From the record
“The Mill Springs Mill, located off Kentucky Route 90 at Mill Springs in Wayne County, Kentucky, is a historic watermill built in 1877. It was listed on the National Register of Historic Places in 1973.”
Wikipedia article Mill Springs Mill, CC BY-SA 4.0.
One of 7 National Register listings published here for Wayne County · listed in 1973 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service