Frawley Ranch, National Historic Landmark ranch near Spearfish, South Dakota

Frawley Ranch is a historic cattle ranch near Spearfish in Lawrence County, South Dakota. Henry Frawley assembled it from more than 3,000 acres of failed homestead parcels, organized as the Upper, Lower, Middle and East farms, and by 1913 it covered over 4,783 acres. The property includes the Anderson dairy with its brick barn and a school, and was declared a National Historic Landmark in 1977.

Patrick Henry Frawley, a lawyer from New York, reached Deadwood in 1877 and married Cristina Anderson in 1890, heir to the Centennial Farm between Deadwood and Spearfish. He bought up failed homesteads, and by 1913 held over 4,783 acres in four farms, raising Belgian and Percheron draft horses and Hereford cattle. The ranch was named a National Historic Landmark in 1977.

The former Centennial Valley Schoolhouse on the property taught children from the area between 1880 and 1936 and later served as a meeting place for the community. This preserved building shows how education and community life were essential to people living in this remote region.

The property now operates as part of Elkhorn Resort, offering guest cabins, an RV park, a golf course, and facilities for events. Visitors can explore the historic grounds and see the preserved buildings set within the natural landscape of Centennial Valley.

Underground tunnels were built beneath Interstate 90 in 1968 to allow livestock to move between the two sides of the ranch when the highway divided the property. This unusual solution shows how the ranch adapted when modern highways cut through the historic land.