Safety Program |