Heapby Reservoir
Heapby Reservoir is an earth dam located in Deer Lodge County, Montana, built in 1958. It carries a Low hazard potential classification.
About Heapby Reservoir
The primary purpose of Heapby Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Donald W Beck (private). It impounds the Modesty Creek near Dempsey.
The dam stands 15 feet tall and stretches 750 feet across, has a maximum storage capacity of 62 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1958, the structure is well into its service life at over 50 years old.
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 | Deer Lodge |
| Nearest City | Dempsey |
| River/Stream | Modesty Creek |
| Coordinates | 46.23385, -112.81979 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 750 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Normal Storage | 32 acre-ft |
| Drainage Area | 16 sq mi |
| Max Discharge | 400 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | DONALD W BECK |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01375 |
| Federal ID | MT01375 |
| More Info | State Dam Safety Program |