AMP: Siskiyou Hwy #273/0 Location: OR 273 and OR 66, Jackson Cty The sole Oregon 273 shield is located about 6 inches into the route. AMP: 3 Location: OR 273 and Steinman Dr, Jackson Cty It’s a pretty cool drive, along old US-99 over Siskiyou Pass. In this spot, the highway actually loops around on itself, with … Continue reading Oregon Route 273, OR 66 to I-5