The Swallow Canyon to Lodore river run on the Green River in Utah is a thrilling adventure for experienced paddlers. The Class III and IV rapids, including Hell's Half Mile, will keep you on your toes. The best time to float this section is from May to July, when the water levels are high and the weather is mild. The ideal CFS (cubic feet per second) for this run is between 1,500 and 5,000. Be prepared for rocky terrain and narrow channels, but also enjoy the stunning red rock canyon scenery and abundant wildlife sightings.