The bridge is officially called the Captain William J. Hudson "Steamboat Bill" Memorial Bridge.
Photo taken by James McCray
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BH Photo #111714
That's an unusual design. I don't recall seeing other bridges that gradually transition from a through truss to a deck truss. I wonder why they did it.
Actually, it is the 1999 bridge that replaced the Helen Keller drawbridge. Steamboat Bill supplemented the drawbridge and carried northbound U.S. 31/eastbound U.S. 72A traffic until the newest bridge was built; it now is the southbound/westbound crossing.