Rattlesnake Reservoir
Rattlesnake Reservoir is an earth dam located in Yellowstone County, Montana, built in 1909. It carries a Low hazard potential classification.
About Rattlesnake Reservoir
The primary purpose of Rattlesnake Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Billings Bench Water Ass'n (private). It impounds the Twelvemile Creek-offstream near Huntley.
The dam stands 14 feet tall and stretches 4,752 feet across, creates a reservoir covering 179 acres, and has a maximum storage capacity of 715 acre-feet. Completed in 1909, the structure is over a century 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 | Yellowstone |
| Nearest City | Huntley |
| River/Stream | Twelvemile Creek-offstream |
| Coordinates | 45.89620, -108.42470 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 4,752 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 715 acre-ft |
| Max Storage | 715 acre-ft |
| Normal Storage | 715 acre-ft |
| Surface Area | 179 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BILLINGS BENCH WATER ASS'N |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02427 |
| Federal ID | MT02427 |
| More Info | State Dam Safety Program |