Hewitt Dam
Hewitt Dam is an earth dam located in Phillips County, Montana, built in 1938. It carries a Low hazard potential classification and has a poor condition assessment.
About Hewitt Dam
The primary purpose of Hewitt Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Us Fish And Wildlife Service (federal). It impounds the Hewitt Lake Coulee.
The dam stands 10 feet tall and stretches 1,180 feet across, creates a reservoir covering 459 acres, has a maximum storage capacity of 3,250 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1938, 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 09/23/2020.
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Location
| State | Montana |
| County | Phillips |
| River/Stream | Hewitt Lake Coulee |
| Coordinates | 48.54000, -107.58167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 1,180 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 3,250 acre-ft |
| Max Storage | 3,250 acre-ft |
| Normal Storage | 1,070 acre-ft |
| Surface Area | 459 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 6,240 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | US FISH AND WILDLIFE SERVICE |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/23/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00640 |
| Federal ID | MT00640 |
| More Info | State Dam Safety Program |