AMP: 157 Location: MT-200 and Melstone Rd, Petroleum Cty Reassurance shield after the S-500 junction. AMP: 135 Location: MT-200 and S-244, Petroleum Cty 20 miles later, we’ll approach S-244. Follow 244 down to Winnett. This route also serves as a shortcut for traffic heading down to Roundup and Billings from here. AMP: 135 Location: MT-200 and S-244, Petroleum … Continue reading Montana Highway 200, S-500 to S-244