The Moose to Storm Castle River Run on the Gallatin River in Montana offers Class II-III rapids and is best floated from June to August with a recommended flow of 1,500 to 3,000 cfs. Obstacles include boulder gardens, tight channels, and a few larger drops, so paddlers should have some experience and be prepared for technical maneuvers. The run is scenic with views of the surrounding mountains and forests, but water levels can vary greatly, so it's important to check before heading out.