Jappe is an earth dam located in Chouteau County, Montana, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 600 ft long, taller than 82% of U.S. dams with a recorded height. 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 Jappe
The primary purpose of Jappe is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Henry J Drga (private). It impounds the Eightmile Coulee near No Town.
The dam stands 36 feet tall and stretches 600 feet across, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1956, 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.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Montana |
| County | Chouteau |
| Nearest City | No Town |
| River/Stream | Eightmile Coulee |
| Coordinates | 47.77420, -109.77200 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 600 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 445 acre-ft |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,050 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Henry J Drga |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00214 |
| Federal ID | MT00214 |
| More Info | State Dam Safety Program |