Larsen Dam is an earth dam located in Lyman County, South Dakota, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 350 ft long, taller than 55% 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 Larsen Dam
The primary purpose of Larsen Dam 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 Dry Draw near Oacoma.
The dam stands 26 feet tall and stretches 350 feet across, creates a reservoir covering 31 acres, has a maximum storage capacity of 280 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1937, 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 10/19/2017.
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Location
| State | South Dakota |
| County | Lyman |
| Nearest City | Oacoma |
| River/Stream | Dry Draw |
| Coordinates | 43.82979, -99.56955 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 350 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 280 acre-ft |
| Max Storage | 280 acre-ft |
| Normal Storage | 183 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 600 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/19/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02171 |
| Federal ID | SD02171 |
| More Info | State Dam Safety Program |