The Marble Canyon section of the Colorado River, also known as River Segment 2, is a popular whitewater river run located in the state of Colorado. The ideal streamflow range for this section of the river is between 800 and 3,000 cubic feet per second (cfs). This flow range provides Class III and IV rapids, which offer exciting challenges for intermediate to advanced paddlers.

The Marble Canyon section is approximately 25 miles long, starting at the BLM public access point near Kremmling and ending at State Bridge. Along this stretch of river, paddlers encounter several notable rapids and obstacles, including Eye of the Needle, a Class IV rapid that requires precise navigation through a narrow channel. Other notable rapids include Yarmony Rapid, a Class III+ rapid that features a large wave train and several technical moves, and Upper and Lower Beaver Falls, which offer thrilling drops and hydraulics.

In addition to the rapids, paddlers must be aware of specific regulations in the area. Permits are required for commercial trips, and all boaters must abide by Leave No Trace ethics to preserve the natural beauty of the area. Paddlers should also be aware of private property boundaries and respect them while navigating the river.

Overall, the Marble Canyon section of the Colorado River provides an exciting whitewater experience for paddlers seeking Class III and IV rapids. With challenging obstacles and beautiful scenery, this river run is a must-visit for experienced whitewater enthusiasts.