Onion Head
Low Hazard ConditionEmergency Action Plan: Not Required
Location
| State | Montana |
| County | Meagher |
| Nearest City | WHITE SULPHUR SPRINGS |
| River/Stream | TR-SOUTH FORK WOODS GULCH CR |
| Coordinates | 46.47300, -111.05500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 374 acre-ft |
| Max Storage | 374 acre-ft |
| Normal Storage | 239 acre-ft |
| Surface Area | 25 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | SPRINGDALE COLONY INC |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |