Dey Bridge is a Pratt through truss built in 1906 by the Massillon Bridge Company of Toledo, Ohio, at a cost of $3,967.50, replacing a bridge built in 1882. Dey Road was petitioned for as a public road in 1832 in what was then Williams County by Samuel Dey, who owned the land north of the bridge. The bridge provided a vital Tiffin River crossing for 39 years before being replaced by the prestressed concrete bridge to the south in 1995 at a cost of 1,130,00o, and preservation was encouraged in 1997 through the Federal Highway Administration's enhancement program at a cost of $237,000. The Pratt through truss, the most popular through truss built on highways in the late 19th and early 20th centuries, has diagonals in tension and verticals in compression except for the hip verticals adjacent to the inclined end posts. This one-span bridge extends 170 feet, is 16 feet wide, is set on concrete abutments, has top chords and end posts composed of two channels, a top plate, and lacing, posts with two channels and lacing, and pin-connections like many bridges of its time.