Deep open spot along snowmachine trail at lower end of Hotcake Slough No flash player has been set up. Please select a player to play Flash videos. Video not playing? Update your browser or download the video clip Knut Kielland emphasizes how close this five foot deep open spot is to the main snowmachine trail, and how important it is to stay on the main trail. Process Observed: Open Water (Hidden) Date Process Observed: Saturday, March 31, 2012 Galleries: Main part of the Tanana River at lower end of Hotcake Slough Gallery