The County Engineer is hereby directed to classify all County roads for which public expenditures were made in the acquisition, improvement, or maintenance of the same, according to the type and amount of expenditures made and the nature of Clallam County’s property interest in the road; and is further directed to separately classify County roads for which public expenditures have not been made in the acquisition, improvement or maintenance of the same, according to the nature of Clallam County’s property interest in the road.