The board of supervisors of any county in the State of Mississippi bordering on the Mississippi Sound or Gulf of Mexico, having an assessed valuation of less than five million ($5,000,000.00) dollars according to the last completed assessment, and maintaining a seawall or road protection structure under this chapter, is hereby authorized, in its discretion, and subject to complying with the provisions of Sections 65-33-17 through 65-33-21, to borrow funds not to exceed two hundred thousand ($200,000.00) dollars at a rate of interest not exceeding six (6%) per cent per annum, in addition to such sums as may have heretofore been borrowed, for the purpose of constructing, repairing and maintaining such seawall or road protection structure and/or the public roads of such county, and in its discretion, to expend such funds or any part thereof in conjunction with contributions and allotments of funds, materials or labor for the works progress administration or other governmental department for the aforesaid improvements, or any of them.