The Rio Grande River Segment A, located in Colorado, is a popular destination for whitewater enthusiasts. The ideal streamflow range for this segment is between 300 and 1,000 cubic feet per second (cfs), with peak flow occurring during late May and early June. This segment is rated as a Class II-III, suitable for intermediate-level paddlers.

The segment covers a distance of 10 miles, starting at the Weminuche Wilderness boundary and ending at the South Fork of the Rio Grande. The river features a number of rapids and obstacles, including the Play Hole, Pinball, and the famous Toilet Bowl. The Toilet Bowl is a Class III rapid with a large hole that can flip rafts and kayaks if not navigated correctly.

There are specific regulations that apply to the Rio Grande River Segment A. The use of motorized equipment is prohibited, and all visitors must have a permit to enter the Weminuche Wilderness area. Additionally, all visitors must practice Leave No Trace principles and pack out all trash.

In summary, the Rio Grande River Segment A offers intermediate-level whitewater rafting with a Class II-III rating. The ideal streamflow range is between 300-1,000 cfs, and the segment covers a distance of 10 miles with several notable rapids and obstacles. Specific regulations apply to the area, including a prohibition on motorized equipment and a requirement for wilderness permits.