3. Studies of the Cacapon, Shenandoah, and South Branch Potomac Rivers to determine the most feasible way to preserve all or portions of these scenic and important tributaries in a relatively unspoiled state. Possibilities here are protection under State legislation, or the establishment of a new Federal category of pastoral or scenic rivers as a protective measure for streams in settled regions such as would be authorized under legislation pending in the Congress. 4. Encouragement of local action to preserve the banks of smaller free-flowing streams by zoning, park acquisition, or other means. 5. Provision, under auspices of State fish and wildlife agencies or otherwise, or better facilities for public access to all main streams--including, where appropriate, roads, trails, parking areas, boat launching ramps, and public transportation. C. The historic Potomac estuary, with nearly a quarter of a million acres of water surface and hundreds of miles of varied and scenic shoreline, is a rich recreational and wildlife asset as well as a fisheries resource of enormous value. Even after water quality programs rescue its upper reaches from the heavy pollution to which they are presently subject, however, more knowledge will be needed than presently exists to make certain that its intricate processes continue to function productively; protection of its shores against growing inappropriate encroachment will be an urgent problem; and the possibility of its use by the public for recreation will need to be assured: 1. A cooperative study should be undertaken by Federal agencies, the States of Maryland and Virginia, the District of Columbia, and the Metropolitan Washington Council of Governments, coordinated through the Bureau of Outdoor Recreation, to identify recreational and other open space and specific resources along the tidal Potomac downstream from Chain Bridge that should be established as estuarine units of a Potomac National River, as State or county parks, or as units of a system of recreation areas for the District of Columbia and its metropolitan environs. The Department of the Interior is assisting the Department of Defense to determine how military establishments along the Potomac might contribute toward meeting regional recreational needs, including public access and use where feasible. These studies should be completed and the findings reported to the Congress and to State and local governments at the earliest possible time.