La. Roads, Bridges and Ferries § 48:893
Any parish operating under this Sub-part may cooperate with any political subdivision or agency of this state, or of an adjoining state in which a part of the bridge is or may be situated, in the acquisition, construction, improvement, operation, and maintenance of any bridge and in defraying the costs thereof. To this end, the parish may enter into any proper contract with any such political subdivision or agency, and two or more parishes may jointly issue revenue bonds as authorized in this Sub-part and create or establish a commission to accomplish the objective thereof, said commission to be composed and have such powers and authority as the parishes may deem advisable and may delegate to it, not contrary to law.
When the bonds issued, under the authority of this Sub-part, for any bridge and the interest thereon have been paid in full or sufficient funds have been deposited in trust for that purpose, and the bridge is in a condition of maintenance satisfactory to the Department of Highways of the state of Louisiana, or its successor, said department, or its successor, may at its sole option assume jurisdiction and control of the bridge, which will then become part of the state highway system of Louisiana and be subject to maintenance, control and operation, as an integral part of the state highway system. Thereafter, the collection of tolls, if any, shall be governed by the provisions of R.S. 48:886. Nothing herein contained, however, shall be construed as making the aforesaid assumption of jurisdiction and control mandatory.
La. Roads, Bridges and Ferries § 48:893