Two teenagers were injured in a one-vehicle accident Friday evening on Highway 141 Alternate north of Underwood.  According to the Washington State Patrol, the car driven by an 18-year-old White Salmon woman was traveling northbound at milepost 6 when it veered onto the northbound shoulder, overcorrected, and rolled off the southbound embankment into the White Salmon River.  A witness said people helped pulled the teens up the cliff with a rope before emergency vehicles got there.  The WSP says both the young woman and a 16-year-old male from Hood River who was also in the vehicle were taken to Skyline Hospital in White Salmon for treatment of injuries.