Deep Cut Detention Dam is a gravity dam located in Valley County, Montana, built in 1960. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 949 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Deep Cut Detention Dam
The primary purpose of Deep Cut Detention Dam 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 Doi BLM (federal). It impounds the Willow Ck./milk River near Nashua.
The dam stands 22 feet tall and stretches 949 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 168 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1960, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 11/02/2019.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Willow Ck./milk River |
| Coordinates | 48.08263, -106.79480 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 22 ft |
| Dam Length | 949 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 343 acre-ft |
| Max Storage | 168 acre-ft |
| Normal Storage | 343 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 11/02/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00671 |
| Federal ID | MT00671 |
| More Info | State Dam Safety Program |