The Whitewater River run from Rm 47 to Rm 52 on the Upper End of Nestucca River in Oregon is a Class III-IV river segment. The ideal streamflow range for this stretch is between 1,000-3,500 cfs. The segment mileage is around five miles, and it offers exciting rapids and obstacles for experienced kayakers and rafters.

Some of the specific rapids and obstacles on this stretch of river include the Narrows, a narrow and steep drop, the Grotto, a boulder garden rapid, and the S-Turns, a series of tight turns with strong currents. Rafters and kayakers should also be aware of the rocks and logs in the river, which can be hazardous.

The specific regulations for this area include a permit requirement for all commercial outfitters and a limit on the number of commercial trips per day. Additionally, recreational boaters are required to wear a Type III or V personal flotation device while on the river.

Overall, the Whitewater River run from Rm 47 to Rm 52 on the Upper End of Nestucca River is an exciting and challenging stretch of river for experienced kayakers and rafters. Boaters should be aware of the ideal streamflow range, class rating, specific rapids and obstacles, and regulations for the area before embarking on their adventure.