Collins Detention Reservoir is an earth dam located in Valley County, Montana, built in 1957. It carries a Low hazard potential classification.
Dam profile
NID height · 41 ft41 ft tall and 3,571 ft long, taller than 87% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Collins Detention Reservoir
The primary purpose of Collins Detention Reservoir is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Silver Dollar Grazing Assn (private). It impounds the Willow Creek near Nashua.
The dam stands 41 feet tall and stretches 3,571 feet across, has a maximum storage capacity of 1,700 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1957, 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.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Willow Creek |
| Coordinates | 47.90070, -106.89020 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 27 ft |
| Dam Length | 3,571 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 1,700 acre-ft |
| Max Storage | 1,700 acre-ft |
| Normal Storage | 1,350 acre-ft |
| Drainage Area | 13 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Silver Dollar Grazing Assn |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00731 |
| Federal ID | MT00731 |
| More Info | State Dam Safety Program |