Okla. Stat. tit. 69, § 69-640: Use of road machinery by farmers

If there be located in any county less than six private operators

actively engaged and registered with the governmental bureau or

department having supervision of soil conservation, and available

for contracting for rendering soil conservation services, the board

of county commissioners may permit farmers in such counties to use

the county road machinery and equipment in constructing and

maintaining terraces and ditches in the county.