Ice collapse near upper end of Hadley Island Slough Close-up of a corner of the section of ice in the slough outlet across from Hadley Island Slough that has dropped (collapsed) and poses a hidden travel hazard. Process Observed: Ice CollapseTravel Hazard Date Process Observed: Friday, March 30, 2007 Galleries: Slough outlet across from upper end of Hadley Island Slough Gallery