The Pebble Creek Headwaters to Mainstem section of the Whitewater River Run in Montana is a popular and challenging whitewater stretch for experienced kayakers and rafters. The ideal streamflow range for this section is between 200 and 500 cfs, but it can be run up to 1,000 cfs with caution. The class rating for this section is primarily III-IV, with some V at high water levels. The segment mileage is approximately 10 miles.

Some of the specific rapids and obstacles on this stretch include Boof or Consequences, a 10-foot waterfall drop, and the Narrows, a tight and technical section with multiple hydraulics and steep drops. It is important to note that this section is only recommended for experienced paddlers due to the technical nature of the rapids and potential hazards.

Specific regulations to the area include a permit system for commercial outfitters and a requirement for all boaters to wear personal flotation devices. It is also important to respect private property and keep the area clean and free of litter.