Cowan Reservoir
Cowan Reservoir is an earth dam located in Chouteau County, Montana, built in 1936. It carries a Low hazard potential classification.
About Cowan Reservoir
The primary purpose of Cowan Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Cowan & Son Inc (private). It impounds the Duck Creek near Box Elder.
The dam stands 20 feet tall and stretches 990 feet across, and has a maximum storage capacity of 211 acre-feet. Completed in 1936, 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.
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Location
| State | Montana |
| County | Chouteau |
| Nearest City | Box Elder |
| River/Stream | Duck Creek |
| Coordinates | 48.25680, -109.90360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 990 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 211 acre-ft |
| Max Storage | 211 acre-ft |
| Normal Storage | 89 acre-ft |
| Max Discharge | 120 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | COWAN & SON INC |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01574 |
| Federal ID | MT01574 |
| More Info | State Dam Safety Program |