AMP: 52 Location: Tongue River Rd and S-314, Big Horn Cty Reassurance shield at the beginning of S-566 as I begin to clinch this highly remote 52 mile long unpaved highway in a 2WD vehicle in winter. AMP: 41 Location: Tongue River Rd at the Rosebud County Line, Big Horn Cty On a highway like this, … Continue reading Montana Secondary Highway 566, S-314 to US-212