 Rivers in Boise National Forest offer the opportunity for rafting and <unk> through rapids up to class four , with the most difficult sections on the South Fork and main stems of the Payette River . Numerous developed boat launch sites provide access to rivers for whitewater enthusiasts , and <unk> Falls is the primary launching site for visitors to the Middle Fork of the Salmon River and Frank Church River of No Return Wilderness . <unk> boating is permitted on Anderson Ranch Reservoir , Deadwood Reservoir , and Warm Lake . 
