The Whitewater River Run from Hay Brook to the Bridge above Medway at State Route 157 in Maine is a popular destination for whitewater enthusiasts. The ideal streamflow range for this run is typically between 1,200 and 2,000 cfs. The class rating varies between II to III+, depending on the water level.

The segment mileage for this run is approximately 7 miles. The river features several notable rapids, including Big A and Little A rapids, which are both Class III+ rapids. Other notable rapids include Pinball, The Narrows, and Teardrop. Some of the obstacles in this stretch of the river include submerged rocks and fallen trees.

There are specific regulations in place for this area. Paddlers must wear personal flotation devices at all times, and motorized watercraft are not allowed on this stretch of the river. Additionally, all paddlers must obtain a permit from the Maine Department of Inland Fisheries and Wildlife before using this section of the river.

Overall, the Whitewater River Run from Hay Brook to the Bridge above Medway at State Route 157 in Maine offers a thrilling whitewater experience for paddlers, with challenging rapids and beautiful scenery along the way.