The Bear Valley Lake to Trailhead run on the Whitewater River in Idaho is a popular destination for kayakers and rafters. The ideal streamflow range for this run is between 800-1500 cfs. The class rating of this run varies from class II to class III, with some rapids reaching class IV during high water.

The segment mileage for this run is approximately 9 miles, starting at Bear Valley Lake and ending at the Trailhead. The river features several notable rapids and obstacles, including "the Flume," a narrow channel with a sharp right turn, and "the Narrows," a narrow section with large boulders that create challenging waves.

Regulations for the area include a requirement for all boaters to have a personal flotation device (PFD) and a whistle. The use of alcohol and drugs is prohibited, and boaters are required to pack out all trash and human waste.

Overall, the Bear Valley Lake to Trailhead run on the Whitewater River in Idaho offers an exciting and challenging experience for experienced boaters. It is important to check current streamflow levels and regulations before embarking on this adventure.