The Whitewater River Run from Headwaters to Mouth at West Branch Pleasant River in Maine is a challenging yet rewarding whitewater experience. The ideal streamflow range for this run is between 250-600 cfs, with higher water levels offering more technical rapids and obstacles. The class rating of this segment ranges from Class II to Class IV, depending on the water levels. The segment mileage is approximately 9 miles, starting at the headwaters and ending at the mouth of West Branch Pleasant River.

The specific river rapids and obstacles on this run include Big A rapids, which is a Class IV rapid with a large and technical drop, and Moose Island rapid, which is a Class III rapid with a narrow channel and strong currents. Other notable rapids include Eagle's Nest, Powerline, and The Ledges. Paddlers should also be aware of several portages on this run, including one around a dam at the start of the run.

There are specific regulations to the area that paddlers must follow. The Maine Department of Inland Fisheries and Wildlife requires all paddlers to have a valid Maine River Access Sticker displayed on their boat. Additionally, the state has regulations on allowable boating hours and equipment requirements, such as personal flotation devices and proper safety equipment.

Overall, the Whitewater River Run from Headwaters to Mouth at West Branch Pleasant River offers a challenging and exciting experience for experienced whitewater paddlers. With its specific regulations and technical rapids, it is important for paddlers to be prepared and knowledgeable before embarking on this adventure.