This dedication is made with the exceptions and reservations, however, of all rights and privileges which have heretofore been granted by this Commonwealth, in, to, upon, and about said lands and waters, to the United States Government, the Commission of the Water Works of the city of Erie, and the Department of Fisheries of Pennsylvania, and the further exception and reservation that the second described tract, including water lots fronting on the third section of the city of Erie, shall not be put to commercial or industrial uses.