Marty Mission is an earth dam located in Charles Mix County, South Dakota, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 65 ft65 ft tall and 750 ft long, taller than 96% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Marty Mission
The primary purpose of Marty Mission is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by S&pl (state). It impounds the Seven Mile Creek near None in Flood Plain.
The dam stands 65 feet tall and stretches 750 feet across, and has a maximum storage capacity of 86 acre-feet. Completed in 1938, 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. The most recent inspection on record was 08/19/2020.
At 65 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | South Dakota |
| County | Charles Mix |
| Nearest City | None in Flood Plain |
| River/Stream | Seven Mile Creek |
| Coordinates | 43.04015, -98.46996 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 65 ft |
| Dam Height | 65 ft |
| Dam Length | 750 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Max Discharge | 1,450 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/19/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00223 |
| Federal ID | SD00223 |
| More Info | State Dam Safety Program |