Undercut snowdrift at end of sandbar bank Photo Credits: Chas Jones Undercut snowdrift on the end of a sandbar that is not visible from above. This could be dangerous if the drift were to collapse under a snowmachine when leaving the sandbar. Process Observed: SandbarSnow InsulationTravel Hazard Date Process Observed: Tuesday, March 16, 2010 Galleries: Snowdrift at sandbar bank Gallery