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The Whitewater River Run Southern Boundary of State Land to Mouth is a popular river run in Idaho, offering a thrilling adventure for experienced kayakers and rafters. The ideal streamflow range for this run is between 1,500 and 3,000 cfs, as any higher or lower can make it too difficult or too dangerous to navigate.

This run is classified as a class III-IV, which means it has moderate to difficult rapids and requires skill and experience to navigate. The segment mileage of this run is 18.8 miles, starting from the southern boundary of state land and ending at the mouth of the river.

Some of the specific river rapids and obstacles that kayakers and rafters may encounter on this run include the Whitewater Falls, which is a 20-foot waterfall that requires careful navigation, as well as the Big Rocks Rapid, which has large boulders and fast-moving water.

There are specific regulations that must be followed in this area, including carrying a personal flotation device (PFD) for each person on board, as well as having a whistle and a throwable device on hand. Additionally, there are restrictions on the use of motorized boats and certain types of fishing equipment.

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