AMP: 1 Location: 1st Ave and Big Timber Loop Rd, Big Timber A couple blocks later, keep right to stay on the business loop. Stay straight for US 191, which will resume its northward trek. AMP: 1 Location: 1st Ave and Big Timber Loop Rd, Big Timber Follow 191 to Harlowton. Stay on the I-90 Business loop … Continue reading U.S. Route 191, S-298 to I-90 Bus