Cal. Pub. Resources Code § 5541.1
The East Bay Regional Park District may plan, adopt, lay out, plant, develop, and otherwise improve, extend, control, operate, and maintain vehicular recreational areas and trails for the use and enjoyment of all the inhabitants of the district, and it may select, designate, and acquire land, or rights in land, within or without the district, to be used and appropriated for such purposes. The East Bay Regional Park District may cause such vehicular recreational areas and trails to be opened, altered, widened, extended, graded or regraded, paved or repaved, planted or replanted, repaired, and otherwise improved.
The Board of Directors of the East Bay Regional Park District shall not interfere with the control of any vehicular recreational area or trail that is existing, owned, or controlled by a municipality or county in the district, except with the consent of the governing body of the municipality, or of the county if the same is in unincorporated territory, and upon such terms as may be mutually agreed upon between the board of directors of the district and the governing body.
Ca. Pub. Res. Code § 5541.1