The Whitewater River Run in Washington state is an exciting adventure for experienced whitewater enthusiasts. The ideal streamflow range for this segment is between 1500-3000 cfs, providing Class III-IV rapids. The segment mileage for this run is 0.5 miles, starting at the Headwaters and ending at the Upper Goodell Campground.

The specific rapids and obstacles on this run include the "Entrance Rapid," which starts with a steep drop into a boulder field, followed by "The Wall," a narrow chute with a steep drop. "The Slot" is a narrow and steep section with a tricky entrance, and "The Notch" is a tight S-curve with large boulders. The run finishes with "The S-Turn," a series of quick turns through a narrow channel.

This stretch of the Whitewater River is regulated by the National Park Service, with specific regulations in place to protect the environment and ensure safety. These regulations include a required permit to launch, a limit on the number of launches per day, and restrictions on equipment and group size. Additionally, visitors are required to follow Leave No Trace principles and respect wildlife and natural resources.

Sources:
- American Whitewater, "Whitewater River - Headwaters to Upper Goodell Campground," https://www.americanwhitewater.org/content/River/detail/id/2282/
- National Park Service, "North Cascades National Park - Whitewater River," https://www.nps.gov/noca/planyourvisit/whitewater-river.htm