National Wild and Scenic Rivers System

The National Wild and Scenic River is a designation for certain protected areas in the United States.

The National Wild and Scenic Rivers Act was an outgrowth of the recommendations of a Presidential commission, the Outdoor Recreation Resources Review Commission (ORRRC). Among other things, the commission recommended that the nation protect wild rivers and scenic rivers from development that would substantially change their wild or scenic nature. The act was sponsored by Sen. Frank Church (D-Idaho) and signed into law by President Lyndon B. Johnson on October 2, 1968. A river or river section may be designated by the U.S. Congress or the Secretary of the Interior. In 1968, as part of the original act, eight rivers were designated as National Wild and Scenic Rivers (Clearwater, Eleven Point, Feather, Rio Grande, Rogue, St. Croix, Salmon, and Wolf). As of July 2011^[update], 203 rivers, totaling 12,598 miles of river in 38 states and Puerto Rico, have wild and scenic status. By comparison, more than 75,000 large dams across the country have modified at least 600,000 miles, or about 17%, of American rivers.

...
Wikipedia