Highway 44 #6 is an earth dam located in Mellette County, South Dakota, built in 1973. It carries a Significant hazard potential classification.
Dam profile
NID height · 102 ft102 ft tall and 450 ft long, taller than 98% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Highway 44 #6
Highway 44 #6 is a dam in Mellette, South Dakota. The dam is owned by Dept. of Transportation (state). It impounds the Tr Little White Offstream.
The dam stands 102 feet tall and stretches 450 feet across, and has a maximum storage capacity of 900 acre-feet. Completed in 1973, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 11/02/2023.
At 102 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | South Dakota |
| County | Mellette |
| Nearest City | None |
| River/Stream | Tr Little White Offstream |
| Coordinates | 43.56468, -100.75364 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 102 ft |
| Dam Height | 102 ft |
| Dam Length | 450 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 900 acre-ft |
| Max Storage | 900 acre-ft |
| Normal Storage | 400 acre-ft |
| Max Discharge | 6,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Dept. of Transportation |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/02/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01474 |
| Federal ID | SD01474 |
| More Info | State Dam Safety Program |