Okla. Stat. tit. 82, § 896.7

In order to assist in the public use and enjoyment of the scenic rivers, the Grand River Dam Authority, the Oklahoma Tourism and Recreation Department and the Department of Wildlife Conservation may acquire, develop and maintain public access points, easements or park areas in or near scenic rivers. Such acquisitions shall be by private treaty only, and the use of the power of eminent domain for these purposes is specifically prohibited.