AMP: Parma Spur Hwy #489/15 Location: OR 452 and Old SH-18, Malheur Cty No reassurance shield as Oregon 452 begins. 452 takes over for what was once Idaho SH-18, which went up to Parma via Roswell. AMP: 13 Location: OR 452 and OR 454, Malheur Cty A little over a mile later, we’ll approach Oregon 454. Stay … Continue reading Oregon Route 452, ID State Line to OR 454