AMP: 113 Location: US-191 and SR 366, Graham Cty A few miles after 266, we’ll approach SR 366 AMP: 113 Location: US-191 and SR 366, Graham Cty Stay on 191 for Safford. Follow 366 to Mt Graham, its primary destination, as well as Swift Trail and the Federal Prison AMP: 113 Location: US-191 and SR … Continue reading U.S. Route 191, SR 266 to SR 366