RIVER GAUGE · MOREAU RIVER (SD)
Moreau River (SD) at Promise
Dewey County, South Dakota
Water level7.97 ft
Flow—
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action18 ft
Minor flood21 ft
Moderate flood26 ft
Major flood30 ft
The past week
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What floods at each level
- 38 ft
Structures south of Promise Rd are in danger of flooding.
- 30 ft
The bridge at the gauge location on BIA-7 is overtopped.
- 28 ft
Water reaches the bottom of the bridge at the gauge location on BIA-7.
- 26 ft
The nearby higher ridges begin to be overtopped which may begin to threaten some lower lying roads.
- 24 ft
Most of the floodplain is underwater.
- 21 ft
The higher banks are overtopped and water enters the broader floodplain. Flooding possible along Promise Rd at bridge on Virgin Creek south of Moreau River.
- 18 ft
The lowest banks are overtopped and some ditches begin to fill.
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