Jack's Swamp Dam No. 2
Jack's Swamp Dam No. 2 is an earth dam located in Modoc County, California, built in 1926. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Jack's Swamp Dam No. 2
The primary purpose of Jack's Swamp Dam No. 2 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 Glenn Nader (private). It impounds the Tr Pit River.
The dam stands 12 feet tall and stretches 300 feet across, creates a reservoir covering 457 acres, has a maximum storage capacity of 1,013 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1926, the structure is well-established, with more than 75 years of service.
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 | Modoc |
| River/Stream | Tr Pit River |
| Coordinates | 41.54810, -120.81650 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 300 ft |
| Year Completed | 1926 (100 years old) |
Storage & Hydraulics
| NID Storage | 1,013 acre-ft |
| Max Storage | 1,013 acre-ft |
| Surface Area | 457 acres |
| Drainage Area | 7 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Glenn Nader |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/18/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01425 |
| Federal ID | CA01425 |
| More Info | State Dam Safety Program |