Poison Springs
Poison Springs is an earth dam located in Modoc County, California, built in 1957. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Poison Springs
Poison Springs is a dam in Modoc, California. The dam is owned by Fee Ranch, Inc. And P.h. Peterson (private). It impounds the Rock Creek.
The dam stands 43 feet tall and stretches 1,000 feet across, creates a reservoir covering 493 acres, has a maximum storage capacity of 7,120 acre-feet, and collects water from a drainage area of 48 square miles. Completed in 1957, 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 09/09/2025.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | California |
| County | Modoc |
| River/Stream | Rock Creek |
| Coordinates | 41.81880, -120.02670 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 43 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 7,120 acre-ft |
| Max Storage | 7,120 acre-ft |
| Surface Area | 493 acres |
| Drainage Area | 48 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Fee Ranch, Inc. and P.H. Peterson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/09/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00916 |
| Federal ID | CA00916 |
| More Info | State Dam Safety Program |