Demolition, drawbridge: Drawbridge on Potomac River: From background to foreground is (1) New 4 lane highway/bridge, with white painted steel drawbridge sections, (2) 4 lane highway/bridge under construction, with stub end sections of new drawbridge, and (3) partially demolished drawbridge section from old bridge. To either side of ship passage /drawbridge area are the concrete support structures for drawbridges. areas. These consist of large hollow bridge piers for old bridge and massive triangular structures for new bridge. Woodrow Wilson Bridge Project at George Washington Street, Alexandria, Virginia, November 2006.