Okla. Stat. tit. 11, § 11-36-404: Hearing - Correction and confirmation of apportionment

- Right of action.

At the hearing on the assessment and apportionment, the

governing body shall give full opportunity to hear any and all

protests that may be urged against the levy of assessments for the

cost of the improvement and shall have the right to hear witnesses

until a full and complete hearing shall be had thereon. The

protests shall be in writing, specifically setting forth the nature

of the objection raised. After the conclusion of the hearing, the

governing body shall adjudicate the objections and may make such

order on the levy of assessments as may be just and proper. Any

objection shall be deemed waived unless presented at the time and in

the manner prescribed herein. Any owner of land liable to

assessment shall have the right to institute an action to contest

the validity of the amount of the assessment at any time within ten

(10) days after the final adjudication thereof by the governing

body, but no suit may be maintained to contest the validity or the

amount of the assessment, or any other matter pertaining to the

proposed improvement after the expiration of the ten-day period.