Whitewater rapids generally are classified by level of difficulty. The class levels range from one to six, with one being the easiest and six being extreme, un-navigable and not appropriate for commercial operations. The classifications are considered a general guide only, and as might be expected, the availability of insuring markets thins as the classification number rises.
Whitewater classes:
Class 1. Easy, calm rapids with small waves and few or small easily avoidable obstacles.
Class 2. Slightly more difficult rapids with clear and obvious channels for passage, some obstacles; appropriate for a novice.
Class 3. An intermediate level — difficult rapids with high, irregular, numerous waves and eddies; narrow passages requiring ability to maneuver.
Class 4. Very difficult, with turbulent water, long rapids and constricted passages that require precise maneuvering. For advanced rafters only.
Class 5. Extremely difficult with long and violent rapids that follow one another in close succession; extremely obstructed river bed, violent currents and steep gradient. Significant risk of hazard to life in event of a mishap. For seasoned experts only and at the upper level of commercial usage.
Class 6. Hazardous in the extreme. Very dangerous, nearly impossible to navigate, definite risk to life.
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