Okla. Stat. tit. 19, § 19-902.18: Powers and duties concerning supervision and control of

county roads.

Nothing in this act shall be deemed to exclude a county from

supervision and control of the county roads in a district or to

relieve the county from any duty or obligation to improve and

maintain such county roads. The authority and powers of such

districts shall be in addition to those of the counties and shall be

carried out in cooperation with such counties.