Okla. Stat. tit. 69, § 69-1206: Rights-of-way not secured by negotiation - Offers -

Costs.

In any or all of the above cases where local units of government

are required to pay or participate in the cost of right-of-way and

such right-of-way cannot be secured by negotiation, the state and

the local units of government involved shall agree upon a fair and

reasonable offer to be made for the right-of-way and, should the

eventual cost thereof exceed the offer, the excess shall be borne

with the local units of government involved, in proportion to their

respective obligations in the purchase of such right-of-way, and

shall be computed on the basis of each tract separately.