Logan Thoene No.1
Logan Thoene No.1 is an earth dam located in Gregory County, South Dakota, built in 1975. It carries a Low hazard potential classification.
About Logan Thoene No.1
The primary purpose of Logan Thoene No.1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Cindy Lillibridge (private). It impounds the Os-ponca Creek.
The dam stands 63 feet tall and stretches 882 feet across, and has a maximum storage capacity of 600 acre-feet. Completed in 1975, 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.
At 63 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | South Dakota |
| County | Gregory |
| Nearest City | None |
| River/Stream | Os-ponca Creek |
| Coordinates | 43.02285, -99.06722 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 63 ft |
| Dam Height | 63 ft |
| Dam Length | 882 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 600 acre-ft |
| Max Storage | 600 acre-ft |
| Normal Storage | 480 acre-ft |
| Max Discharge | 1,390 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Cindy Lillibridge |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02191 |
| Federal ID | SD02191 |
| More Info | State Dam Safety Program |