Okla. Stat. tit. 19, § 19-1235: Contest of improvement

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.