(Vancouver, WA) -- Clark County Sheriff's detectives need help to find out more about an injured pedestrian they found Thursday morning in Hazel Dell. Just before 9 a.m., deputies and medics responded to the man found injured on Northeast Highway 99, near Minnehaha Street. He was taken to a hospital in serious condition. The Major Crimes and Traffic Units are investigating the circumstances and cause of his injuries. They ask anyone who saw an injured adult male in that area overnight to report it to the Clark County Sheriff's Office.