From the record
“The McDonald Ranch is a historic ranch complex located 14 miles (23 km) southwest of Chugwater in Laramie County, Wyoming. Donald McDonald, a Scottish immigrant, founded the ranch in 1881.”
Wikipedia article McDonald Ranch, CC BY-SA 4.0.
One of 60 National Register listings published here for Laramie County · listed in 1987 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service