South of Madill. A 1930 ODOT map seems to indicate this. Was it ever US 70?
Only if poo.
http://research.archives.gov/description/5836369
This diagonal grading too: http://maps.google.com/maps?ll=34.027219,-96.602826&spn=0.004055,0.008256&gl=us&t=k&z=18
And this dirt access road: http://maps.google.com/maps?ll=33.998805,-96.587762&spn=0.016224,0.033023&t=m&z=16&layer=c&cbll=33.998805,-96.587762&panoid=y2jfgNGstkCfAXvk837i3g&cbp=12,342.75,,0,6.87