The 1926-1970s working alignment
The Glenrio section of Route 66 was part of the original 1926 designation of the highway, which connected Chicago to Los Angeles via a 2,448-mile alignment crossing eight states. Through the Texas Panhandle, Route 66 ran from Texola at the Oklahoma border west through Shamrock, McLean, Groom, Conway, Amarillo, Bushland, Wildorado, Vega, Adrian, and Glenrio at the New Mexico border. The Glenrio crossing represented the western terminus of the Texas portion and the eastern entry point into New Mexico, making the small settlement a natural stopping point for travelers crossing the boundary.
The original 1926 alignment was paved progressively across the late 1920s and 1930s as part of the federal-state Route 66 improvement program. The Glenrio concrete roadbed visible today is consistent with 1930s-era construction — typical mid-century U.S. highway concrete paving, with expansion joints at regular intervals, a crown for drainage, and the standard 22-24 foot width that Route 66 used through this period. The pavement was maintained continuously through the 1940s, 1950s, and 1960s as the active Route 66 alignment, with the standard routine resurfacing and maintenance that working highways receive.
The decommissioning of Route 66 happened progressively across the 1960s and 1970s as Interstate 40 was constructed parallel to the old alignment. The Glenrio section was bypassed in the 1970s, with through-traffic shifted to the new Interstate a few miles north. The original Route 66 alignment through Glenrio was then left in place as a frontage road or as an undeveloped historic feature, with no further routine maintenance but also no demolition or reconstruction. The preservation that you see today is essentially the result of benign neglect — the road was abandoned in place rather than torn up.
