The river is so rough in the Upper Kuskokwim area that it is impassable to vehicle and snow machine traffic. Big boulders of snow-covered ice are scattered across the river caused by high water and a late freeze up.
Due to consistent above average winter temperatures, there are many known and developing open holes on the river. I was on the trail working at the Bogus Creek Checkpoint. Most of the trail had no snow cover, and the majority of the race was run on glare ice over the tundra.
The Kuskokwim River now has its longest ice road ever, despite having the warmest winter on record.