A bill to establish the Potomac National River in the States of Maryland, Virginia, and West Virginia, and in the District of Columbia.

Establishes the Potomac National River in Maryland, Viginia, West Virginia, and the District of Columbia.

Authorizes the Secretary of the Interior to acquire specified lands and interests in lands within the boundaries of such national river. Directs the Secretary to encourage and assist the jurisdictions in which the national river is located to plan, acquire, develop, and manage lands within and adjacent to the national river for recreation, fish and wildlife conservation, historic preservation, or similar purposes. Authorizes the Secretary to make supplemental grants to such jurisdictions for acquisition of lands and interests in lands within 2,000 feet of the banks of the Potomac River.

Permits hunting on lands within the national river which are under the jurisdiction of the Secretary.

Authorizes the Secretary to enter into agreements with non-Federal public bodies for the operation and management by the Secretary or such public bodies of lands within the national river in accordance with a mutually acceptable management plan.

Directs the Secretary to formulate and transmit to appropriate Congressional committees within three years from the date of the enactment of this Act a plan for the development and use of lands within the national river.

Includes the Chesapeake and Ohio Canal National Historical Park and the Harpers Ferry National Historical Park as identifiable units of the national river and stipulates that such historical parks shall continue to be administered separately in accordance with their respective enabling acts.

Establishes a Potomac National River Advisory Commission to advise and consult with other Federal agencies, State agencies, local governments, and persons on matters relating to recreation, historic preservation, scenic protection, and resource conservation within and in the vicinity of the national river.

Directs the Secretary to report to Congress within two years after the date of enactment of this Act recommendations as to extension of the national river from the area established by this Act to the Potomac River's source at Fairfax Stone, West Virginia, and to its mouth at the Chesapeake Bay.

Authorizes the appropriation of such sums as may be necessary to effectuate the purposes of this Act.