SOUTH DAKOTA FLOW REPORT

Last Updated: February 13, 2026

In South Dakota, recent streamflow data indicates a mixture of hydrological patterns with some rivers experiencing significant surges likely to interest water enthusiasts and professionals monitoring for flood risk. The Whetstone River near Big Stone City shows a dramatic increase in flow, surging to 29,300 cubic feet per second (cfs), 2,426.97% of its normal streamflow, alongside a notable rise in gage height to 1.47 feet. This sharp uptick suggests potential flooding concerns for surrounding areas. Conversely, the Cheyenne River in various locations, such as near Buffalo Gap, at Redshirt, and near Wasta, has less dramatic streamflow changes but indicates modest increases which could signal a shift in seasonal trends and require close observation for any further rise.

Taking a more detailed look, the Belle Fourche River near Elm Springs shows a significant increase to 17,900 cfs, a remarkable 727.05% above normal, coupled with a 5.11 feet gage height, suggesting an abnormally high flow likely affecting local waterways and potentially impacting whitewater conditions. In contrast, the James River across various checkpoints from Stratford to Yankton presents a complex picture with some sections, like at Huron, above average flows at 73.87% of normal, while other portions like near Mitchell indicate lower streamflow. The Big Sioux River, important for both Brookings and Sioux Falls, remains closer to average flows, yet any outdoor recreationists should stay informed of current conditions given the river's importance for local whitewater trails. In summary, the current streamflow data indicates substantial regional variability with certain rivers such as the Whetstone and Belle Fourche experiencing significant flow increases that may impact both the ecosystem and human activities along these watercourses.