50 CFR §29.22

1. (a)Change in jurisdiction over and disposal of lands. The final disposal by the United States of any tract of land traversed by a right-of-way shall not be construed to be a revocation of the right-of-way in whole or in part, but such final disposition shall be deemed and taken to be subject to such right-of-way unless it has been specifically canceled.
2. (b)Transfer of permit. Any proposed transfer, by assignment, lease, operating agreement or otherwise, of a permit must be filed with the Regional Director and must be supported by a stipulation that the transferee agrees to comply with and be bound by the terms and conditions of the original permit. A $100 nonrefundable service fee must accompany the proposal. No transfer will occur unless and until approved in writing by the Regional Director.
3. (c)Disposal of property on termination of right-of-way. In the absence of any agreement to the contrary:
   1. (1)The holder of the right-of-way must, within 6 months after termination of the right-of-way, remove all property or improvements placed there by the holder, other than a road and usable improvements to a road.
   2. (2)After 6 months, all property and improvements in the right-of-way area become the property of the United States.
   3. (3)The Regional Director may use discretion to extend this timeframe.