Arlington Memorial Bridge emergency closures and load limits: As of Friday, May 29, 2015, the National Park Service, at the recommendation of the Federal Highway Administration, closed both curbside lanes across the drawbridge span of Arlington Memorial Bridge, which spans the Potomac River in Washington, D.C., and posted a 10-ton load limit across the entire length of the bridge. The lane closures will remain in effect until emergency repairs are complete. The load restriction, which will eliminate most bus (and large RV) traffic, will remain in effect indefinitely. From National Park Service.