Extreme flooding conditions are in effect in the upper Yellowstone and Gallatin river drainages, among others. FWP staff are working to evacuate and close all fishing access sites on the upper Yellowstone River. Portions of Missouri Headwaters State Park are also closed. More information will be posted as it becomes available.
Flooding conditions pose significant safety hazards, especially to recreationists. These conditions can arise and evolve without warning. Please abide by any closures that are in effect and avoid recreating on rivers during times of high flows.
Original source can be found here.