Shannon Navigation Act, 1839

No Weirs or other Obstructions shall be placed in the Navigation without the Consent of the Commissioners.

XXXVIII. And be it enacted, That it shall not be lawful for any Person whomsoever, from and after the passing of this Act, to make or erect, alter, raise or enlarge, any Weir, Dam, Watercourse, or other Matter or Thing in the said River Shannon, or in any of the Rivers aforesaid, within the Limits which shall be defined as herein-after directed, or to divert the Waters of any of the said Rivers, or to introduce into the same respectively any other Waters or Drainage which in the Opinion of the said Commissioners may prove injurious to the Navigation thereof, or to the Drainage to be effected under this Act, or to fish upon or from any of the Weirs or any Dams or other Work or Works which shall be erected by the said Commissioners, without the Consent of the said Commissioners, which Consent shall be signified by Warrant under the Hands and Seals of Two or more of them, and which Consent shall continue in force for Three Years, and not for any longer Period; and every Person who shall offend against any of the Provisions aforesaid, being convicted thereof before any Justice or Justices of the Peace where such Offence shall be committed, by the Oath of One or more credible Witness or Witnesses, shall for each such Offence be fined by such Justice or Justices a Sum not exceeding Ten Pounds, to be levied in such Manner as is herein-after directed with respect to Fines to be imposed by any Justice or Justices.