(1) The system shall be composed of trails as designated by the board. Such trails shall meet the conditions established in this chapter and such supplementary criteria as the board may prescribe.
(2) The board shall establish a procedure whereby federal, state, and local governmental agencies and/or public and private organizations may propose trails for inclusion within the system. Such proposals will comply with the proposal requirements contained in RCW 79A.35.050.
(3) In consultation with appropriate federal, state, and local governmental agencies and public and private organizations, the board shall establish a procedure for public review of the proposals considered appropriate for inclusion in the statewide trails system.