Ice collapse across snowmachine trail at upper end of Hadley Island Slough Large area of ice collapse near the slough outlet across from the upper end of Hadley Island Slough that has cut across the main snowmachine trail. Process Observed: Ice CollapseTravel Hazard Date Process Observed: Friday, March 30, 2007 Galleries: Slough outlet across from upper end of Hadley Island Slough Gallery