Big Johnson
California — Modoc County — Tr Lost River
Location
| State | California |
| County | Modoc |
| River | Tr Lost River |
| Coordinates | 41.94580, -121.21960 |
Physical Characteristics
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 1,900 ft |
| NID Storage | 410 acre-ft |
| Max Storage | 410 acre-ft |
| Surface Area | 65 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Satisfactory |
| EAP Status | No |
| Last Inspection | May 29, 2025 |
| Inspection Frequency | 0.5 |
Dam Information
| Year Completed | 1959 |
| Primary Purpose | Water Supply |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | Stanley Johnson |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.