Leonard P. Zakim Bunker Hill Memorial Bridge

Aerial view, looking north from the Prudential Tower, showing the bridge north of the Beacon Hill (foreground) with Bunker Hill at center left; The Leonard P. Zakim Bunker Hill Memorial Bridge in Boston, Massachusetts is the widest cable-stayed bridge built prior to 2003. The bridge is part of the Big Dig, the largest overall highway construction project in the United States, and replaced the Charlestown High Bridge. According to the Massachusetts Turnpike Authority's web site, the bridge has an overall length of 436.5 m, a main span of 227.1 m, side spans of 81.4 m (downtown side) and 128.0 m (Charlestown side), and towers that are 82.3 m tall. In a cable-stayed bridge, instead of hanging the roadbed from cables slung over towers, the cables run directly between the roadbed and the towers. Although cable-stayed bridges have become common in Europe since World War II, they are relatively new to North America. The bridge, designed by Swiss civil engineer Christian Menn, follows a new design in which two outer lanes are cantilevered outside the towers while another eight lanes run through the towers. It has a striking, graceful appearance that is meant to echo the towers of the Bunker Hill Monument, which is within view of the bridge, and the white cables of the USS Constitution. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 2/10/2008)