The purpose of AS 41.21.470 - 41.21.490 is to restrict all vacant and unappropriated state-owned land, water, and stream crossings within the boundaries described in AS 41.21.475 to use as a public recreation area. Under the provisions of AS 38.05.300 , state land, water, or land and water containing more than 640 acres may be closed to multiple purpose use only by act of the legislature. Inasmuch as the area described in AS 41.21.475 exceeds 640 acres, AS 41.21.470 - 41.21.490 are intended to except the area described from the provisions of AS 38.05.300.