Role of sandbars in safe river travel Charlie Campbell, Knut Kielland, Bill Schneider and Ronnie Evans stand on top of a sandbar and talk about the role sandbars play in safe river travel, and how one has to be careful because the snowdrift can hide thin ice. Process Observed: SandbarSnow InsulationThin IceOpen Water (Hidden) Date Process Observed: Tuesday, March 16, 2010 Galleries: Snowdrift at sandbar bank Gallery