South Beaver Detention Dam
South Beaver Detention Dam is a gravity dam located in Valley County, Montana, built in 1957. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About South Beaver Detention Dam
The primary purpose of South Beaver 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 24 feet tall and stretches 2,288 feet across, creates a reservoir covering 186 acres, has a maximum storage capacity of 1,109 acre-feet, and collects water from a drainage area of 6 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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. 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 | 48.02252, -106.95658 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 24 ft |
| Dam Length | 2,288 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 1,109 acre-ft |
| Max Storage | 1,109 acre-ft |
| Normal Storage | 659 acre-ft |
| Surface Area | 186 acres |
| Drainage Area | 6 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 | 12/02/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00687 |
| Federal ID | MT00687 |
| More Info | State Dam Safety Program |