Wet weather conditions this week are prompting an extension of the work schedule for the semi-annual bridge deck maintenance welding on the Hood River-White Salmon Interstate Bridge through December 5.  As weather conditions allow, there will be single-lane closures of the bridge from 9:00 a.m. to 3:00 p.m. weekdays through December 5.  The welding is done to repair cracks in the steel grate of the bridge deck.  The work must occur during dry, bright weather for visibility.  Flaggers will direct traffic on the bridge and motorists are urge to drive slowly for worker safety.  Motorists should plan for significant delays of up to 30  minutes in both directions during the daylight hours weekdays through December 5.