(Multnomah Co., OR)  --  Officials say they've suspended their search for a Portland woman who vanished while on a hiking trip in the Columbia River Gorge.  Twenty-one-year-old Anna Schmidt was last seen October 16th by her roommate and was reported missing Wednesday.  Search-and-rescue teams covered more than 150 miles of trail in the Gorge, and drones were deployed to aid in the search.  The Multnomah County Sheriff's Office says efforts to find Schmidt will resume once crews establish credible leads.