AMP: 15 Location: I-90 and WYO 339, Sheridan Cty Just after the WYO 345 interchange, we’ll come to WYO 339 AMP: 16 Location: I-90 and WYO 339, Sheridan Cty Exit for WYO 339, which is a quick connector to WYO 338, a route that runs from Sheridan towards Decker, Montana S to I-90/I-90 Bus/US-14/US-14 Bus, … Continue reading U.S. Route 87, WYO 345 to WYO 339