Classification of Rapids (under normal flow conditions)
Class 1
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Small and regular waves; easily navigated passages. Usually navigable by novice paddlers.
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Class 2
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Regular, medium sized waves; low ledges; sweepers; log jams may be present; passages clear though narrow and requiring competent maneuvering. Inspection usually required. At least one member of team should be intermediate paddler.
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Class 3
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Waves numerous, high and irregular; exposed rocks; strong eddies. Inspection strongly recommended. Upper limit for open canoe. Usually navigable by intermediate to expert paddlers.
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Class 4
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Waves high, powerful and irregular; dangerous exposed rocks; boiling eddies; passages difficult to reconnoitre. Inspection mandatory. Powerful and precise maneuvering required. Rapids of this class, and over, should only be attempted by expert paddlers in covered canoes.
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Class 5
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River channel extremely obstructed; ledges; violent and fast current; abrupt corners. Reconnoitring mandatory but difficult.
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Class 6
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Difficulties of Class 5 carried to extremes of navigability. Definite risk of life involved.
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