East Vermillion is an earth dam located in McCook County, South Dakota, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 41 ft41 ft tall and 1,489 ft long, taller than 87% 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 East Vermillion
The primary purpose of East Vermillion 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 Gf&p (state). It impounds the E Fork Vermillion River near Davis.
The dam stands 41 feet tall and stretches 1,489 feet across, creates a reservoir covering 294 acres, has a maximum storage capacity of 17,400 acre-feet, and collects water from a drainage area of 402 square miles. Completed in 1958, 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. The most recent inspection on record was 11/14/2019.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | South Dakota |
| County | McCook |
| Nearest City | Davis |
| River/Stream | E Fork Vermillion River |
| Coordinates | 43.58877, -97.17246 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 1,489 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 17,400 acre-ft |
| Max Storage | 17,400 acre-ft |
| Normal Storage | 7,040 acre-ft |
| Surface Area | 294 acres |
| Drainage Area | 402 sq mi |
| Max Discharge | 9,840 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Gf&p |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/14/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00031 |
| Federal ID | SD00031 |
| More Info | State Dam Safety Program |