; and (B) the Blue Ridge Allotment. (2) Modification of allotments In publishing a determination pursuant to paragraph (1), the Secretary may modify or combine the vacant allotments referred to in that paragraph. (3) Permit or other authorization Not later than 1 year after the date on which a determination of the Secretary to authorize livestock grazing or other use by livestock is published under paragraph (1), if applicable, the Secretary shall grant a permit or other authorization for such livestock grazing or other use. (d) Range improvements (1) In general If the Secretary permits livestock grazing or other use by livestock on the potential wilderness area under subsection (c), the Secretary, or a third party authorized by the Secretary, may use any motorized or mechanized transport or equipment for purposes of constructing or rehabilitating such range improvements as are necessary to obtain appropriate livestock management objectives (including habitat and watershed restoration). (2) Termination of authority The authority provided by this subsection terminates on the date that is 2 years after the date on which the Secretary publishes a positive determination under subsection (c)(3). (e) Designation as wilderness (1) Designation The potential wilderness area designated by subsection (a) shall be designated as wilderness, to be known as the Williams Fork Wilderness — (A) effective not earlier than the date that is 180 days after the date of enactment of this Act; and (B) on the earliest of— (i) the date on which the Secretary publishes in the Federal Register a notice that the construction or rehabilitation of range improvements under subsection (d) is complete; (ii) the date described in subsection (d)(2)