Big John M
Low Hazard ConditionEmergency Action Plan: Not Required
Location
| State | Montana |
| County | Fergus |
| Nearest City | CHRISTINA |
| River/Stream | TR-EAST FORK ARMELLS CREEK |
| Coordinates | 47.28790, -109.21700 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 210 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 1,003 acre-ft |
| Max Storage | 1,003 acre-ft |
| Normal Storage | 281 acre-ft |
| Drainage Area | 0 sq mi |
| Max Discharge | 2,250 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CJ/MARALYN MONTGOMERY |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |