The Whitewater River Run in Maine is a popular destination for experienced whitewater enthusiasts. The ideal streamflow range for this river is between 1000-3000 cfs. The river is rated as class IV-V rapids, indicating that it is only suitable for experienced paddlers who are well-versed in navigating swift currents and turbulent rapids. The river has a total segment mileage of approximately 30 miles and runs from the headwaters to the confluence with the Penobscot River, East Branch.

Some of the specific rapids and obstacles on the Whitewater River Run include Big Poplar Falls, which is a 20-foot waterfall, and Screaming Left Turn Rapid, which is a technical class V rapid that requires precise maneuvering skills. Other notable rapids include the Pinball Rapid, the Haystack Rapid, and the Toilet Bowl Rapid.

It is important to note that there are specific regulations that apply to the Whitewater River Run. For instance, paddlers are required to have a Maine whitewater guide license to operate commercial trips on the river. Additionally, all paddlers must wear a personal floatation device (PFD) at all times while on the river, and it is recommended to wear a helmet as well.

Overall, the Whitewater River Run is a challenging and exhilarating adventure for experienced whitewater enthusiasts. Paddlers should be prepared for difficult rapids and obstacles, and should always follow the specific regulations and safety guidelines to ensure a safe and enjoyable experience.