Andy: You are right. It was used as the backdrop when the sheriff and his deputies were chasing the man suspected of killing the industrialist who was going to build a factory in Sparta, Mississippi.
If I am correct this bridge was used in a scene of the movie "In the Heat of the Night," during which a prisoner is seen being being chased from "Mississippi" into "Arkansas".
The movie is set in the town of Sparta, Ms., which in the movie the town of Sparta, Il. was where the filming took place.