Ward Creek
Ward Creek is an earth dam located in Alameda County, California, built in 1963. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Ward Creek
The primary purpose of Ward Creek is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Alameda County Public Works Agency (local government). It impounds the Ward Creek near Hayward.
The dam stands 71 feet tall and stretches 190 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 130 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1963, the structure is well into its service life at over 50 years old.
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 09/30/2025.
At 71 feet, this dam is taller than 96% of all dams in the United States.
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 | Alameda |
| Nearest City | Hayward |
| River/Stream | Ward Creek |
| Coordinates | 37.66740, -122.06790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 71 ft |
| Dam Height | 71 ft |
| Dam Length | 190 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 130 acre-ft |
| Max Storage | 130 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Alameda County Public Works Agency |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/30/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00839 |
| Federal ID | CA00839 |
| More Info | State Dam Safety Program |