(Cougar, WA)  --  The search is over for the body of an Oregon hiker missing for three weeks near Mount St. Helens.  Authorities say 18-year-old Kelso resident Garrett Canada was reported missing in mid-October.  His body was found over the weekend east of the town of Cougar by a group of camping Girl Scouts.  OregonLive reports that he fell into water near a Lava Canyon waterfall while he was hiking.