The agencies are to cooperate

Title 16 United States Code
Coordination of Outdoor Recreation Programs

16 USC Section 460l. Congressional findings and declaration of policy

The Congress finds and declares it to be desirable that all
American people of present and future generations be assured
adequate outdoor recreation resources, and that it is desirable for
all levels of government and private interests to take prompt and
coordinated action to the extent practicable without diminishing or
affecting their respective powers and functions to conserve,
develop, and utilize such resources for the benefit and enjoyment
of the American people.