Forrest Detention Dam
Forrest Detention Dam is a gravity dam located in Valley County, Montana, built in 1957. It carries a Low hazard potential classification and has a poor condition assessment.
About Forrest Detention Dam
The primary purpose of Forrest 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 20 feet tall and stretches 2,951 feet across, creates a reservoir covering 117 acres, has a maximum storage capacity of 808 acre-feet, and collects water from a drainage area of 90 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. 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 | 47.89171, -106.95293 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 20 ft |
| Dam Length | 2,951 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 808 acre-ft |
| Max Storage | 808 acre-ft |
| Surface Area | 117 acres |
| Drainage Area | 90 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 | Poor |
| Last Inspection | 12/02/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00713 |
| Federal ID | MT00713 |
| More Info | State Dam Safety Program |