AMP: Salmon River Hwy #39/44 Location: OR 18 and OR 99W, Yamhill Cty Reassurance shield after the 99W junction as we start to bypass McMinnville to the south. AMP: 46 Location: OR 18 and Three Mile Ln, Yamhill Cty Reassurance shield after an exit into downtown McMinnville. AMP: 48 Location: OR 18 and Cruickshank Rd, Yamhill Cty A … Continue reading Oregon Route 18, OR 99W to OR 233