AMP: Salmon River Hwy #39/50 Location: OR 18 and OR 233, Yamhill Cty Reassurance shield as 233 joins 18. AMP: 50 Location: OR 18 and OR 221, Yamhill Cty Less than a mile later, we’ll get advance signage for OR 221. AMP: 51 Location: OR 18 and OR 221, Yamhill Cty Keep right ahead for Oregon 221 south. … Continue reading Oregon Route 233, OR 18 to OR 221