wharfrat3

We didn't go here, instead we went to the real center on the country. Go north out of Belle Fourche about 15 miles on US 85. Turn left onto Old Hwy 85 and go about 7.5-8 miles.
On the right, in a filed, you'll see an American flag. And 2 USGS markers, one from 1959, the other from 1962, marking the spot.
If you're travelling on US 85, it's a nice detour.