The Whitewater River run from Pond in Sec 35, T26N, R9E to Confluence with Spanish Creek in California is a thrilling whitewater adventure. The ideal streamflow range for this run is between 300 and 800 cfs, depending on the time of the year and snowmelt. This run is rated as Class III-IV, making it suitable for intermediate and advanced paddlers. The segment mileage for this run is approximately 8 miles.

The Whitewater River run has several challenging rapids and obstacles, such as the "Entrance Rapid," "The Maze," and "Souse Hole." At "Entrance Rapid," paddlers need to navigate through a boulder garden with several surfing opportunities. "The Maze" is a technical section that requires precise maneuvering through a series of boulders. "Souse Hole" is another challenging rapid that requires avoiding the recirculating water at the bottom of the drop.

Specific regulations to the area include a requirement for life jackets and helmets, which are mandatory for all paddlers. Additionally, there are restrictions on camping and fires along the riverbank. Paddlers are advised to check with local authorities before embarking on the Whitewater River run for any updates or changes in regulations.

In conclusion, the Whitewater River run from Pond in Sec 35, T26N, R9E to Confluence with Spanish Creek in California is a challenging whitewater adventure suitable for intermediate and advanced paddlers. The ideal streamflow range is between 300 and 800 cfs, and the run is rated as Class III-IV. Paddlers should be aware of specific regulations to the area, including mandatory life jackets and helmets and restrictions on camping and fires.