Okla. Stat. tit. 19 § 1236
If the record title holders of more than sixty percent (60%) of the area of the land liable to assessments for any improvement petition the county commissioners of such county for the improvement of any road, street, alley, lane, or avenue, or part thereof, not less than six hundred (600) feet in length, the petition shall describe the character of the improvement desired, the width of the same, and the materials preferred by the petitioners for such improvement. The petition shall show the petitioners are the record title holders of the land liable for assessment and shall include a plat of the area to be assessed which shows the area of each parcel of land to be assessed on a pro rata basis of the entire area to be assessed, the preliminary plans, typical sections, and estimates. The notice providing for determining the necessity of such improvements shall not be published as provided in Section 1234 of this title.
The finding of the board of county commissioners as to the sufficiency of any such petition shall be conclusive and binding for all purposes, including prohibiting protest or objection to such improvement, and against all persons. The board shall have the power to have hearings on said petition and compel the attendance of witnesses under oath to determine the sufficiency of said petition, and no action or suit to question the findings of the board on the sufficiency of said petition shall be commenced later than fifteen (15) days after such finding. Upon finding the petition sufficient, the board shall cause such improvements to be made in accordance with the prayer of said petition as nearly as may be practicable.
Okla. Stat. tit. 19, § 1236