Okla. Stat. tit. 19 § 1235
Any record title holder of property or other person interested in such proposed improvement shall have the right to institute an action to contest the action of the board of county commissioners of such county in adopting and approving the plans, plats, typical sections, or estimates filed by the engineer in the district court of the county in which a road improvement district is located at any time not later than fifteen (15) days after publication of the resolution provided for in Section 1234 of this title. Any suit instituted after the expiration of said fifteen (15) days shall not be maintained to question such plans, plats, typical sections, or estimates and the record title holders of property liable for assessment shall be deemed to have waived all objections to such proposed improvement.
Okla. Stat. tit. 19, § 1235