After summiting Rainy Pass, Iditarod dog teams travel downhill along Pass Fork Creek. This small high mountainous creek is thick with willows and windy curves. After several miles, Pass Fork converges with the slightly larger Dalzell Creek. This creek is still high up in the mountains. The Dalzell Gorge is a section of the creek that has high cliffs on either side. It creates a seemingly "ice canyon" roller coaster for the dog teams because they still have good speed traveling downhill. The Gorge continues to funnel dog teams even farther downhill and eventually the trail pops out onto the Tatina River. The wind blown and icy Tatina is a larger river. The mountain terrain is visible from every direction as the team travels along the Tatina. Rohn Checkpoint lies at the confluence of the Tatina and the Kuskokwim.