The Whitewater River Run Trail #329 is located in the state of Montana and stretches from Sec. 15, T7N, R7W to Sec. 28, T8N, R7W. The ideal streamflow range for this trail is between 500 and 1500 cfs. This section of the river is rated as class II-III, making it suitable for intermediate to advanced kayakers and rafters. The segment mileage is approximately 18 miles.

There are several specific rapids and obstacles along the Whitewater River Run Trail, including Purgatory, Harry's Hole, and the Triple Bridges. Purgatory is a class III rapid located near the beginning of the trail and features a large boulder in the middle of the river. Harry's Hole is a class II rapid that can be dangerous at higher water levels. The Triple Bridges are a set of three bridges that signal the end of the trail.

In terms of regulations, there are several things to keep in mind when planning a trip on the Whitewater River Run Trail. First and foremost, all boaters must wear a personal flotation device (PFD) at all times. Additionally, there are restrictions on the use of motorized boats, and all boats must be registered with the state. Finally, visitors should be aware that the area surrounding the trail is designated as wilderness, and as such, visitors are expected to practice Leave No Trace principles.