From the record
“The Hildebrand Mill on Flint Creek in Colcord, Delaware County, Oklahoma was built c. 1845 and served hill people of the Old Cherokee Nation territory for more than 125 years. It is located not far from Siloam Springs, Arkansas.”
Wikipedia article Hildebrand Mill, CC BY-SA 4.0.
One of 6 National Register listings published here for Delaware County · listed in 1972 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service