When an area is subdivided and a plat of the subdivision is approved, filed, and recorded, all streets, alleys, thoroughfares, parks and other public areas shown on the plat are considered to be dedicated to public use.
Alaska Legal Code
When an area is subdivided and a plat of the subdivision is approved, filed, and recorded, all streets, alleys, thoroughfares, parks and other public areas shown on the plat are considered to be dedicated to public use.