From the record
“The Parshallburg Bridge, also known as the Ditch Road Bridge, was a bridge that originally carried Ditch Road over the Shiawassee River near Oakley, Michigan. It was listed on the National Register of Historic Places in 1994.”
Wikipedia article Parshallburg Bridge, CC BY-SA 4.0.
One of 37 National Register listings published here for Saginaw County · listed in 1994 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service