ABEC's Alaska Adventures Offers hiking, backpacking, canoeing, and rafting trips in Alaska. http://www.abecalaska.com/

Absolute Rafting Adventures River rafting, cycling, and fishing excursions, tours, and more. http://www.absolute-rafting.com/

Ace Ocoee Funyaks Offers whitewater funyak trips down the Ocoee River. http://www.acefunyaks.com/

Ace Whitewater Whitewater river rafting outfitter on the New and Gauley Rivers in West Virginia. Also operates a 1400 acre resort with climbing, horses, and mountain biking. http://www.aceraft.com/

Action Whitewater Adventures Whitewater raftingtrips on Idaho's Main Salmon, Middle Fork, Grand Canyon, American, Kern, Green, Tuolumne, and Rogue rivers. http://www.riverguide.com/

Adirondac Rafting Co. Runs whitewater rafting trips on the Hudson River Gorge. http://www.lakeplacidrafting.com/

Adrift Adventures River Rafting Vacation rafting trips. http://www.adrift.net/

Adventure Connection Offers a variety of packages on rivers throughout California. http://www.raftcalifornia.com/

Adventure Discovery Tours Provides guided trips down the San Juan river. http://www.rivertrips.net/

Adventure Sports Rafting Company Offers whitewater rafting tours on the Hudson River Gorge and Moose River in the Adirondacks of New York. http://www.hudsonriverrafting.net/

Adventures Wild, LLC Offers rafting trips on the Main Salmon River, Idaho. http://www.adventureswild.com/

Aggipah River Trips Offers wilderness float trips on the Salmon River. http://www.aggipah.com/

Ahwahnee Whitewater Offering trips on the Tuolumne, Merced, Cherry Creek, East Fork Carson, and other California rivers. http://www.ahwahnee.com/

Alaska River Rafters Offers wilderness river adventures in Alaska that go from the mountains to the sea. http://www.alaskarafters.com/

All Star Rafting and Kayaking Offers whitewater rafting, kayaking, fishing, and lodging on the Deschutes River. Also offers raft rentals on the Clackamas and other rivers. http://www.asrk.com/

Alpine Adventures River Rafting Tours Offers whitewater river rafting and scenic river raft floats from Leavenworth, Washington. http://www.alpineadventures.com/

Amazonas Explorer Rafting and canoeing in Peru, Bolivia and Chile. http://www.amazonas-explorer.com/

American River Recreation Offers half to three day whitewater rafting trips on the American and Merced rivers of California. http://www.arrafting.com/

American Whitewater Expeditions Offers rafting adventures for Class III, IV, and V rapids on the American River of California. http://www.americanwhitewater.com/

Appalachian Adventures and Rafting Offers family trips on the New River and Gauley River, plus lodging and local information. http://www.aaarafting.com/