Okla. Stat. tit. 69, § 69-638: Hard surfacing farm-to-market roads - Conditions

When any county road within the state, which shall have been

designated as a part of the federal aid secondary highway system, is

brought to standard grade and drain by the county in accordance with

plans and specifications approved by the Commission, and where

sufficient right-of-way is provided by the county wherein the road

is located, and where state and federal funds are available, such

road shall be hard surfaced by the Department.