Rahn Lake Dam
Rahn Lake Dam is an earth dam located in Tripp County, South Dakota, built in 1936. It carries a Low hazard potential classification.
About Rahn Lake Dam
The primary purpose of Rahn Lake Dam 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 Keya Paha River-tr.
The dam stands 22 feet tall and stretches 570 feet across, and has a maximum storage capacity of 891 acre-feet. Completed in 1936, 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 12/21/2023.
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Location
| State | South Dakota |
| County | Tripp |
| Nearest City | None |
| River/Stream | Keya Paha River-tr |
| Coordinates | 43.10346, -99.83496 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 570 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 891 acre-ft |
| Max Storage | 891 acre-ft |
| Normal Storage | 320 acre-ft |
| Max Discharge | 2,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GF&P |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 12/21/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00539 |
| Federal ID | SD00539 |
| More Info | State Dam Safety Program |