AMP: 7 Location: WYO 257 and US 20, Natrona Cty Reassurance shield as WYO 257, the Casper West Belt, begins. This is the newest state highway in Wyoming, having opened in late 2015 as a westerly bypass around Casper. AMP: 0 Location: WYO 257 and WYO 220, Natrona Cty Several unremarkable miles later, we’ll approach WYO 220. … Continue reading Wyoming Highway 257, US-20/US-26/US-20 Bus/US-26 Bus to WYO 220