Montana Whitewater Rafting is at its best on the Alberton Gorge. From May through September, there’s plenty of whitewater. Big waves and rollicking fun for everyone. Experience Montana Whitewater rafting at its best on the Alberton Gorge. Raft Montana’s finest whitewater on the Alberton Gorge, enjoy our scenic family floats for relaxing and wildlife viewing or try river boarding, the ultimate whitewater thrill. Montana River Guides invites you to discover Montana’s finest river adventures and river board trips on the Clark Fork River, the Blackfoot River and the Bitterroot River. Our friendly, professional river guides provide instruction, equipment and guidance for our raft, canoe, kayak, river board and SUP trips.