October 13, 1984: the last bypass
The October 13, 1984 bypass of Williams is the date that effectively ended Route 66 as a continuous federal highway. The previous decades had seen Interstate 40 gradually replace Route 66 across Arizona, New Mexico, Texas, and Oklahoma — town by town, segment by segment — with each bypass generally completed when federal-state funding aligned and local opposition (if any) was resolved. By the early 1980s, Williams was the only remaining Route 66 town in the United States where the original alignment still served as the primary through-highway.
The Williams holdout was driven by several factors. Local business owners along Bill Williams Avenue, who depended on Route 66 traffic for their motels, restaurants, and gas stations, filed legal action against the federal and state highway authorities to delay the bypass construction. The legal challenges produced several years of delay through the late 1970s and early 1980s. Additionally, the surrounding geography — Williams sits at the base of Bill Williams Mountain in a basin formed by surrounding ponderosa pine forest — made the bypass construction more expensive and topographically complicated than typical Interstate 40 segments.
The bypass was eventually completed and opened on October 13, 1984. The exact moment is documented in local newspaper coverage and in the photographs that hang on the walls of several Williams restaurants and the visitor center. The official Route 66 designation through Williams was decommissioned that day, and the remaining stretch of Bill Williams Avenue technically became a state-numbered alternate route. But the cultural significance of being the last Route 66 town has defined Williams' tourism identity for the four decades since.