Thomas Number 3 is an earth dam located in Jones County, South Dakota, built in 1959. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 405 ft long, taller than 62% 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 Thomas Number 3
The primary purpose of Thomas Number 3 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 Tr-white River.
The dam stands 28 feet tall and stretches 405 feet across, and has a maximum storage capacity of 49 acre-feet. Completed in 1959, 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. The most recent inspection on record was 06/01/1990. That was over 36 years ago.
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Location
| State | South Dakota |
| County | Jones |
| Nearest City | None |
| River/Stream | Tr-white River |
| Coordinates | 43.74666, -100.71832 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 405 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 49 acre-ft |
| Max Storage | 49 acre-ft |
| Normal Storage | 31 acre-ft |
| Max Discharge | 1,050 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/01/1990 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01629 |
| Federal ID | SD01629 |
| More Info | State Dam Safety Program |