Okla. Stat. tit. 27 § 12
Where an inverse condemnation proceeding is instituted by the owner of any right, title or interest in real property because of use of his property in any public program or project described in Section 1 of this act, the court, rendering a judgment for the plaintiff in such proceeding and awarding compensation for the taking of property, or the state's attorney effecting a settlement of any such proceeding, shall determine an award or allow to such plaintiff, as a part of such judgment or settlement, such sum as will, in the opinion of the court or the acquiring entity's attorney, respectively, reimburse such plaintiff for his reasonable costs, disbursements and expenses, including reasonable attorney, appraisal and engineering fees, actually incurred because of such proceeding. A determination by the court shall be appealable to the Supreme Court in the same manner as any other final order.
Okla. Stat. tit. 27, § 12