Before or at the time of closing all or portions of Reclamation facilities, lands, or waterbodies to public use, the responsible authorized official must indicate the closure by:
(a) Locked doors, fencing, gates, or other barriers;
(b) Posted signs and notices at conspicuous locations, such as at normal points of entry and at reasonable intervals along the boundary of the closed area; or
(c) Other reasonably obvious means including, but not limited to, onsite personal contact with a uniformed official.