AMP: Corvallis-Newport Hwy #33/44 Location: US-20 and OR 223, Benton Cty No reassurance shield after the 223 junction. AMP: 49 Location: US-20 and OR 34, Benton Cty As we approach Philomath, we’ll come to a junction with Oregon 34. AMP: 49 Location: US-20 and OR 34, Benton Cty Turn right ahead for 34 west. 34 east joins US-20 … Continue reading U.S. Route 20, OR 223 to OR 34