Script Detention Dam is a gravity dam located in Valley County, Montana, built in 1957. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 17 ft17 ft tall and 1,060 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 Script Detention Dam
The primary purpose of Script 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 17 feet tall and stretches 1,060 feet across, creates a reservoir covering 22 acres, and has a maximum storage capacity of 129 acre-feet. 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. 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 12/02/2019.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Willow Ck./milk River |
| Coordinates | 48.03761, -106.95890 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 17 ft |
| Dam Length | 1,060 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 129 acre-ft |
| Max Storage | 129 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 22 acres |
| 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 | 12/02/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00686 |
| Federal ID | MT00686 |
| More Info | State Dam Safety Program |