International Whitewater Rating System
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Class Description
I Easy moving water with a few riffles and small waves.
II Easy to Medium rapids with waves up to 3 feet high, some obvious obstacles to maneuver around.
III Medium to Moderately Difficult rapids with high irregular waves, narrow channels, rocks and holes, some maneuvering required.
IV Difficult to very Difficult; long turbulent rapids with powerful waves and holes, many obstacles requiring precise maneuvering.
V Extremely Difficult; long violent rapids that must be scouted from shore, dangerous drops, unstable eddys, irregular currents.
VI Unrunnable - Don't even think about it!