Whitewater Rivers in and near the Wallowa Mountains, Oregon 1   Salmon River Class II-IV - 50 miles long (White Bird to Snake River confluence) Idaho County 2   Snake River Class III-IV - 32 miles long (Hells Canyon Dam to Pittsburg Landing) Wallowa County 3   Wildhorse River Class III-IV - 14 miles long (Bear Creek Bridge to Snake River confluence) Adamas County