Peconom
Peconom is an earth dam located in Lassen County, California, built in 1920. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Peconom
The primary purpose of Peconom 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 John Fitzgerald (private). It impounds the Antelope Val.
The dam stands 15 feet tall and stretches 470 feet across, creates a reservoir covering 41 acres, has a maximum storage capacity of 173 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1920, the structure is over a century 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 06/18/2025.
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Location
| State | California |
| County | Lassen |
| River/Stream | Antelope Val |
| Coordinates | 40.44420, -120.60280 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 470 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 173 acre-ft |
| Max Storage | 173 acre-ft |
| Surface Area | 41 acres |
| Drainage Area | 9 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | John Fitzgerald |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/18/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00938 |
| Federal ID | CA00938 |
| More Info | State Dam Safety Program |