43 C.F.R. § 2933.23 When must I pay the fees?
Title 43 - Public Lands: Interior
You must pay the required fees upon occupying a designated recreation use facility, when you receive services, or as the BLM's reservation system may require. These practices vary from site to site. You may contact the local BLM office with jurisdiction over the area or site for fee information.
Title 43: Public Lands: Interior
PART 2930—PERMITS FOR RECREATION ON PUBLIC LANDS
Subpart 2933—Recreation Use Permits for Fee Areas
§ 2933.23 When must I pay the fees?