16 U.S.C. § 6807: Expenditures

shall be accounted for separately from the amounts collected; may be distributed agency-wide; and repair, maintenance, and facility enhancement related directly to visitor enjoyment, visitor access, and health and safety; interpretation, visitor information, visitor service, visitor needs assessments, and signs; habitat restoration directly related to wildlife-dependent recreation that is limited to hunting, fishing, wildlife observation, or photography; law enforcement related to public use and recreation; direct operating or capital costs associated with the recreation fee program; a fee management agreement established under section 6805(a) of this title or a visitor reservation service; the processing of special recreation permit applications and administration of special recreation permits; and the improvement of the operation of the special recreation permit program under section 6802(h) of this title . The Secretary may not use any recreation fees for biological monitoring on Federal recreational lands and waters under the Endangered Species Act of 1973 [ 16 U.S.C. 1531 et seq.] for listed or candidate species. The Secretary may use not more than an average of 15 percent of total revenues collected under this chapter for administration, overhead, and indirect costs related to the recreation fee program by that Secretary. the National Parks and Federal Recreational Lands Pass during the 5-year period beginning on the date the joint guidelines are issued under section 6804(a)(7) of this title ; and a regional multientity pass authorized section 6804(d) of this title during the 5-year period beginning on the date the regional multientity pass agreement for that recreation pass takes effect.