White River (NE-SD) near Oacoma, SD
River level and flood forecast · Lyman County
Normal7.8 ftas of Mon 3:15 PM
The river is 9.2 ft below flood stage (17 ft).
Flow: 105 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 25 ft |
| Moderate flood stage | 20 ft |
| Flood stage | 17 ft |
| Action stage | 15 ft |
| Record crest (March 16, 2011) | 25.02 ft |
What floods at each level
From the National Weather Service, highest first.
- 30 ftWater reaches Highway 47.
- 25 ftMajor Flood Stage. Extensive flooding along the White River with inundation of structures and roads.
- 23 ftModerate flooding along the south bank of the White River. Flooding of agricultural land downstream from the bridge along the north bank of the river.
- 22 ftModerate flooding continues. Water reaches the bottom of the Highway 47 bridge.
- 20 ftModerate Flood Stage. Some inundation of outbuildings, structures and roads near the White River are possible.
- 17 ftMinor flooding of agricultural land both upstream and downstream of the Highway 47 bridge along the west and south banks (right bank) of the White River.
- 16.5 ftWater begins to overflow into the trees on the west (right) bank along the river.
Highest crests on record
- 25.02 ft — March 16, 2011
- 24.87 ft — March 19, 2019
- 24.7 ft — March 4, 1994
- 24.44 ft — March 15, 2001
- 23.84 ft — February 20, 1997
Recent crests: 10.42 ft (May 19, 2025) · 16.02 ft (June 21, 2024) · 14.78 ft (June 12, 2023) · 11.64 ft (October 16, 2021) · 11.53 ft (March 22, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (OACS2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.