25 CFR 170.813 - When can access to IRR transportation facilities be restricted?
IRR transportation facilities must be open and available for public use, as are IRRs (§ 170.120).
(1) Because of unsafe conditions;
(2) Because of natural disasters;
(3) For fish or game protection;
(4) To prevent traffic from causing damage to the facility; and
(5) For reasons deemed to be in the public interest such as fire prevention or suppression as approved by the Secretary.
(b) Consultation is not required whenever the above conditions involve immediate safety or life-threatening situations.
(c) Certain IRR transportation facilities owned by the tribes or BIA may be permanently closed when the tribal government and the Secretary agree. Once this agreement is reached, BIA must remove the facility from the IRR System.