AMP: Corvallis-Newport Hwy #33/49 Location: Main St and OR 34, Philomath Just as 34 joins 20, we’ll enter Philomath. AMP: 50 Location: Main St and OR 34, Philomath Keep right for 20/34 to fork onto the eastbound portion of the one way couplet through town. AMP: 50 Location: Main St and 15th St, Philomath A few blocks later, … Continue reading U.S. Route 20, OR 34 to OR 34/OR 99W