La. Stat. tit. 33 § 3683
Upon receipt of a petition requesting the improvement the parish governing body shall prepare plans and specifications of the work to be placed on file in the secretary's or parish engineer's office, and shall adopt an ordinance ordering and describing in general terms the contemplated improvement, and authorizing the secretary of the police jury to advertise for bids. The advertisement shall be inserted at least weekly for three weeks in the official journal of the parish, the first insertion to be not less than fifteen days prior to the date fixed for the reception of the bids. The advertisement shall contain a general description of the contemplated improvement, shall refer to the plans and specifications on file, and shall designate the hour, date, and place for the reception and opening of the bids. The police jury shall let the contract to the lowest responsible bidder who can furnish satisfactory security, but shall have the right to reject any and all bids.
La. R.S. § 33:3683