AMP: Lafayette Hwy #154/0 Location: OR 233 and OR 18, Yamhill Cty Oregon 233 takes over Highway 154 from OR 154, and then quickly approaches OR 18. AMP: 0 Location: OR 233 and OR 18, Yamhill Cty Follow 18 west to McMinnville. 233 north will concur with 18 east towards Dayton and Newberg.  N to OR 221, … Continue reading Oregon Route 233, OR 154 to OR 18