The granting and issuance of any permit, or any renewal thereof, for access to and on the reservoir and its area, shall not constitute an exclusive right or privilege, but the same shall be subservient and subject to the rights and powers of the district and the board, their officers, representatives, agents and employees, to do and perform any act or acts in the operation, maintenance and regulation of said reservoir, and in the inspection, regulation and control of the access areas and the granting of other permits; the district and the board, their officers, agents and employees to have, at all times, absolute right of entry upon and over the access area for the purposes aforesaid; access areas shall be subject to right-of-way of other authorized permittees for necessary ingress and egress to other access areas by foot-pass.