decommissioned through Oklahoma in the early 1980s. SH-66 was designated as its replacement from El Reno to White Oak on April 1, 1985. The remainder of US 66 in Oklahoma was overlapped by other highways, principally I-40 and US-69, so the SH-66 designation was not applied to these sections of highway. On July 1, 1991, SH-66 was realigned in the vicinity of Luther. No further changes to the SH-66 designation have occurred since that time. Planned improvements by the Oklahoma Department of Transportation include reconstruction and widening of SH-66 from two to four lanes from Edmond to the Lincoln County line. SH-66B While US 66 was still active, the SH-66 designation was given to a loop route through Wellston. This incarnation of SH-66 effectively served as a Wellston business loop for US 66. This route was first established on June 26, 1934. SH-66B is long. Junction list See also U.S. Route 66 U.S. Route 66 in Oklahoma K-66 References External links SH-66 at OKHighways 066 Transportation in Oklahoma City Transportation in Canadian County, Oklahoma Transportation in Oklahoma County, Oklahoma Transportation in Lincoln County, Oklahoma Transportation in Creek County, Oklahoma Transportation in Tulsa County, Oklahoma Transportation in Rogers County, Oklahoma Transportation in Craig County, Oklahoma U.S. Route 66 in Oklahoma