A riffle is a very small rapid and often nothing more than a little bubbly water that flows over a shallow section of the river. Riffles are not usually named (though some are) and most pose little threat to an oar boat or paddle raft.
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Class IV Rapids - Whitewater with Obstacles and More Technical Skills » Larger waves, narrow passages, and multiple obstacles to avoid requiring precise maneuvering to avoid upset.
Whirlpool Rapids Gorge—Niagara River, New YorkThe Niagara Gorge is a deadly section of exploratory rapids. As the water travels through, it reaches about 30 mph, creating the Class 6 Whirlpool Rapids, some of the most extreme in the entire world.
While most people can raft Class 4 rapids for their first time, there are several requirements. The minimum age to raft Class 4 rivers, depending on the river and company, is 12-14 years old. Many Class 4s recommend that you are in good physical condition, on the adventurous side, and know how to swim.
Feel the thrill of being at the river's edge! White Water Walk offers a first-hand lesson in the raw power and peril of the Niagara River's Class 6 whitewater rapids, some of the wildest in North America.
The Grand Canyon stretch of the Colorado River often uses a different rating system. The Class 1-10 system that is used in the Grand Canyon roughly parallels Classes I-V on the International Scale of River Difficulty (ISRD).
The Yellowstone River is classified as Class II-III rapids from Yellowstone National Park to Paradise Valley (the first 18 miles of legally navigable whitewater on the Yellowstone River).
Upper Tuolumne River (Cherry Creek), CaliforniaCherry Creek is the gold standard for Class V and is the hardest section of commercially rafted whitewater in the United States. Rapids like Mushroom (V), Toadstool (V), and Lewis's Leap (V) challenge even the most experienced river guides.
The Niagara Gorge is a deadly section of exploratory rapids. As the water travels through, it reaches about 30 mph, creating the Class 6 Whirlpool Rapids, some of the most extreme in the entire world.
Futaleufu River, ChileA number of river rafting pros and enthusiasts consider it to be one of the most challenging rapids in the world. The white water rafting river is ensconced in the valleys of brooding cliffs. Especially, the Upper Section of the Futaleufu River is navigated by only expert rafters.
On a scale from I-VI, the rapids on the Snake River are class II-III during normal water flows. During the springtime runoff (typically the first couple weeks in June), we do have waves that can get up to a class IV. When the Snake River gets up to these levels, our minimum age limit for whitewater rafting may change.