Home / River Trips/High Adventure Whitewater Trips River Trips High Adventure Whitewater Trips Explore ARTA’s high-adventure whitewater trips, featuring exciting Class IV and V rapids, big water, challenging terrain, and remote wilderness for the ultimate whitewater experience. States Idaho Oregon California-Yosemite Days 1 2 3 4 6 Difficulty Class III Class III+ Class IV Class IV+ Class V- June, July, August Selway River Rafting Idaho Length 6 days Difficulty Class IV Price per Person Starts at $4,500 Book Now Learn More Wild and Scenic May - Sept Middle Fork of the Salmon River Idaho Length 6 days Difficulty Class III+/IV Price per Person Starts at $3,099 Book Now Learn More Wild and Scenic April - May Illinois River Rafting Oregon Length 4 days Difficulty Class IV+/V- Price per Person Starts at $1,899 Book Now Learn More Wild and Scenic April - June Merced River Rafting California-Yosemite Length 1 day Difficulty Class III & IV Price per Person Starts at $190 Book Now Learn More Yosemite River Rafting April - Aug Tuolumne River Rafting California-Yosemite Length 1, 2 or 3 days Difficulty Class IV+ Price per Person Starts at $342 Book Now Learn More Yosemite River Rafting Fourteen Rivers, Infinite Possibilities! Explore all of our destinations. Explore