A project to reduce the threat of rockfalls on the south side of Interstate 84 west of Hood River gets underway Tuesday.  Work will last until next spring.  The project will mean the eastbound right lane at milepost 61 west of Hood River will be closed until November 21, but there will be no impact on the westbound lanes.  Bicyclists may continue to use the eastbound shoulder during construction but should use caution in the work area.  The project will improve slope stability and install a 12-foot high, 223-foot barrier to reduce the potential for rocks falling onto the highway.  The project will also remove loose rock from the hillside and install rock bolts and horizontal drains to improve long-term slope stability.  In February 2014, a large rockfall at that location blocked the eastbound lanes for five days.