Strong eddies and powerful current effects can be found, particularly on large-volume rivers. Complex maneuvers in fast current and good boat control in tight passages or around ledges are often required large waves or strainers may be present but are easily avoided. Rapids with moderate, irregular waves which may be difficult to avoid and which can swamp an open canoe. Rapids that are at the upper end of this difficulty range are designated Class II+. Swimmers are seldom injured and group assistance, while helpful, is seldom needed. Occasional maneuvering may be required, but rocks and medium-sized waves are easily avoided by trained paddlers. Straightforward rapids with wide, clear channels which are evident without scouting. Risk to swimmers is slight self-rescue is easy. Few obstructions, all obvious and easily missed with little training. Details of portages may be given if these pose specific challenges.Ī summary of river classifications as presented by the American Whitewater Association: Class I:įast moving water with riffles and small waves. While a river section may be given an overall grading, it may contain sections above that grade, often noted as features, or conversely, it may contain sections of lower graded water as well.
#4 IMAGE PLUS NIVEAU 3 PLUS#
Often a river or rapid will be given a numerical grade, and then a plus (+) or minus (-) to indicate if it is in the higher or lower end of the difficulty level. The grade of a river may (and usually does) change with the level of flow. For instance, there can be difficult grade twos, easy grade threes, and so on. The scale is not linear, nor is it fixed. There are six categories, each referred to as grade or class followed by a number.
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