Okla. Stat. tit. 82 § 872
The district may, but without intending by this provision to limit any powers of the district as granted to it by this act, enter into and carry out such contract, or establish or comply with such rules and regulations concerning labor and materials and other related matters in connection with any project or projects as the District may deem desirable or as may be requested by the United States of America, or any corporation or agency created, designated or established thereby, which may assist in the financing of any such project or projects. The district shall have the authority to request engineering aid of the Corps of Engineers of the United States Army, the Federal Power Commission, or any other federal agency, in the designing and construction of any project authorized under the terms of this act and to use such aid, if and when offered, and to pay any reasonable cost therefor.
Okla. Stat. tit. 82, § 872