The commissioner shall, within one year after a river has been included in the state wild, scenic and recreational rivers system, establish detailed boundaries of the river area associated with that river, except that in the case of river areas within the Adirondack park said boundaries shall be mutually agreed upon by the commissioner and the agency. Said boundaries shall not exceed a width of one-half mile from each bank thereof.
N.Y. Envtl. Conserv. Law § 15-2711