The Dey Road Bridge is a historic truss bridge that spans the Tiffin River near the city of Defiance, Ohio, United States. Built in the 1900s, it has been designated a historic site.In 1835, an early toll bridge across the Tiffin was built at the nearby community of Brunersburg, but it was soon destroyed by a flood. The current bridge is a Pratt through truss bridge that was manufactured by the Massillon Bridge Company and built in 1906.