Chilson Bridge - Credit: Wikimedia Commons
The Chilson Bridge, near Edgemont, South Dakota, is a bridge which brings a local road, formerly U.S. Highway 18, over BNSF railroad tracks. It was built in 1929 and was listed on the National Register of Historic Places in 1993. It has also been denoted as South Dakota Dept. of Transportation Bridge No. 24-162-102 Read more on Wikipedia
Source: en.wikipedia.org