Petranek #1
Petranek #1 is an earth dam located in Mellette County, South Dakota, built in 1934. It carries a Low hazard potential classification.
About Petranek #1
The primary purpose of Petranek #1 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by S&pl (state). It impounds the Little White River-tr.
The dam stands 33 feet tall and stretches 1,174 feet across, and has a maximum storage capacity of 376 acre-feet. Completed in 1934, 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 09/27/2023.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | South Dakota |
| County | Mellette |
| Nearest City | None |
| River/Stream | Little White River-tr |
| Coordinates | 43.55316, -100.72929 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 1,174 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 376 acre-ft |
| Max Storage | 376 acre-ft |
| Normal Storage | 319 acre-ft |
| Max Discharge | 1,780 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | S&PL |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 09/27/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01470 |
| Federal ID | SD01470 |
| More Info | State Dam Safety Program |