36 C.F.R. § 218.21 – Emergency situations.

(a) Authority. The Chief and the Associate Chief of the Forest Service are authorized to make the determination that an emergency situation exists as defined in this section.
(b) Emergency situation definition. A situation on National Forest System (NFS) lands for which immediate implementation of a decision is necessary to achieve one or more of the following: Relief from hazards threatening human health and safety; mitigation of threats to natural resources on NFS or adjacent lands; avoiding a loss of commodity value sufficient to jeopardize the agency's ability to accomplish project objectives directly related to resource protection or restoration.
(c) Determination. The determination that an emergency situation exists shall be based on an examination of the relevant information. During the consideration by the Chief or Associate Chief, additional information may be requested from the responsible official. The determination that an emergency situation does or does not exist is not subject to administrative review under this part.
(d) Implementation. When it is determined that an emergency situation exists with respect to all or part of the proposed project or activity, the proposed action shall not be subject to the predecisional objection process and implementation may proceed as follows:
1. (1) Immediately after notification (see 36 CFR 220.7(d)) when the decision is documented in a Decision Notice (DN).
2. (2) Immediately after complying with the timeframes and publication requirements described in 40 CFR 1506.10(b)(2) when the decision is documented in a Record of Decision (ROD).
(e) Notification. The responsible official shall identify any emergency situation determination made for a project or activity in the notification of the decision (see 36 CFR 220.5(g) and 220.7(d)).