La. Stat. tit. 33 § 1238
The police jury desiring to take such action shall give public notice thereof in the official journal of the parish for a period of at least thirty days. The notice shall give the date, hour, and place of a meeting to be held for the purpose of authorizing the closing of the canal or stream. The notice shall likewise designate and name the canal or stream they propose to close or dam. The police jury shall then hold a public hearing at the date, hour, and place designated in the notice, and allow all interested parties to be heard for or against the proposition. After the hearing, if the facts and findings warrant the police jury to take such action in closing or damming the stream as advertised, it shall then have the authority and power to do so.
La. R.S. § 33:1238