Changes at mouth of Chena River 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 Sam Demientieff talks about changes in conditions through the years of visiting this site at the mouth of the Chena River. Process Observed: Changes in River Channel Date Process Observed: Saturday, March 31, 2012 Galleries: Mouth of the Chena River Gallery