Leonard P. Zakim Bunker Hill Memorial Bridge Boston, Massachusetts Boston span boasts plenty of function behind its graceful form As final design consultant and engineer of record for the Leonard P . Zakim Bunker Hill Memorial Bridge, HNTB was responsible for plans, specifications and estimates, as well as the demolition of the structure that previously stood in its place. The three-span bridge features a 745-foot main span. At 185 feet, it is the world’s widest cable-stayed bridge and the first asymmetrical cable-stayed bridge in the United States as two northbound lanes are cantilevered outside the east cable plane. The bridge also is the first major hybrid cable-stayed bridge in the United States, using steel in the main span and concrete in the back span.

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