(Vancouver, WA)  --  A 20-year-old Sunriver man is dead after becoming trapped underwater while whitewater kayaking in Clark County.  The Clark County Sheriff's Office says Blaine Davis was kayaking with friends on Sunday when he became trapped in Canyon Creek where it flows into the Lewis River.  Police say Davis's friends pulled him from the water and attempted CPR, but he died at the scene.  Police say Davis was wearing a lifejacket and all the appropriate safety gear.