The board of county commissioners of any county may, under the direction of the Commission, contract for grading, draining or hardsurfacing any street within any municipality where such street is a continuation of or a connecting link in the State or County Highway System or if the county and the municipality have entered into an agreement pursuant to Section 36-113 of Title 11 of the Oklahoma Statutes for the construction, improvement, repair or maintenance of municipal streets.
Okla. Stat. tit. 69, § 603