Ledge of thick ice with thin ice and open water behind at upper end of Wenrich Slough Sam Demientieff standing near the edge of a ledge of thick ice with thin ice and open water behind him at the upper end of Wenrich Slough below Wenrich Island. Process Observed: Ice ThicknessUnsafe IceOpen WaterThin Ice Date Process Observed: Monday, December 17, 2007 Galleries: Upper end of Wenrich Slough below Wenrich Island Gallery