From the record
“South Dakota Dept. of Transportation Bridge No. 16-570-054 in rural Corson County, South Dakota was listed on the National Register of Historic Places in 1993.”
Wikipedia article South Dakota Dept. of Transportation Bridge No. 16-570-054, CC BY-SA 4.0.
One of 4 National Register listings published here for Corson County · listed in 1993 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service