An adventure of a lifetime! Mack`s Inn Resort provides float trips for a memorable adventure down the North Fork of the Snake River, Henry`s Fork. Mack`s Inn Resort is privileged to have a contract with the United States Forest Service to launch at the Big Springs boat launch to provide float trips on this unique section of the Snake River. Our friendly staff will transport float rentals, equipment and guests to the launch area at Big Springs Boat Launch. During the five-mile float, views of the mountains contrast the crystal-clear waters. The River remains a constant 52 degrees year around. Guests have seen moose, elk, deer, trout, Kokanee Salmon (in fall), eagles, swans and more.