The Whitewater River Run in Maine covers a distance of approximately 18 miles from the headwaters to the confluence with the Penobscot River East Branch. The ideal streamflow range for this stretch of river is between 500 and 2,000 cubic feet per second (cfs).

The class rating for this stretch of river varies from class II to class IV, depending on the section. The upper section, from the headwaters to Bowlin Camps, is mostly class II with some class III rapids. The middle section, from Bowlin Camps to the Grand Pitch, is primarily class III with some class IV rapids. The lower section, from the Grand Pitch to the confluence with the Penobscot River East Branch, is mostly class II and class III with a few class IV rapids.

Some of the notable rapids and obstacles on this river include Bowlin Falls, the Grand Pitch, Big A rapids, and the Staircase. These rapids range in difficulty from class III to class IV and require skilled paddling and maneuvering to navigate safely.

There are specific regulations in place for this area, including a limit on the number of paddlers per group and a requirement for a permit to access the river. Additionally, all paddlers are required to wear a personal flotation device (PFD) while on the water.