From the record
“The Westgaard Bridge, also known as Souris River Bridge, near Voltaire, North Dakota is a Pratt pony truss through structure that was built in 1902 to cross the Souris River. It was listed on the National Register of Historic Places in 1997.”
Wikipedia article Westgaard Bridge, CC BY-SA 4.0.
One of 10 National Register listings published here for McHenry County · listed in 1997 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

