The Whitewater River Run from Swamp Creek to Ruby Creek in Washington state is a class III-IV rapids stretch that covers a distance of approximately 9 miles. The ideal streamflow range for this section of the river is between 1,500 and 3,000 cfs. This flow level is perfect for intermediate and advanced paddlers.

Some of the notable rapids and obstacles on the Whitewater River Run include the 'Swamp Creek Falls,' 'Punchbowl,' 'Boulder Drop,' 'The S-Turn,' and 'The Box.' These rapids require a high level of technical skill and experience to navigate successfully.

In terms of regulations, paddlers are required to obtain a permit before embarking on this stretch of the river. The permit can be obtained from the Forest Service office in Enumclaw. Additionally, there are strict rules regarding the use of motorized boats and alcohol consumption on the river.

Overall, the Whitewater River Run from Swamp Creek to Ruby Creek is a challenging and exciting stretch of rapids that attracts experienced paddlers from across the country. It is essential to check the streamflow levels and obtain the necessary permits before embarking on this adventure.