Null Dam
Null Dam is an earth dam located in Shasta County, California, built in 1954. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Null Dam
The primary purpose of Null Dam 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 Sierra Pacific Industries (private). It impounds the Rock Creek.
The dam stands 54 feet tall and stretches 400 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 188 acre-feet, and collects water from a drainage area of 15 square miles. Completed in 1954, the structure is well into its service life at over 50 years old.
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 07/23/2025.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | California |
| County | Shasta |
| River/Stream | Rock Creek |
| Coordinates | 40.45400, -121.77030 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 54 ft |
| Dam Length | 400 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 188 acre-ft |
| Max Storage | 188 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 15 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Sierra Pacific Industries |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/23/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00933 |
| Federal ID | CA00933 |
| More Info | State Dam Safety Program |