The Oregon Department of Transportation says starting the first weekend after Labor Day, The Dalles Bridge will be closed from Thursday nights at 8 p.m. to Monday mornings at 6 a.m.  The closures will occur every weekend until Memorial Day of next year.  ODOT says the full weekend closures are needed to facilitate a bridge deck replacement project.  The Biggs Junction Bridge will provide access across the river during closure times.   ODOT says various closure options were considered for the bridge work, including an option that would have closed the bridge for 6 months or more.  After talking with stakeholders including law enforcement and emergency service providers, it was decided that weekend closures would have the least impact on bridge users.  ODOT has worked with the Corps of Engineers to allow emergency vehicles to cross the dam at The Dalles when the bridge is closed and impassible.