16 U.S. Code § 6206 - Cabin user fees
The base cabin user fee for a lot on which a caretaker cabin is located shall not be greater than the base cabin user fee charged for the authorized use of a similar typical lot in the tract.
If a review of a decision to convert a lot to an alternative public use indicates that the continuation of the authorization for use and occupancy of the cabin by the cabin owner is warranted, and the decision is subsequently reversed, the Secretary may require the cabin owner to pay any portion of annual cabin user fees that were forgone as a result of the expectation of termination of use and occupancy of the cabin by the cabin owner.
On a determination by the agency that, because of an act of God or a catastrophic event, a lot cannot be safely occupied and the authorization for the lot should accordingly be terminated, the fee obligation of the cabin owner shall terminate effective on the date of the occurrence of the act or event.
Pub. L. 113–291, div. B, title XXX, § 3024(k), Dec. 19, 2014, 128 Stat. 3766, provided that, effective on the date of the assessment of annual permit fees in accordance with section 6214(f) of this title (as certified to Congress by the Secretary of Agriculture), this section is repealed.