The whitewater river run below Rio Grande Reservoir to Spring Creek in Colorado spans a distance of approximately 18 miles, with a recommended streamflow range of 500 to 1,500 cubic feet per second (cfs) during the peak season of May through July. This segment is rated as Class III to IV, with several challenging rapids and obstacles such as Widdle Waddle, Baby Falls, and Razor Rock.

Due to the remote location of the river, there are no specific regulations or permits required for this run. However, it is important to practice Leave No Trace principles and respect private property along the riverbank. It is also recommended to have experience with Class III to IV rapids and to wear appropriate safety gear, including a helmet and personal flotation device.