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The Whitewater River Run from Headwaters to Alta Toquima Wilderness Boundary in Nevada is a thrilling ride for experienced kayakers and rafters. The ideal streamflow range is 300-600 cubic feet per second (cfs), which is generally available in the late spring to early summer. The river is rated Class III-IV, with some challenging rapids and obstacles that require technical maneuvering.

The segment mileage is approximately 10 miles, with the run starting at the Headwaters and ending at the Alta Toquima Wilderness Boundary. The river features several rapids, such as the "Narrows" and "Squeeze Box," that require precise navigation. There are also several boulder gardens and narrow sections that require skilled paddling.

There are specific regulations to the area that must be followed. All boaters need to obtain a permit from the Bureau of Land Management (BLM) before entering the river. The permit allows for a maximum group size of 12 people and a maximum of six watercraft per group. All boaters must also carry appropriate safety equipment, including personal flotation devices and helmets.

In conclusion, the Whitewater River Run from Headwaters to Alta Toquima Wilderness Boundary in Nevada is an exciting run for experienced kayakers and rafters. The ideal streamflow range is 300-600 cfs, the class rating is III-IV, and the segment mileage is approximately 10 miles. The river features several rapids and obstacles that require technical maneuvering, and there are specific regulations to the area that must be followed.