The Whitewater River run in Idaho is a challenging yet thrilling experience for adventurous rafters. The ideal streamflow range for this river run is between 500 and 2500 cfs. The river is rated as a class IV-V, making it suitable only for experienced rafters who have proper training and equipment. The segment mileage of the river run is approximately 5.5 miles, which includes the mainstem and the lower 2 miles of the North, South, and Siddoway Forks to one mile above the Trailhead.

The river rapids/obstacles on this run include many Class IV-V drops, narrow canyons, and steep drops. Some of the notable rapids and obstacles are the Powerhouse Rapid, the Flat Creek Rapid, the Jump Off, and the Propane Rapid. Rafters should be prepared for big waves, technical rapids, and strong currents.

The specific regulations to the area include obtaining a permit from the Bureau of Land Management (BLM) before embarking on the river run. The BLM also regulates the number of rafters allowed on the river run at any given time. Additionally, all rafters are required to wear personal flotation devices and follow Leave No Trace principles.

In conclusion, the Whitewater River run in Idaho is a challenging yet exhilarating experience for experienced rafters. The ideal streamflow range is between 500 and 2500 cfs, and the river is rated as a class IV-V. The segment mileage is approximately 5.5 miles, and rafters should be prepared for big waves, technical rapids, and strong currents. Specific regulations include obtaining a permit, following Leave No Trace principles, and wearing personal flotation devices.