its two branches are also runnable but difficult to reach and navigate. In particular, portages on the South Branch route, which includes lakes and a segment of the Tyone River, are "arduous". Hazards on these streams include Canyon Rapids, rated Class III to IV (difficult to very difficult) on the main stem, isolation, cold water, logjams, overhanging or submerged vegetation, portages of varying difficulty, and powerboats on the lower river. See also List of rivers of Alaska References External links Gulkana Wild and Scenic Rive – Bureau of Land Management page Map of the Gulkana River system – Bureau of Land Management Rivers of Alaska Rivers of Copper River Census Area, Alaska Rivers of Southeast Fairbanks Census Area, Alaska Rivers of Unorganized Borough, Alaska Wild and Scenic Rivers of the United States