The whitewater river run from Tierra Amarilla Grant Boundary to Colorado Stateline in the state of Colorado is a class III to V run that spans 21 miles. The ideal streamflow range for this run is between 500-3000 cfs, providing exciting rapids and challenges for experienced paddlers. The segment includes steep, narrow canyons and multiple drops with technical maneuvers required to successfully navigate the rapids. Popular rapids such as "Eye of the Needle" and "Sledgehammer" add to the excitement of this run.

Specific regulations for this area include a permit requirement for commercial outfitters and a maximum group size of 25 people. Additionally, boaters are required to practice Leave No Trace principles and avoid disturbing wildlife habitats. The area also has strict regulations on camping and fires to protect the natural environment.