East Lemmon is an earth dam located in Perkins County, South Dakota, built in 1930. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 1,200 ft long, taller than 68% 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 Lemmon
The primary purpose of East Lemmon is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gf&p (state). It impounds the Tr-grand.
The dam stands 30 feet tall and stretches 1,200 feet across, creates a reservoir covering 165 acres, has a maximum storage capacity of 2,600 acre-feet, and collects water from a drainage area of 88 square miles. Completed in 1930, 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 11/07/2018.
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Location
| State | South Dakota |
| County | Perkins |
| Nearest City | None |
| River/Stream | Tr-grand |
| Coordinates | 45.77418, -102.01329 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 2,600 acre-ft |
| Max Storage | 2,600 acre-ft |
| Normal Storage | 1,360 acre-ft |
| Surface Area | 165 acres |
| Drainage Area | 88 sq mi |
| Max Discharge | 8,429 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Gf&p |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/07/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00921 |
| Federal ID | SD00921 |
| More Info | State Dam Safety Program |