Oklahoma State Highway 66 Oklahoma State Highway 66 State Highway 66 (abbreviated SH-66) is a state highway in the U.S. state of Oklahoma, beginning at U.S. Highway 81 in El Reno and ending at U.S. Highway 60 near White Oak. The highway was designated in 1985 as a replacement for the decommissioned US-66. Although most of the highway follows Historic Route 66, the highway follows US-66's final alignment, joining Interstate 44 through Tulsa and Oklahoma City, while older versions of the route follow various city streets through both cities. The highway has retained its importance for most of its length due to its paralleling
Oklahoma State Highway 99 become a U.S. Route, while another suggested a northern terminus at US-64 near Cleveland. On June 18, 1964, AASHTO accepted an extension of US-377 from Texas to US-70 in Madill. The Department of Highways, and later the Department of Transportation, submitted an application to extend US-377 from Madill to US-64 in Cleveland eight times between December 1964 and 1980. In 1991, ODOT signed the route to Stroud along SH-99 without AASHTO approval. SH-99 has two lettered spurs: Oklahoma State Highway 99 State Highway 99, abbreviated SH-99, is a north–south state highway through central Oklahoma. It runs from the Texas border