Cal. Pub. Res. Code § 5074.1

The director shall be responsible for planning and for the orderly development and operation of the system. The director shall encourage other public agencies to acquire, develop, and manage segments of the system which are outside of the exterior boundaries of state park system units, and other areas under state jurisdiction. The director may enter into contractual agreements under which responsibility for state trail development and operation may be carried out by other public agencies.