In order to facilitate the United States in the acquisition of flowage rights and rights-of-way for levee foundations, the Secretary of the Army is authorized to enter into agreements with the States or with local levee districts, boards, commissions, or other agencies for the acquisition and transfer to the United States of such flowage rights and levee rights-of-way, and for the reimbursement of such States or local levee districts, boards, commissions, or other agencies, for the cost thereof at prices previously agreed upon between the Secretary of the Army and the governing authority of such agencies, within the maximum limitations hereinafter prescribed: Provided, That no money appropriated under the authority of sections 702g–1 and 702k–1 of this title shall be expended upon the construction of the Eudora Floodway, the Morganza Floodway, the back protection levee extending north from the Eudora Floodway, or the levees extending from the head of the Morganza Floodway to the head of and down the east bank of the Atchafalaya River to the intersection of said Morganza Floodway until 75 per centum of the value of the flowage rights and rights-of-way for levee foundations, as estimated by the Chief of Engineers, shall have been acquired or options or assurances satisfactory to the Chief of Engineers shall have been obtained for the Eudora Floodway, the Morganza Floodway, and the area lying between said back protection levee and the present front line levees: Provided further, That easements required in said areas in connection with roads and other public utilities owned by States or political subdivisions thereof shall be provided without cost to the United States upon the condition, that the United States shall provide suitable crossings, including surfacing of like character, over floodway guide-line levees in said areas for all improved roads now constituting a part of the State highway system, and shall repair all damage done to said highways within the said floodways by the actual use of such floodways for diver