North and a little west of Tok, in the Yukon - Charley Rivers National Preserve, and the 40 Mile River offer landscapes of high tundra.
We recommend booking early and planning your trip for the last week of May and the first part of June when the river is still flowing with spring run-off and the mosquitoes are not as bad as later in the year. During seasons of low water volume, portage may be required when starting at Three Fingers. You can arrange a pick up on a Yukon River gravel bar, or float for another day or two down the Yukon River into Circle. The Charley River has a gradient of 31 feet per mile and is considered by many to be one of the premier whitewater experiences in interior Alaska.