As soon as practicable, the commissioner shall place on the mainland at some convenient point at or near the water’s edge at Fishers Landing, Jefferson county, New York, and not more than one mile westerly thereof, a signboard facing the water and bearing thereon in large characters the words “St. Lawrence river boat regulation zone, west limit.” He shall in like manner place a similar signboard at some convenient place at or near the water’s edge and facing the water on the mainland easterly of Alexandria Bay and within one mile easterly thereof and southeasterly of the United States government lighthouse in the waters of said river, known as Sunken Rock Light, except that the words “east limit” shall appear in the place of “west limit”. If necessary, he may acquire for the state, by agreement with the owners of the lands affected, easements for such purposes. That portion of the waters of the Saint Lawrence river northerly of the mainland of Jefferson county and southerly of the international boundary line between the United States and Canada and easterly of a line drawn northwesterly from the marker hereinbefore referred to at Fishers Landing and westerly of a line drawn from the marker hereinbefore referred to easterly of Alexandria Bay, and running in a northwesterly direction through the said Sunken Rock Light, shall constitute a motor boat regulation zone for the purpose of this article. The expense attached to the performance of the foregoing duties shall be payable from moneys that may be available therefor by appropriation and from moneys, if any, contributed by persons interested. Such zone shall be deemed established and the rules prescribed by this article shall be applicable when such poles or markers and signs shall be installed, and not before.