Location: I-25 and 2nd St, Colfax Cty Reassurance shield after the Raton loop rejoins as we begin our ascent up Raton Pass into Colorado Location: I-25 at the Colorado Line, Colfax Cty Welcome to Colorado! US-85 continues with the interstate until the Springs, leaving it for good in Denver. N to CO-12, S to NM-72 S … Continue reading U.S. Route 85, I-25 Bus to CO State Line