AMP: Salmon River Hwy #39/23 Location: OR 18 and OR 22, Polk Cty Reassurance shield as 22 joins 18. AMP: 23 Location: OR 18 and Rowell Creek Rd, Polk Cty Reassurance shield three quarters of a mile later as we cross the South Fork of the Yamhill River again. AMP: 26 Location: OR 18 and OR 18 Business, … Continue reading Oregon Route 18, OR 22 to OR 22/OR 18 Bus