Mardis Barry
Mardis Barry is an earth dam located in Lassen County, California, built in 1941. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Mardis Barry
The primary purpose of Mardis Barry 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 City Of Susanville (local government). It impounds the Tr Susan River.
The dam stands 14 feet tall and stretches 600 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 113 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1941, 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 | Lassen |
| River/Stream | Tr Susan River |
| Coordinates | 40.41960, -120.63400 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 600 ft |
| Year Completed | 1941 (85 years old) |
Storage & Hydraulics
| NID Storage | 113 acre-ft |
| Max Storage | 113 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 3 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Susanville |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/18/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00939 |
| Federal ID | CA00939 |
| More Info | State Dam Safety Program |