Sand Rock is an earth dam located in Carter County, Montana, built in 1937. It carries a Significant hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 200 ft long, taller than 59% 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 Sand Rock
The primary purpose of Sand Rock 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 Carl Logar (private). It impounds the South Fork Coal Bank Creek near Marmarth North Dakota.
The dam stands 27 feet tall and stretches 200 feet across, and has a maximum storage capacity of 1,470 acre-feet. Completed in 1937, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | Montana |
| County | Carter |
| Nearest City | Marmarth North Dakota |
| River/Stream | South Fork Coal Bank Creek |
| Coordinates | 45.93360, -104.21350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 200 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 1,470 acre-ft |
| Max Storage | 1,470 acre-ft |
| Normal Storage | 581 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Carl Logar |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02766 |
| Federal ID | MT02766 |
| More Info | State Dam Safety Program |