The Whitewater River Run Segment B is a 13.8 mile stretch of the river that starts from Alexander Springs Wilderness Boundary and ends at Confluence with St. Johns River in Florida. The ideal streamflow range for this segment of the river is between 100-300 cubic feet per second (cfs). This range provides an optimal water level to navigate through the various rapids and obstacles without being too low or high.

The class rating for this segment of the Whitewater River Run is Class II-III, with occasional Class IV rapids. The rapids are challenging, but not too extreme, making it ideal for intermediate-level kayakers and rafters. Some specific rapids and obstacles to watch out for include The Maze, Brain Buster, and Carnage.

There are specific regulations to the area that visitors need to follow. For instance, boaters are required to wear personal flotation devices (PFDs) at all times while on the river. Additionally, the use of alcohol and drugs is prohibited while on the river, and visitors are required to pack out all trash they bring in.

In conclusion, the Whitewater River Run Segment B is a challenging and exciting stretch of the river to navigate for intermediate-level kayakers and rafters. The ideal streamflow range is between 100-300 cfs, with a class rating of II-III. Visitors need to follow specific regulations to the area, including wearing PFDs, avoiding alcohol and drugs, and packing out all trash they bring in.