The Foster Bridge in Ann Arbor, Michigan which was used as a case study and pattern for the student design exercise.

The Foster wrought iron bridge is shown above. The design was patented in 1876 by the Wrought Iron Bridge Co. of Canton Ohio. It is a simple one lane Pratt through bridge design with all truss work above the deck. The 120 ft [36 m] span is divided into 8 panels.

 

Dimensions of the Foster Bridge truss are given above.