The international scale of river difficulty is an American system used to rate the difficulty of navigating a stretch of river, or a single rapid. The scale was created by the American Whitewater Asso
Class III rapid at Canolfan Tryweryn, Wales.
Black Fork Mohican River
Madawaska River Whitney
Watauga The Big Hole
Riffle
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A riffle is a shallow landform in a flowing channel. Colloquially, it is a shallow place in a river where water flows quickly past rocks. However, in geology a riffle has specific characteristics.
International scale of river difficulty
…pose specific challenges. A summary of river classifications as presented by the American Whitewater Association: Class I: Easy Fast moving water with riffles and small waves. Few obstructions, all obvious and easily missed with little training. Risk to swimmers is slight; self-rescue is easy. Class II: Novice…
Riffle on the Onega River
A raft in a Class II- riffle on the Middle Fork Salmon