Major John Wesley Powell leads first recored expedition to traverse Grand Canyon.
Bureau of Reclamation
Reclamation Act Creates the Bureau of Reclamation.
National Park Service Organic Act
National Park Service Organic Act passed.
Grand Canyon National Park
Grand Canyon National Park created.
Colorado River was officially re-named from the “Grand” to the “Colorado.”
Colorado River Compact
Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.
Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually.
Upper Colorado River Basin Compact
Upper Colorado River Basin Compact signed.
Colorado River Storage Project Act
Colorado River Storage Project Act passed authorizing Glen Canyon Dam.
Arizona vs California
U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water.
Glen Canyon Dam Completed
Glen Canyon Dam completed as part of the Colorado River Storage Project.
Arizona v. California Decree
U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada’s allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.
Colorado River Storage Project
United States contract for delivery of power from the Colorado River Storage Project to customers.
National Historic Preservation Act of 1966
National Historic Preservation Act of 1966 passed.
Humpback chub and Colorado pikeminnow
Humpback chub and Colorado pikeminnow federally listed as endangered.
Colorado River Basin Project Act of 1968
Colorado River Basin Project Act of 1968 passed.
National Environmental Policy Act (NEPA) of 1969
National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.