54 USC 101912 – Findings and declaration of policy
(a)
(1) visitation will not unduly impair those resources and values; and
(2) development of public accommodations, facilities, and services within System units can best be limited to locations that are consistent to the highest practicable degree with the preservation and conservation of the resources and values of the System units.
(b)
(1) are necessary and appropriate for public use and enjoyment of the System unit in which they are located; and
(2) are consistent to the highest practicable degree with the preservation and conservation of the resources and values of the System unit.