(Marion County, OR) -- A 13-year-old is dead after an accident at the Elkhorn Valley Campground in Marion County. The County Sheriff's Office says the teenager was swimming with friends when the 13-year-old went underwater and didn't resurface. Deputies and fire crews responded to the campground around 4:15 Sunday afternoon. The teen's body was found around 6:15 by on-scene rescue personnel before the arrival of the dive team.