The Whitewater River Run is a popular stretch of river in Idaho that begins at Road 581, Sec. 19, T39N, R13E and ends at Mouth, Sec. 18, T39N, R10E. This segment of the river is approximately 15 miles long and offers a variety of rapids and obstacles that range from Class II to Class IV.

The ideal streamflow range for this section of the river is between 1,000 and 4,000 cubic feet per second (cfs). At lower flows, the rapids can become more technical and require more maneuvering, while at higher flows, the rapids can become more powerful and dangerous.

Some of the specific rapids and obstacles on this stretch of river include Big Eddy, Chicken Coop, and Devil's Slide. These rapids range in difficulty from Class II to Class IV and offer a fun challenge for experienced rafters and kayakers.

As for regulations, it is important to note that this section of the river is located on public land managed by the Bureau of Land Management (BLM). Therefore, visitors must follow all BLM regulations, including Leave No Trace principles, camping restrictions, and fire regulations. Additionally, all visitors must have a valid Idaho fishing license if planning to fish on the river.

Overall, the Whitewater River Run is a popular and challenging section of river in Idaho that offers a range of rapids and obstacles for experienced rafters and kayakers. Visitors should be mindful of ideal streamflow range, class rating, specific rapids/obstacles, and regulations to ensure a safe and enjoyable trip.