The Nestucca River Seg B, located in Oregon, offers a thrilling whitewater river run for experienced paddlers. The ideal streamflow range for this segment is between 800-2,500 cfs. The segment is rated Class III-IV, with several rapids and obstacles that require technical skills to navigate safely.

The segment is approximately 11.5 miles long and can take up to 5 hours to complete. Paddlers can expect to encounter rapids such as "Holy Water," "Pinball," and "Can Opener," which offer challenging drops and strong currents.

It is important to note that the Nestucca River Seg B has specific regulations in place to protect the area's natural resources. Paddlers are required to obtain a permit from the Oregon Department of Fish and Wildlife before entering the river. Additionally, the segment is closed to all boating activities from October 1st to December 31st to protect spawning salmon populations.

In conclusion, the Nestucca River Seg B offers a thrilling whitewater river run for experienced paddlers. Paddlers must be aware of the ideal streamflow range, class rating, segment mileage, specific rapids/obstacles, and regulations in place to protect the area's natural resources.