There will be single lane closures at the north and south approach ramps to the Hood River-White Salmon Interstate Bridge on Tuesday morning.  The closures will begin at 9:00 a.m. on Tuesday, and continue until noon.  Flaggers will direct traffic around the moving work zone, as surveying crews perform surveys related to future asphalt overlay repairs.  Motorists should expect delays of 15-20 minutes during these hours, depending on traffic volume.