The Whitewater River run from Headwaters, Sec. 17, T19N, R15W to Seeley Lake, Sec. 20, T17N, R15W in Montana is a popular destination for kayaking and whitewater rafting enthusiasts. The ideal streamflow range for this stretch of the river is between 800 and 2,000 cubic feet per second (cfs), which typically occurs during the late spring and early summer months.

This section of the river is classified as a class II-III, which means that it has moderate to difficult rapids with moderate to high waves. The segment mileage from Headwaters to Seeley Lake is approximately 30 miles, with several notable rapids and obstacles, including Wilderness Rapid, Split Rock Rapid, and Fang Rapid.

There are several regulations that apply to this area, including a requirement for a Montana fishing license if fishing in the river. Additionally, there may be restrictions on the use of motorized boats or certain types of equipment in certain sections of the river. It is important to check with local authorities or guide services for specific regulations and requirements before embarking on a trip down the Whitewater River run.

Overall, the Whitewater River run is a challenging and exciting adventure for experienced kayakers and whitewater rafters. It is important to always use caution and follow safety protocols while on the river to ensure a safe and enjoyable experience.