Sportsman is an earth dam located in Fallon County, Montana, built in 1955. It carries a Significant hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 600 ft long, taller than 62% 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 Sportsman
The primary purpose of Sportsman is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Randal Hanson (private). It impounds the Tr-dry Duck near Marmarth North Dakota.
The dam stands 28 feet tall and stretches 600 feet across, and has a maximum storage capacity of 296 acre-feet. Completed in 1955, the structure is well into its service life at over 50 years old.
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 | Fallon |
| Nearest City | Marmarth North Dakota |
| River/Stream | Tr-dry Duck |
| Coordinates | 46.16650, -104.39290 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 600 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 296 acre-ft |
| Max Storage | 296 acre-ft |
| Normal Storage | 125 acre-ft |
Ownership & Safety
| Purpose | Recreation |
| Owner | Randal Hanson |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01042 |
| Federal ID | MT01042 |
| More Info | State Dam Safety Program |