Class IV - Difficult . Suitable for advanced paddlers in closed canoes and white-water boats. Not suitable for open canoes. Large and numerous waves with very fast current. Inspection from the shore may be required.
Rapids require an advanced level of skill.
Class V - Very Difficult . Suitable for expert white-water paddlers only. Heavy water with very large irregular waves. The violence of the rapids makes inspection mandatory. Class VI - Extraordinarily Difficult .