(Troutdale, OR)  --  The Multnomah County Sheriff's Office is urging river swimmers to wear lifejackets after two drownings in the Sandy River last week.  On Wednesday, a stand-up paddler drowned near Oxbow Park and on Friday a swimmer drowned near Dabney State Park.  Also last week, a family of three had to be rescued after being swept away by the current.  They were taken to a hospital for evaluation.  Free life vests are available at parks along the river and lifeguards are on duty at Glenn Otto Park in Troutdale.