[123], The changes in water flow and use caused by Hoover Dam's construction and operation have had a large impact on the Colorado River Delta. At the same time, populations continue to grow in the sun-drenched region. Overall, there is enough concrete in the dam to pave a two-lane highway from San Francisco to New York. [133] The official status this conferred to the name "Hoover Dam" had been noted on the floor of the House of Representatives by Congressman Edward T. Taylor of Colorado on December 12, 1930,[134] but was likewise ignored by Ickes. In reality, the distance to most of the stars is more than Share sensitive information only on official, secure websites. [17], With little guidance on water allocation from the Supreme Court, proponents of the dam feared endless litigation. [98] Following an uprating project from 1986 to 1993, the total gross power rating for the plant, including two 2.4 megawatt Pelton turbine-generators that power Hoover Dam's own operations is a maximum capacity of 2080 megawatts. According to data from the U.S. Bureau of Reclamation, the water elevation of Hoover Dam was almost 1,200 . These rivers drain 242,000 square miles in the United States, or one-twelfth of the country's continental land area, and 2,000 square miles in Mexico. Image of the Day This was roughly 44 feet lower than the monthly elevation in July 2020, and the lowest monthly water level recorded since Lake Mead was first formed by the Hoover Dam in the 1930s. Description and meaning. [93] The powerhouse was one of the projects uncompleted at the time of the formal dedication on September 30, 1935; a crew of 500men remained to finish it and other structures. Quail Lakes & Coal: Energy for Wildlife and the World, 2013, page 60, Bureau of Reclamation: Lower Colorado Region- Hoover Dam, U.S. National Register of Historic Places, Article I of the United States Constitution, Chinese benevolent association in the city, Los Angeles Department of Water and Power, Metropolitan Water District of Southern California, Mike O'CallaghanPat Tillman Memorial Bridge, National Historic Civil Engineering Landmark, List of dams in the Colorado River system, List of largest hydroelectric power stations, List of largest hydroelectric power stations in the United States, List of National Historic Landmarks in Arizona, List of National Historic Landmarks in Nevada, National Register of Historic Places portal, "What you need to know about Lake Mead's falling water levels", "Nevada and Arizona: Hoover Dam (U.S. National Park Service)", "Sharing Colorado River Water: History, Public Policy and the Colorado River Compact", "Impacts of the 1928 St. Francis Dam Failure on Geology, Civil Engineering, and America", "Lower Colorado Bureau of Reclamation: Hoover Dam, Facts and Figures", "Hoover Dam: Grout Curtain Failure and Lessons Learned in Site Characterization", American Heritage's Invention & Technology, "Catching a Wave - Jet Flow Gate Testing Brings a Crowd", "OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS", "Receding Lake Mead poses challenges to Hoover Dam's power output", "Lake Mead Drops to its Lowest-Ever Level", "Drought Diminishes Hydropower Capacity in Western U.S.", "Lake Mead: Largest US reservoir dips to record low", "Hoover Dam, symbol of the modern West, faces a new test with an epic water shortage", "Los Angeles considers $3B pumped storage project at Hoover Dam", "City Of Los Angeles Wants To Turn Hoover Dam Into World's Largest Pumped Energy Storage Facility", "President signs Hoover Dam Power Allocation Act", "House, after stiff debate, backs cheap power for 3 Western states", "Crossing Hoover Dam: A Guide for Motorists", "The Hoover Dam Everything You Need to Know About Visiting", "Upper Colorado River Endangered Fish Recovery Program", "Resurrecting the Dammed: A Look at Colorado River Restoration", 10.1641/0006-3568(2001)051[0998:RTDALA]2.0.CO;2, "A Conservation Plan for Native Fishes of the Lower Colorado River", 10.1641/0006-3568(2003)053[0219:ACPFNF]2.0.CO;2, "Macrofaunal and isotopic estimates of the former extent of the Colorado River estuary, upper Gulf of California, Mxico", "Science and Values in River Restoration in the Grand Canyon", Historic Construction Company Project Hoover Dam, Boulder City/Hoover Dam Museum official site, Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV, Hoover Dam, Southern California Edison 138-kV Switchyard, Hoover Dam, Metropolitan Water District Switchyard, Hoover Dam, Southern California Edison 230-kV Switchyard, Hoover Dam, Los Angeles Relay Control Building, Hoover Dam, Los Angeles Bureau of Power and Light Lines 13, Hoover Dam, Southern California Edison North and South Lines, Hoover Dam, HooverBasic Magnesium North and South Lines, Hoover Dam, Metropolitan Water District Line 1, Hoover Dam, U.S. Highway 93 Nevada Segment, Hoover Dam, U.S. Highway 93 Arizona Segment, Hoover Dam, Nevada Downstream Waste Tailings, Hoover Dam, HendersonMead Transmission Line 2, Arizona Gravel Pit Road, 6 to 8 miles northeast of Boulder City, Clark County, NV, Hoover Dam Aggregate Classification Plant, 6.5 miles northeast of Boulder City, Clark County, NV, Six Companies Railroad, 6 to 8 miles northeast of Boulder City, Clark County, NV, Boulder DamSan Bernardino (115kV) Transmission Line, Eldorado to Ivanpah Section, Primm, Clark County, NV, Brownstone Canyon Archaeological District, Gold Strike Canyon-Sugarloaf Mountain Traditional Cultural Property, Grapevine Canyon Petroglyphs (AZ:F:14:98 ASM), Las Vegas High School Academic Building, Gymnasium, and Frazier Hall, Las Vegas High School Neighborhood Historic District, Old Spanish Trail/Mormon Road Historic District, Sheep Mountain Range Archeological District, National Register of Historic Places listings in Nevada, Presidential transition of Franklin D. Roosevelt, Birthplace and childhood home National Historic Site, Presidential Library, Museum, and gravesite, International Boundary and Water Commission, https://en.wikipedia.org/w/index.php?title=Hoover_Dam&oldid=1141134164, Buildings and monuments honoring American presidents in the United States, Buildings and structures in Clark County, Nevada, Buildings and structures in Mohave County, Arizona, Dams on the National Register of Historic Places in Nevada, Energy infrastructure on the National Register of Historic Places, Historic American Engineering Record in Arizona, Historic American Engineering Record in Nevada, Industrial buildings and structures on the National Register of Historic Places in Arizona, National Register of Historic Places in Mohave County, Arizona, Tourist attractions in Clark County, Nevada, Tourist attractions in Mohave County, Arizona, Articles with dead external links from July 2022, Wikipedia indefinitely move-protected pages, Wikipedia pending changes protected pages, Short description is different from Wikidata, All Wikipedia articles written in American English, Creative Commons Attribution-ShareAlike License 3.0, Power, flood control, water storage, regulation, recreation, Wellton-Mohawk Irrigation and Drainage District, Sulphur Springs Valley Electric Cooperative, This page was last edited on 23 February 2023, at 14:45. How was the powerplant machinery transported from the canyon rim to the powerplant? [42] Sixteen workers and other riverbank residents died of heat prostration between June 25 and July 26, 1931. The government was to provide the materials, and the contractor was to prepare the site and build the dam. [58] One high scaler was able to save a life in a more direct manner: when a government inspector lost his grip on a safety line and began tumbling down a slope towards almost certain death, a high scaler was able to intercept him and pull him into the air. How much sediment will be deposited in the reservoir? The excavation of this U-shaped structure located at the downstream toe of the dam was completed in late 1933 with the first concrete placed in November 1933. Colorado River Drought Contingency Planning. What is the capacity of the Hoover Powerplant? In 1922, representatives of seven states met with then-Secretary of Commerce Herbert Hoover. In the chart below, NASA plots out what thats looked like over the past 2022 years. In most years, about 10 percent of the water in the lake comes from local precipitation and groundwater, with the rest coming from snowmelt in the Rocky Mountains that melts and flows down to rivers, traveling through Lake Powell, Glen Canyon, and the Grand Canyon on the way. How are the 30-foot-diameter pipes connected to the powerplant turbines? [101] Under its original design, the dam would no longer be able to generate power once the water level fell below 1,050 feet (320m), which might have occurred in 2017 had water restrictions not been enforced. Hualapai Indian Tribe The river is allotted to states and to Mexico through laws like the 1922 Colorado River Compact and by a recent drought contingency plan announced in 2019. How do the intake towers control water flow? The low water level comes at time when 74 percent of nine Western states face some level of drought; 35 percent of the area is in extreme or exceptional drought. Construction of a rail line joining Las Vegas and the dam site began in September 1930. Land. [72] After the ceremony, Roosevelt made the first visit by any American president to Las Vegas. A plant uprating was completed in 1993, so presently there are fifteen 178,000 horsepower, one 100,000 horsepower, and one 86,000 horsepower Francis-type vertical hydraulic turbines in the Hoover powerplant. How is water discharged from the spillways? Lake Mead National Recreation Area continues to operate water sports, sightseeing, and hiking facilities in the area, despite ongoing drought. The committee drew up a list of demands that evening and presented them to Crowe the following morning. Anza Electric Cooperative, Inc. The river water is allotted to states (including tribal lands) and Mexico through laws like the 1922 Colorado River Compact. Heres a more detailed explanation: The waters force on the blades of the turbine turns a rotor a series of magnets - which is the rotating portion of the generator where a magnetic field is created. The winning bid to build the dam was submitted by a consortium named Six Companies, Inc., which began construction of the dam in early 1931. Image of the Day The phenomenon is often referred to as a bathtub ring.. Each spillway's capacity of 200,000cuft/s (5,700m3/s) was empirically verified in post-construction tests in 1941. [93][96] Original plans called for 16large generators, eight on each side of the river, but two smaller generators were installed instead of one large one on the Arizona side for a total of 17. To read more on what we're all about, learn more about us here. Of Reclamation, the water elevation of Hoover dam was almost 1,200 to provide the,... 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