Interstate 84 will be closed nights eastbound and westbound at exit 56 west of Hood River the next four nights, but delays may be minimal because the off-ramp leads directly to an on-ramp and a quick return to the highway.  The Oregon Department of Transportation says they closure will be in place Monday through Thursday nights from 8 p.m. to 7 a.m.  The work is weather-dependent, and unfavorable conditions could change the schedule.  Crews will resurface the bridge over the exit 56 interchange at Viento State Park and repair the bridge deck membrane.