To visit past Bridges of the month, click on the links above.

    The LaSalle Street Bridge in Chicago is one of many movable bridges spanning the Chicago River that surrounds the Loop area of the city.  It has a distinctive sloping look, as if forming a valley between two hills.  Built in 1928 of steel, it is a trunnion bascule bridge.  It is in essence a single leaf drawbridge.  The bridge is raised by means of a counterweight at one end.  Seen here are views of the bridge with the Merchandise Mart (to the left) and the Reid, Murdoch and Co. Building (just below).  Also pictured are details of the tower and the rivets, the latter forming an abstract pattern.