From the record
“The Belle Fourche Dam, also known as Orman Dam, is a dam on Owl Creek in Butte County, South Dakota, USA, approximately 8 miles (13 km) east of Belle Fourche, South Dakota, along U.S. Its construction created the Belle Fourche Reservoir, the Belle Fourche National Wildlife Refuge, and the Rocky Point Recreation Area.”
Wikipedia article Belle Fourche Dam, CC BY-SA 4.0.
One of 39 National Register listings published here for Butte County · listed in 1977 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service