Okla. Stat. tit. 82, § 82-576: Cooperation with federal government or other agencies -

Outlets in other states.

The board of directors shall also have the right and authority

to enter into contracts or other arrangements with the United States

Government or any department thereof, with persons, railroad or

other corporations, with public corporations, cities and towns, and

the state government of this or other states with drainage

conservation, conservancy, or other improvement districts, in this

or other states, for cooperation or assistance in constructing,

maintaining, using and operating the works of the district or the

waters thereof, not in violation of Article VI of the Constitution

or for making surveys and investigations or reports; and may

purchase, lease or otherwise acquire land or other property in

adjoining states in order to secure outlets or spend money for

securing such outlets or reservoirs or other works in adjoining

states, and the Governor of the State of Oklahoma is hereby

authorized to assist any conservancy district in negotiating any

agreements with other states and the United States, under the power

conferred upon him by Section 8 of Article VI of the Constitution of

Oklahoma. That the streams constituting boundaries between this and

other states for more than one hundred (100) miles shall not be

organized within the conservancy districts until the state

governments of this and other states affected shall have executed

agreements as to equitable division of costs and benefits between

the areas with different states affected by the agreement.