From the record
“Midway Bridge near Johnstown, North Dakota is the only bedstead bridge known to have been built in North Dakota. It appears to have been built locally, not as part of a state or county program, during the 1920-1930 period.”
Wikipedia article Midway Bridge (Johnstown, North Dakota), CC BY-SA 4.0.
One of 79 National Register listings published here for Grand Forks County · listed in 1997 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article