AMP: 346 Location: US-20 and Bridge St, St Anthony Reassurance shield after the St Anthony exit. AMP: 347 Location: US-20 and US-20 Business, Fremont Cty A mile or so later, turn left for the business loop back into St Anthony. Follow 20 to Ashton and W. Yellowstone, MT. The expressway more or less ends here.  E to … Continue reading U.S. Route 20, US-20 Bus to US-20 Bus