Roads

(a) Setbacks (1) Measurement in general A setback under this section shall be measured from the center line of the road. (2) Wilderness on 1 side of roads Except as provided in subsection (b), a setback for a road with wilderness on only 1 side shall be set at— (A) 300 feet from a paved Federal or State highway; (B) 100 feet from any other paved road or high standard dirt or gravel road; and (C) 30 feet from any other road. (3) Wilderness on both sides of roads Except as provided in subsection (b), a setback for a road with wilderness on both sides (including cherry-stems or roads separating 2 wilderness units) shall be set at— (A) 200 feet from a paved Federal or State highway; (B) 40 feet from any other paved road or high standard dirt or gravel road; and (C) 10 feet from any other roads. (b) Setback exceptions (1) Well-defined topographical barriers If, between the road and the boundary of a setback area described in paragraph (2) or (3) of subsection (a), there is a well-defined cliff edge, stream bank, or other topographical barrier, the Secretary shall use the barrier as the wilderness boundary. (2) Fences If, between the road and the boundary of a setback area specified in paragraph (2) or (3) of subsection (a), there is a fence running parallel to a road, the Secretary shall use the fence as the wilderness boundary if, in the opinion of the Secretary, doing so would result in a more manageable boundary. (3) Deviations from setback areas (A) Exclusion of disturbances from wilderness boundaries In cases where there is an existing livestock development, dispersed camping area, borrow pit, or similar disturbance within 100 feet of a road that forms part of a wilderness boundary, the Secretary may delineate the boundary so as to exclude the disturbance from the wilderness area. (B) Limitation on exclusion of disturbances The Secretary shall make a boundary adjustment under subparagraph (A) only if the Secretary determines that doing so is consistent with wilderness management goals. (C) Deviations restricted to minimum necessary Any deviation under this paragraph from the setbacks required under in paragraph (2) or (3) of subsection (a) shall be the minimum necessary to exclude the disturbance. (c) Delineation within setback area The Secretary may delineate a wilderness boundary at a location within a setback under paragraph (2) or (3) of subsection (a) if, as determined by the Secretary, the delineation would enhance wilderness management goals.