The Oregon Department of Transportation says the Interstate 84 off-ramp at milepost 82 west of The Dalles is closed due to a grass fire at that location.  ODOT reports the fire may cause minimal delays on the freeway, so caution is advised.  The fire started around 2:30 p.m.  Mid-Columbia Fire and Rescue crews are at the scene, but no other details are available at this time.