Bonneau is a federal water resource located in Box Elder, Montana, managed by the Bureau of Indian Affairs for irrigation purposes.
Wind
Humidity
The dam, completed in 2005, stands at a height of 105 feet and has a length of 807 feet, providing a storage capacity of 4000 acre-feet on Boxelder Creek. The structure is a controlled spillway type, with a high hazard potential due to its location and function.
Despite its remote location, Bonneau has been subject to regular inspections every five years, with the last inspection conducted in September 2012. The dam has a very high risk assessment rating, emphasizing the importance of ongoing monitoring and maintenance to ensure its safety and reliability. While the condition assessment is currently not available, efforts have been made to prepare an Emergency Action Plan (EAP) to mitigate potential risks and protect downstream communities in the event of a dam failure. With its critical role in irrigation and recreation, Bonneau serves as a vital water resource in Chouteau County, Montana.
Year Completed |
2005 |
Dam Length |
807 |
River Or Stream |
BOXELDER CREEK |
Primary Dam Type |
Earth |
Nid Storage |
4000 |
Structural Height |
105 |
Hazard Potential |
High |
Nid Height |
105 |
Big Sandy Creek Near Havre Mt
|
6cfs |
Milk River At Havre Mt
|
42cfs |
Missouri River At Virgelle Mt
|
4290cfs |
Clear Creek Near Chinook Mt
|
21cfs |
Battle Creek Near Chinook Mt
|
12cfs |
Teton River At Loma Mt
|
30cfs |
| Location | Reservations | Toilets |
|---|---|---|
Beaver Creek County Park
|
||
Bearpaw Lake FAS
|
||
Hill County Beaver Creek Park
|