Tetra Tech INCA designed trunnion bearings, hydraulic machinery and associated control system for this innovative counterweightless trunnion-type bascule bridge. Because of the space restriction, the 81 foot long span was designed without the counterweight. It is lifted directly by the hydraulic machinery. The muscles of the machinery system are two 20-inch ID hydraulic cylinders. This bridge has two car traffic lanes, two bicycle paths, and a railroad track.

 Illinois Street Bridge (127.44 kB)
 

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