Okla. Stat. tit. 69 § 1004
Whenever circumstances alter the highway, road or street requirements or needs of a county or city, after such county or city has purchased or acquired by eminent domain, any strip, piece or parcel of land so that such property, or any part thereof, is no longer needed for such purposes, the board of commissioners of such county or the governing board of such city is authorized to sell all right, title and interest of the county or city in such real property as herein provided. Such property shall be disposed of in the manner set forth in Title 69, Oklahoma Statutes, Section 1001; provided, however, no such property which has been or is at the time of such disposal a portion of the State Highway System shall be offered for sale or in any manner disposed of by the county or the city unless notice in writing has first been given to the State Highway Director, and the State Highway Director has approved of such sale or other disposal of such property in writing.
Okla. Stat. tit. 69, § 1004