Mountain Ben is an earth dam located in Powell County, Montana, built in 1920. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 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 Mountain Ben
The primary purpose of Mountain Ben is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Tamcke Brothers (private). It impounds the Dempsey Creek near Deer Lodge.
The dam stands 9 feet tall and stretches 125 feet across, and has a maximum storage capacity of 77 acre-feet. Completed in 1920, the structure is over a century 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 | Powell |
| Nearest City | Deer Lodge |
| River/Stream | Dempsey Creek |
| Coordinates | 46.33320, -113.02364 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 125 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 77 acre-ft |
| Max Storage | 77 acre-ft |
| Normal Storage | 45 acre-ft |
| Max Discharge | 60 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Tamcke Brothers |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01139 |
| Federal ID | MT01139 |
| More Info | State Dam Safety Program |