Lake Thibadeau Diversion Dam is an earth dam located in Hill County, Montana, built in 1938. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 18 ft18 ft tall and 1,125 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Lake Thibadeau Diversion Dam
The primary purpose of Lake Thibadeau Diversion 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 Lohman Coulee.
The dam stands 18 feet tall and stretches 1,125 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 566 acre-feet, and collects water from a drainage area of 75 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/23/2020.
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Location
| State | Montana |
| County | Hill |
| River/Stream | Lohman Coulee |
| Coordinates | 48.77833, -109.61833 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 1,125 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 566 acre-ft |
| Max Storage | 566 acre-ft |
| Normal Storage | 153 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 75 sq mi |
| Max Discharge | 3,676 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 | Satisfactory |
| Last Inspection | 09/23/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00631 |
| Federal ID | MT00631 |
| More Info | State Dam Safety Program |