Onion Head
Onion Head is an earth dam located in Meagher County, Montana, built in 1955. It carries a Low hazard potential classification.
About Onion Head
The primary purpose of Onion Head is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Springdale Colony Inc (private). It impounds the Tr-south Fork Woods Gulch Cr near White Sulphur Springs.
The dam stands 29 feet tall and stretches 1,300 feet across, creates a reservoir covering 25 acres, and has a maximum storage capacity of 374 acre-feet. Completed in 1955, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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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 |
Identifiers
| NID ID | MT03671 |
| Federal ID | MT03671 |
| More Info | State Dam Safety Program |