Mallard is an earth dam located in Corson County, South Dakota, built in 1935. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 670 ft long, taller than 50% 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 Mallard
The primary purpose of Mallard is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by S&pl (state). It impounds the Tr-hump near Bullhead.
The dam stands 25 feet tall and stretches 670 feet across, creates a reservoir covering 46 acres, has a maximum storage capacity of 859 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1935, 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 11/08/2018.
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Location
| State | South Dakota |
| County | Corson |
| Nearest City | Bullhead |
| River/Stream | Tr-hump |
| Coordinates | 45.89130, -101.48995 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 670 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 859 acre-ft |
| Max Storage | 859 acre-ft |
| Normal Storage | 371 acre-ft |
| Surface Area | 46 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 3,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/08/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00737 |
| Federal ID | SD00737 |
| More Info | State Dam Safety Program |