AMP: 47 Location: I-90 and River St, Superior Reassurance shield after S-257 as we head out of Superior. AMP: 55 Location: I-90 and Quartz Loop Rd, Mineral Cty Reassurance shield a few miles later. AMP: 57 Location: I-90 at Quartz Flats Rest Area, Mineral Cty Reassurance shield after a rest area. AMP: 61 Location: I-90 and Tarkio Rd, Mineral … Continue reading Interstate 90, S-257 to I-90 Bus/S-507