Our Laws and Policies page highlights more of our park management plans as well as federal regulations across the National Park Service. On October 8, 1964, President Lyndon Johnson signed the act that formally established the "Lake Mead National Recreation Area." This act redesignated the old Boulder Dam Recreation Area, whose boundaries had been substantially enlarged in 1947 to include the yet-to-be-filled Lake Mohave, in recognition of its equally significant recreational opportunities. The area as established in 1964 included some 3,000 square miles of lake and desert out to the western boundary of Grand Canyon National Monument. In actuality, then, the recreation area encompassed over 90 miles of the westernmost Grand Canyon. It also included the highland area north of the Grand Canyon known as the "Shivwits Plateau." In 1974 the boundaries of the recreation area were again modified. Grand Canyon National Park was expanded to include all of Grand Canyon National Monument and the Lake Mead portion of the Grand Canyon. Thus, the entire Grand Canyon came to be under one administrative unit. |
Last updated: January 10, 2026