AMP: 0 Location: York Rd and Canyon Ferry Rd, Helena No reassurance shield at the beginning of the York Rd as we head out of Helena. 280 is unsigned from the mainline. AMP: 15 Location: York Rd and Black Bear Rd, York, Lewis and Clark Cty 15 miles later, we’ll enter the little community of York, which … Continue reading Montana Secondary Highway 280, S-430 to York