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 151 while on the east side is the Arkansas River. After crossing the dam, the route ends at US-64/US-412 at another trumpet interchange, west of Sand Springs. Keystone Dam was completed in 1964. The dam was first shown as a state highway on the 1965 state highway map. No SH-151 shield was shown on this map, however; presumably it was omitted for space reasons. The highway would remain unlabeled on the official state maps until the 2008 edition. Oklahoma State Highway 151 State Highway 151 (abbreviated SH-151 or OK-151) runs across Keystone Dam in northeastern Oklahoma. Its entire length is within