Mathew James #1 is an earth dam located in Powder River County, Montana, built in 1949. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 500 ft long, taller than 55% 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 Mathew James #1
The primary purpose of Mathew James #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Keith/sharlene Groh (private). It impounds the Gyp Creek near Poplar.
The dam stands 26 feet tall and stretches 500 feet across, has a maximum storage capacity of 263 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1949, 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 | Powder River |
| Nearest City | Poplar |
| River/Stream | Gyp Creek |
| Coordinates | 45.44700, -105.51850 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 500 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 263 acre-ft |
| Max Storage | 263 acre-ft |
| Normal Storage | 139 acre-ft |
| Drainage Area | 5 sq mi |
| Max Discharge | 160 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Keith/sharlene Groh |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02479 |
| Federal ID | MT02479 |
| More Info | State Dam Safety Program |