John Ball Reservoir
Significant Hazard ConditionEmergency Action Plan: Not Required
Location
| State | Montana |
| County | McCone |
| Nearest City | NO TOWN |
| River/Stream | TR-SOUTH FORK ROCK CREEK |
| Coordinates | 47.72070, -106.13850 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 360 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 145 acre-ft |
| Max Storage | 145 acre-ft |
| Normal Storage | 61 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | LYLE E NELSON |
| Owner Type | Private |
| Hazard Classification | Significant |
| Emergency Action Plan | Not Required |