The Gallatin River is a popular whitewater destination in Montana, running from its headwaters in the Gallatin Range to its confluence with the Madison River. The section between the Gallatin Forest Boundary in Sec. 32, T7S, R7E and Yellowstone National Park in Sec. 23, T9S, R8E is a challenging and scenic 30-mile stretch that is rated as Class II-IV, depending on the water levels.

The ideal streamflow range for this section is between 1,000 and 5,000 cfs, which typically occurs during the spring snowmelt and after significant rainfall. The river rapids and obstacles include the House Rock, Screaming Left Turn, Mad Mile, and the notorious House Rock Rapid. These features provide a thrilling ride for experienced paddlers, but can be dangerous for novice kayakers or rafters.

There are specific regulations to the area, including a limit on the number of commercial outfitters and a prohibition on alcohol consumption while on the river. It is also important to note that the river flows through private land, so respect for property rights and responsible behavior are essential.