Its a three-span bridge with a 310 ft lift span supported on 210 ft high towers and a 770 ft total length. In the closed position the deck has a 55 ft vertical clearance over the Harlem River and in the open position it is 135 ft above the river. The bridge carries six lanes of traffic and two sidewalks. It was originally going to be the world's heaviest lift bridge, but the designer, Othmar Ammann was able to reduce its weight by such means as replacing the concrete deck with asphalt on a steel deck. The Triborough Bridges were opened to traffic in 1936.
New York City's Bridges: Triborough Lift Bridge by Mark Yashinsky is licensed under a Creative Commons Attribution 3.0 United States License.