Big John M
Montana — Fergus County
Location
| State | Montana |
| County | Fergus |
| Coordinates | 47.28790, -109.21700 |
Physical Characteristics
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 210 ft |
| NID Storage | 1,003 acre-ft |
| Max Storage | 1,003 acre-ft |
| Surface Area | — |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | — |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | — |
Dam Information
| Year Completed | 1972 |
| Primary Purpose | Irrigation |
| Dam Type | — |
| Owner Type | — |
| Owner | CJ/MARALYN MONTGOMERY |
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.