The whitewater river run from Arrowhead Lake to Wildhorse Campground in Idaho is a popular destination for kayakers and rafters. The ideal streamflow range for this run ranges from 1,000 to 4,000 cfs, with the optimal flow rate being around 2,000 cfs. The class rating for this run is considered to be class IV, which is a difficult level of whitewater that requires advanced paddling skills.

This river run covers a distance of approximately 10 miles and is known for its challenging rapids and obstacles. Some of the most notable rapids include Staircase, Devil's Toenail, and Wildhorse. These rapids are known for their steep drops, tight chutes, and powerful hydraulics. The river also features several boulder gardens, which require precise maneuvering to navigate safely.

In terms of regulations, all boaters on this river are required to wear a personal flotation device at all times. Additionally, the use of alcohol and drugs is prohibited while on the river. Boaters should also be aware that there are several private landowners along the river, and it is important to respect their property rights and stay within the designated river corridor.

Overall, the Arrowhead Lake to Wildhorse Campground run is a challenging and rewarding whitewater experience for experienced paddlers. It is important to check the streamflow levels before embarking on this run, as high water can make the rapids even more difficult and dangerous.