Ingals Swamp
Ingals Swamp is an earth dam located in Modoc County, California, built in 1918. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Ingals Swamp
The primary purpose of Ingals Swamp 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 Lazy Spade, Llc (private). It impounds the Ingals Swamp.
The dam stands 23 feet tall and stretches 2,200 feet across, creates a reservoir covering 262 acres, has a maximum storage capacity of 2,850 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1918, 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 05/06/2025.
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Location
| State | California |
| County | Modoc |
| River/Stream | Ingals Swamp |
| Coordinates | 41.70780, -120.68480 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 2,200 ft |
| Year Completed | 1918 (108 years old) |
Storage & Hydraulics
| NID Storage | 2,850 acre-ft |
| Max Storage | 2,850 acre-ft |
| Surface Area | 262 acres |
| Drainage Area | 9 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lazy Spade, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/06/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00474 |
| Federal ID | CA00474 |
| More Info | State Dam Safety Program |