SOUTH DAKOTA FLOW REPORT
Last Updated: December 24, 2025
The streamflow conditions across South Dakota present a contrasting picture with instances of abnormally high streamflows indicating potential flooding concerns, as well as areas with significantly lower than usual flows that could signal drought conditions. Notably, the Whetstone River near Big Stone City reports an extraordinary streamflow of 29,300 cubic feet per second (cfs), a massive 2426.97% above normal, accompanied by a significant rise in gage height to 2.23 feet in the last 24 hours. This could affect communities along the river and may impact popular whitewater spots by creating hazardous conditions for water enthusiasts. In stark contrast, the James River near Yankton and the White River near Oacoma are experiencing streamflows markedly below normal, at -8.43% and -47.95% respectively, potentially affecting local water supplies and ecosystems.
In the Cheyenne River basin, the Cheyenne River at Redshirt shows a notable increase in flow at 311 cfs, 126.58% of the normal, hinting at an upward seasonal trend that kayakers and rafters might find favorable. However, caution is advised as such spikes can lead to swift currents. The Belle Fourche River near Elm Springs is another watershed with a considerable rise in streamflow at 17,900 cfs, which is 727.05% above the norm, raising the gage height to 4.93 feet and indicating possible flooding events. Residents and river users in the vicinity, including the Belle Fourche Reservoir area, should stay alert for any flood warnings. Conversely, the Inlet Canal above the Belle Fourche Reservoir shows a decrease in flow, which could affect water distribution for irrigation and local use. Overall, the diverse streamflow data from South Dakota underscores the need for vigilance among river communities, water managers, and recreational users in preparing for varying water conditions that could range from flooding to low-flow challenges.
South Dakota has a humid continental climate with four distinct seasons. The Missouri River, which forms the eastern border of the state, is the largest and most significant surface flow. It is subject to extreme flooding during spring and summer due to snowmelt and heavy rainfall. Other major rivers include the Cheyenne, James, and Big Sioux. The state has several reservoirs and dams, including the Oahe, Fort Randall, and Big Bend dams, which provide flood control, irrigation, and hydroelectric power. South Dakota's hydrology is influenced by its topography, soil type, and vegetation cover, which affect the amount and rate of water infiltration and runoff. The state's snowpack and precipitation patterns are important factors in determining water availability and storage.
Winter Storm Warnings
December 24 2025
Residents of South Dakota, particularly those in and around Aberdeen, are advised to exercise caution this morning. The National Weather Service has issued a Special Weather Statement alerting to patchy dense fog with visibility dropping to less than half a mile. As temperatures remain below freezing, the fog could lead to icy conditions on the roads, making travel hazardous. Drivers are urged to be particularly vigilant and allow extra time for travel. This advisory remains in effect until 10:30 AM CST. Please stay tuned to local weather updates and travel with care.