Groh #1 is an earth dam located in McCone County, Montana, built in 1954. It carries a Low hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 350 ft long, taller than 80% 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 Groh #1
The primary purpose of Groh #1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by James Groh (private). It impounds the Tr-horse Creek near Circle.
The dam stands 35 feet tall and stretches 350 feet across, has a maximum storage capacity of 53 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1954, 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 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Montana |
| County | McCone |
| Nearest City | Circle |
| River/Stream | Tr-horse Creek |
| Coordinates | 47.43990, -105.66940 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 350 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 14 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | James Groh |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02492 |
| Federal ID | MT02492 |
| More Info | State Dam Safety Program |