43 CFR § 6302.19
When may BLM close or restrict use of wilderness areas?
June 11, 2020
When necessary to carry out the provisions of the Wilderness Act and other Federal laws, BLM may close or restrict the use of lands or waters within the boundaries of a BLM wilderness area, using the procedures in §8364.1 of this chapter. BLM will limit any such closure to affect the smallest area necessary for the shortest time necessary.