The Whitewater River Run from Anderson Ranch Dam to Confluence with Mennecke Creek in Idaho is a popular destination for whitewater rafting and kayaking enthusiasts. The ideal streamflow range for this stretch of the river is between 800 and 2,000 cfs. The class rating for this section of the river is Class III, with some Class IV rapids present in certain areas. The total segment mileage for this river run is approximately 9 miles.

The river features several notable rapids, including the infamous "Lunch Counter" and "Big Kahuna" rapids. These two rapids are the most challenging sections and require technical skills. Other notable rapids include "Kraken" and "Boat Eater," which are smaller but still offer exciting rides. The river also features several boulder gardens and steep drops, adding to the thrill of the run.

As for specific regulations, all boaters are required to wear a personal flotation device (PFD) at all times while on the river. It is also recommended that all boaters have prior whitewater experience before attempting this run. Finally, boaters must obtain a permit from the Bureau of Land Management (BLM) before accessing the river.

Overall, the Whitewater River Run from Anderson Ranch Dam to Confluence with Mennecke Creek is a challenging and exciting rafting and kayaking adventure, with a range of rapids and obstacles to navigate. Boaters should be well-prepared and experienced before taking on this run.