Deh CHO Drum - Construction of the ice crossing over the Liard River at Fort Simpson.Rufus Deneyoua checks the ice depth using a stick with a hooked piece of metal on the end while Ernest Deneyoua watches.NNSL photo/Roxanna Thompson Deh CHO Drum - Construction of the ice crossing over the Liard River at Fort Simpson.Rufus Deneyoua checks the ice depth using a stick with a hooked piece of metal on the end while Ernest Deneyoua watches.NNSL photo/Roxanna Thompson