36 C.F.R. § 71.2

There shall be three types of Federal recreation fees:

(a) Entrance fees, charged either on an annual or single-visit basis, for admission to any Designated Entrance Fee Area;

(b) Daily recreation use fees for the use of specialized sites, facilities, equipment or services furnished at Federal expense; and

(c) Special recreation permit fees for specialized recreation uses, such as, but not limited to, group activities, recreation events, and the use of motorized recreation vehicles.