Tarawa Retention Dam
Tarawa Retention Dam is a gravity dam located in Phillips County, Montana, built in 1947. It carries a Low hazard potential classification and has a poor condition assessment.
About Tarawa Retention Dam
The primary purpose of Tarawa Retention 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 Cottonwood Ck./milk River near Hinsdale.
The dam stands 22 feet tall and stretches 1,025 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 55 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1947, the structure is well-established, with more than 75 years of service.
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 09/01/2017.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Hinsdale |
| River/Stream | Cottonwood Ck./milk River |
| Coordinates | 48.72231, -108.04656 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 22 ft |
| Dam Length | 1,025 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| NID Storage | 55 acre-ft |
| Max Storage | 55 acre-ft |
| Normal Storage | 29 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/01/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03936 |
| Federal ID | MT03936 |
| More Info | State Dam Safety Program |