Bar Island Detention Dam
Bar Island Detention Dam is a gravity dam located in Phillips County, Montana, built in 1967. It carries a Low hazard potential classification and has a poor condition assessment.
About Bar Island Detention Dam
The primary purpose of Bar Island Detention Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Doi Blm (federal). It impounds the Rock Ck./missouri River near Fort Peck.
The dam stands 44 feet tall and stretches 597 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 484 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1967, 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 08/15/2016.
At 44 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Fort Peck |
| River/Stream | Rock Ck./missouri River |
| Coordinates | 47.74386, -108.57575 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 44 ft |
| Dam Length | 597 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 484 acre-ft |
| Max Storage | 484 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 13 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/15/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03923 |
| Federal ID | MT03923 |
| More Info | State Dam Safety Program |