; 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); and (iii) the effective date of a determination of the Secretary not to authorize livestock grazing or other use by livestock under subsection (c)(1). (2) Administration Subject to valid existing rights, the Secretary shall manage the Williams Fork Mountains Wilderness in accordance with the Colorado Wilderness Act of 1993 ( 16 U.S.C. 1132 note; Public Law 103–77 ), except that any reference in that Act to the effective date of that Act shall be considered to be a reference to the date on which the Williams Fork Mountains Wilderness is designated in accordance with paragraph (1). 104. Porcupine Gulch Wildlife Conservation Area (a) Designation Subject to valid existing rights, the approximately 8,287 acres of Federal land located in the White River National Forest, as generally depicted as Proposed Porcupine Gulch Wildlife Conservation Area on the map entitled Porcupine Gulch Wildlife Conservation Area Proposal and dated June 24, 2019, are designated as the Porcupine Gulch Wildlife Conservation Area (referred to in this section as the Wildlife Conservation Area ). (b) Purposes The purposes of the Wildlife Conservation Area are— (1) to conserve and protect a wildlife migration corridor over Interstate 70; and (2) to conserve, protect, and enhance for the benefit and enjoyment of present and future generations the wildlife, scenic, roadless, watershed, and ecological resources of the Wildlife Conservation Area. (c) Management (1) In general The Secretary shall manage the Wildlife Conservation Area— (A) in a manner that conserves, protects, and enhances the purposes described in subsection (b); and (B) in accordance with— (i) the Forest and Rangeland Renewable Resources Planning Act of 1974 ( 16 U.S.C. 1600 et seq. )