43 U.S.C. § 315c
Fences, wells, reservoirs, and other improvements necessary to the care and management of the permitted livestock may be constructed on the public lands within such grazing districts under permit issued by the authority of the Secretary, or under such cooperative arrangement as the Secretary may approve. Permittees shall be required by the Secretary of the Interior to comply with the provisions of law of the State within which the grazing district is located with respect to the cost and maintenance of partition fences. No permit shall be issued which shall entitle the permittee to the use of such improvements constructed and owned by a prior occupant until the applicant has paid to such prior occupant the reasonable value of such improvements to be determined under rules and regulations of the Secretary of the Interior. The decision of the Secretary in such cases is to be final and conclusive.
43 U.S.C. § 315c