The National Park Service is doing work on three bridges on the Mount Vernon Trail between Dyke Marsh and the stone bridge. Today, they closed off a short section of the trail in anticipation of replacement of a short bridge. Additional work is on-going on Northdown Road, which now has one layer of new pavement. West Boulevard Drive, which runs parallel to the MVT from the stone bridge at Alexandria Avenue and Collingwood Road, is being torn up and re-paved. Despite all the work, the trail is still passable.