Eureka
Eureka is an earth dam located in Plumas County, California, built in 1866. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Eureka
The primary purpose of Eureka 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 California Department Of Parks And Recreation (state). It impounds the Eureka Creek.
The dam stands 29 feet tall and stretches 410 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 220 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1866, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. 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 08/14/2025.
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Location
| State | California |
| County | Plumas |
| River/Stream | Eureka Creek |
| Coordinates | 39.76360, -120.71300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 410 ft |
| Year Completed | 1866 (160 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | California Department of Parks and Recreation |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/14/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00031 |
| Federal ID | CA00031 |
| More Info | State Dam Safety Program |