Demolition, drawbridge: Demolition view of bascule drawbridge on Potomac River, in open position, but with the draw bridge leaves (beams and road deck) cut off; leaving the geared rotating base (circled in gray). A bascule draw bridge has counterweights (circled in blue) on back side of draw bridge leaves so that raising the leaves and opening the bridge to allow ships to go through uses very little power/ energy. Woodrow Wilson Bridge Project at George Washington Street, Alexandria, Virginia, November 2006.

Demolition, drawbridge: Demolition view of bascule drawbridge on Potomac River, in open position, but with the draw bridge leaves (beams and road deck) cut off; leaving the geared rotating base (circled in gray). A bascule draw bridge has counterweights (circled in blue) on back side of draw bridge leaves so that raising the leaves and opening the bridge to allow ships to go through uses very little power/ energy. Woodrow Wilson Bridge Project at George Washington Street, Alexandria, Virginia, November 2006.