Nine Springs
Nine Springs is an earth dam located in Lassen County, California, built in 1954. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Nine Springs
The primary purpose of Nine Springs 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 Dan Tankersley (private). It impounds the Tr Bull Run Slough.
The dam stands 16 feet tall and stretches 3,600 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 125 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1954, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/05/2025.
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Location
| State | California |
| County | Lassen |
| River/Stream | Tr Bull Run Slough |
| Coordinates | 41.12240, -121.20814 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 3,600 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Dan Tankersley |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/05/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00951 |
| Federal ID | CA00951 |
| More Info | State Dam Safety Program |