Half Barrel Detention Dam
Half Barrel Detention Dam is a gravity dam located in Valley County, Montana, built in 1956. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About Half Barrel Detention Dam
The primary purpose of Half Barrel 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 21 feet tall and stretches 1,255 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 43 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1956, 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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. The most recent inspection on record was 08/05/2009. That was over 16 years ago.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Nashua |
| River/Stream | Willow Ck./milk River |
| Coordinates | 47.86642, -106.98036 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 21 ft |
| Dam Length | 1,255 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 144 acre-ft |
| Max Storage | 43 acre-ft |
| Normal Storage | 144 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 1 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 | Unsatisfactory |
| Last Inspection | 08/05/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00685 |
| Federal ID | MT00685 |
| More Info | State Dam Safety Program |