Entrance to First (Upper) Black Box

This challenging Class IV rapid marks the entrance to the Upper Black Box canyon, featuring a tight, technical line through a constricted gorge with powerful hydraulics and potential undercut rock formations. Paddlers must navigate a series of steep drops and complex water currents, carefully selecting a precise route to avoid hazardous holes and rocky obstructions that can easily flip or pin a boat. Scouting is strongly recommended, as the rapid's complexity demands precise boat control and an intimate understanding of river dynamics.