contains sections appropriate for every level of expertise including an easy Class II section, several Class III and Class-IV sections, as well as some Class V. There is a Class VI waterfall that is very dangerous because the last drop is unrunnable. The water pours off a slab into a -wide crack and grinds anything that goes into it. Clear Creek (Colorado) Colorado River-This river is the most famous whitewater river in the country, with sections in Arizona, Nevada (near Hoover Dam), and Colorado; it is also one of the longest rivers in the Western deserts and its overall classification ranges from I-V+. Gore Canyon is the first difficult section and should not be attempted by novices, Class IV-V, depending on the time of year and rainfall and this part is the upper section in Colorado. The section through the Grand Canyon and Grand Canyon National Park would include the Hance Rapids and overall the class of the rapids here are I-V, with the overall section being a IV. Cataract Canyon is third, with up to 1,400 m3/s volume running through the canyon as this section goes through Canyonlands National Park. Class III to V. Glen Canyon Dam is reliant on the releases from the dam that come seasonally, however this part can get up to V+. Trips down this river can take many days to complete, and full navigation, months. Dolores River Green River Gunnison River: Grand Canyon National Park has a much lesser known sister to the northeast in Colorado: Black Canyon of the Gunnison National Park, created in 1999 and thus as of 2021one of the youngest of all national parks. The Gunnison River drops about 34 feet per mile (10.4 m/1.6 km) in the canyon and thus has a steeper gradient than the portions of the Colorado that are normally rafted or kayaked. Rapids vary to class I to VI overall on the whole river and in the canyon itself the rapids get to V and up. Visitors must be highly skilled to raft the whole of the Black Canyon section. Kannah Creek Class V Los Pinos River North Platte River Roaring Fork River South Platte River Yampa River Idaho Kootenai River Lochsa River Middle Fork Salmon River - Class III-IV North Fork Payette River Salmon River main stem - Class III-IV Snake River Payette River main stem Illinois Vermillion River Minnesota Baptism River Devil Track