This is an excellent commercial rafting run, with more exciting rapids and better solitude than the South Fork American offers, even on weekdays. During “crowded” weekends on the Middle Fork American, you encounter so few people that you might be glad to see them. Tunnel Chute (usually rated class V) is quite an adrenalin rush, and the portage around Ruck-a-Chucky (formerly rated unrunnable) is amazing.