Lake Mead is America’s first established National Recreation Area. The water level in 2015, however, is part of a decade-long decline, and has reached lows not seen since the 1930s when the lake was first filling. Sie staut den Colorado River zum 640 km² großen Lake Mead. The report predicted Lake Mead will dip just below the threshold to 1,075 feet as early as May 2019 – in nine months. Lake Mead’s Wandering Water Level. The accumulated water from Hoover Dam forced the evacuation of several communities, most notably St. Thomas, Nevada, whose last resident left the town in 1938. Lake Mead is one of the largest bodies of freshwater in the region — but it hasn’t always been there. Elevation (feet above mean sea level) Year Lake Mead Annual High and Low Elevations (1935-2019) High Elevation Low Elevation Dead Storage Storage Capacity Max allowable storage on Aug 1 Note: Low Elevation for 1935 is 673.50 feet. Constructed between 1931 and 1936, during the Great Depression, Hoover Dam was originally built for flood control and to provide hydroelectric power and irrigation water from the Colorado River. At maximum capacity, Lake Mead is 112 miles (180 km) long, 532 feet (162 m) at its greatest depth, has a surface elevation of 1,221.4 feet (372.3 m) above sea level and 247 square miles (640 km2) of surface area, and contains 26.12 million acre feet (3.222×1013 L) of water. On the west are three roads from the Las Vegas metropolitan area. Drought Keeps Lake Mead Levels Low, But There Is Plenty Of Winter Left. November 2020: Sun: Mon: Tue: Wed: Thu: Fri: Sat: 1: 306: 1,081.9: 2: 307: 1,081.8 Lake Mead hit a record high elevation of 1,220 feet above sea level in the summer 1941, just five years after completion of the dam, but the level has fluctuated and been in decline ever since. [5][6] It has been smaller than Lake Powell (the second largest US reservoir when both are full) since 2013. [25] On June 23, 2015, Lake Mead reached another new record low when it briefly fell below 1,075.0 feet (327.7 m), the first official "drought trigger" elevation, for the first time since the lake was filled. It fell to a new record low of 1,071.61 feet (326.63 m) on July 1, 2016 before beginning to rebound slowly. By Ron Dungan. BOULDER CITY (FOX5) -- A gigantic water tank arrived at Lake Mead Thursday as part of the Southern Nevada Water Authority's Low Lake Level Pumping Station. Changing rainfall patterns, climate variability, high levels of evaporation, reduced snow melt runoff, and current water use patterns are putting pressure on water management resources at Lake Mead as the population relying on it for water, and the Hoover Dam for electricity, continues to increase. The … The entire Colorado River Basin has been in a drought for 15 years, causing water levels in the reservoir to plummet. Lake Mead on the Arizona-Nevada border. [49], CS1 maint: multiple names: authors list (, CS1 maint: BOT: original-url status unknown (. Preparing lake level chart... Level Base: MSL Full Pool: 3,700.00 feet: Change Since Yesterday: 0.17 Feet Level Controlled by: Dam Name: Powell (DIVISION OF STATE LANDS & FORESTRY) Daily Levels By Month Colorado River River Levels: Lake Powell Forums: … Preparing lake level chart... Level Base: MSL Full Pool: 1,229.00 feet Winter Pool: 915.00 feet: Change Since Yesterday: 0.07 Feet Level Controlled by: Dam Name: Hoover (DOI BR) Daily Levels By Month Colorado River River Levels: Lake Mead Forums: Lake … Title: Lake Mead Annual High and Low Elevations Author: Reclamation Subject : Lake Mead Annual High and Low Elevations Keywords: Powell, Mead, Mohave, Havasu, … © 2017-2020 Tweet. After 37 years of abundance, some decline was bound to eventually occur. [47], At the bottom of the lake is a Boeing B-29 Superfortress that crashed in 1948 while testing a prototype missile guidance system known as "suntracker". [37][30] The Bureau of Reclamation expects that the continued Colorado River basin drought will yield a Lake Mead level of 1,084.39 feet by 2022. Currently, Lake Mead is at an elevation of 1083 feet or 39-percent full." The scale was massive – such a large concrete structure had never been built before. Water levels in Lake Mead rose steadily to record levels between 1965 and 1983, and remained above average through 2002, even as temperatures were rising. Wednesday, December 23, 2020 12:00:00 AM Level is 116.41 feet below full pool of 3,700.00. Las Vegas Boat Harbor and Lake Mead Marina in Hemenway Harbor/Horsepower Cove remain open, along with Callville Bay Marina, Temple Bar Marina, Boulder Launch Area (former location of the Lake Mead Marina) and the South Cove launch ramp.[41]. Historical Reservoir Levels (updated monthly) Lake Mead Lake Mohave Lake Havasu Lake Mead High/Low Elevation Graphs Line graph with text data Bar graph with text data Historical Flow Below Hoover Dam (graphs) Line graph. Updated: Thursday, December 17, 2020 - 8:22am. [31] As a result of the large snowmelt, the lake regained the water levels it had in 2015 with a seasonal high of 1,089.77 feet (332.16 m). Chart shows daily levels for 2017 (red), 2018 (green) and so far this year (blue). Lake Mead hit a record high elevation of 1,220 feet above sea level in the summer 1941, just five years after completion of the dam, but the level has fluctuated and been in decline ever since. Formed by the Hoover Dam on September 30, 1935, the reservoir serves water to the states of Arizona, California, and Nevada, as well as some of Mexico, providing sustenance to nearly 20 million people and large areas of farmland.[1]. 1,083.44. Briefly, this critical shortage level will automatically trigger emergency measures agreed on by the seven nearby states that depend on Lake Mead's water — including rationing. Bacterial levels in water at Lake Mead, Lake Mohave beaches unsafe for humans Cody Miller 8/1/2020. Feet MSL. The model’s median estimates indicate Lake Mead will drop by 35 feet (11 meters) by 2026. In addition, the Alan Bible Visitor Center hosts the Alan Bible Botanical Garden, a small garden of cactus and other plants native to the Mojave Desert. Friday, December 25, 2020 12:00:00 AM Level is 116.71 feet below full pool of 3,700.00. The city will still get water even if lake levels fall below what’s known as “dead pool” or the level below which water would no longer flow past Hoover Dam. [2][3][4] As of April 2020[update], Lake Mead held 42.97% of full capacity with 11.3 million acre feet (1.39×1013 L), up from 10.4 million acre feet (1.28×1013 L) in 2019 and the low of 9.8 million acre feet (1.21×1013 L) 2016. Melting snow raises the lake in the spring, while evaporation and siphoning of irrigation water lowers the level in summer. There are plenty of tips at the end of the Calculator that will help you find out how to lower your water footprint, a critical action if we’re going to learn to live with the “bathtub ring,” and try to use the Colorado River – and all of our other rivers – sustainably, now and into the future. [14] The ruins of St. Thomas are sometimes visible when the water level in Lake Mead drops below normal. In addition, two small basins, the Muddy River Inlet and the Virgin River Basin, are flooded when the lake is high enough where these two rivers flow into the lake. Hoover Dam Bypass. Yet a 7.48 million acre-feet release in water year 2022, which begins in October 2021, could drop levels on Lake Mead by nearly 20 feet. Ongoing Programs & Activities. The decreasing water level is due to the loss of the surplus water that once made up for the annual overdraft. Lake Mead was established as the Boulder Dam Recreation Area in 1936 administrated by the National Park Service. Tier Zero is a threshold, created under new rules from the Drought Contingency Plan (DCP) that mandates Arizona and Nevada modestly reduce the water they take from the Colorado River. While I was there, my colleagues and I took a quick tour of Hoover Dam and Lake Mead. Learn how and when to remove this template message, List of reservoirs and dams in the United States, "Drought: Lake Mead is at an Historic Low", "Bureau of Reclamation: Lower Colorado Region – Hoover Dam: Lake Mead FAQs", "Historic Data | Water Operations | UC Region | Bureau of Reclamation", https://research.wsulibs.wsu.edu:8443/xmlui/handle/2376/3419, "Boulder Dam Recreation Area: The Bureau of Reclamation, the National Park Service, and the Origins of the National Recreation Area Concept at Lake Mead, 1929-1936", "Lake Mead National Recreation Area: Historic Timeline", "Utilization of Waters of the Colorado and Tijuana Rivers and of the Rio Grande: Treaty Between the United States of America and Mexico", "Lake Mead At Hoover Dam, End of Month Elevation (FEET)", "Lower Colorado River Operations - Lower Colorado Region - Bureau of Reclamation", "Additional Water to be Released from Lake Powell to Lake Mead, Avoiding Shortages in Lower Basin in 2012", "Reclamation Forecasts Low Lake Powell Water Release for 2014", "Lake Mead sinks to record low, risking water shortage", "Colorado River Reservoirs Start Water Year At Lowest Point Since Filled", "Lake Mead Drops to its Lowest-Ever Level", "Lake Mead skirts shortage for another year", "LAKE MEAD AT HOOVER DAM, END OF MONTH ELEVATION (FEET)", "Full snowpack cause small increase for Lake Mead water levels, but Nevada still in drought", "Latest forecast shifts Lake Mead from big gain to small loss", "Unprecedented Colorado River Water Shortage Could Be Declared in 2020", "Water table expected to lower at Lake Mead, despite denser snowpac", "Reclamation's Colorado River Basin inflow projections reflect improved hydrological conditions in 2019", "Water table expected to lower at Lake Mead, despite denser snowpack", "Drought Diminishes Hydropower Capacity in Western U.S.", "Storage Capacity of Lake Mead - Lake Mead National Recreation Area (U.S. National Park Service)", "The water czar who reshaped Colorado River politics", "Last Straw: How The Fortunes Of Las Vegas Will Rise Or Fall With Lake Mead", https://www.bassmaster.com/news/events-changed-bass-fishing, New Historical Novel Tells Story Of Evacuation Of St. Thomas, "Natural Resources: "Historical and current water levels in Lake Mead", "Lake Mead elevation at Hoover Dam: monthly from Feb. 1935 to present", "Lower Colorado Region: Daily data of level and flow", International Boundary and Water Commission, Metropolitan Water District of Southern California, https://en.wikipedia.org/w/index.php?title=Lake_Mead&oldid=996198867, Reservoirs and dams in National Park Service units, Tourist attractions in Clark County, Nevada, CS1 maint: BOT: original-url status unknown, Short description is different from Wikidata, Articles using infobox body of water without alt, Articles using infobox body of water without image bathymetry, Articles containing potentially dated statements from April 2020, All articles containing potentially dated statements, Articles needing additional references from October 2018, All articles needing additional references, Wikipedia articles with WorldCat-VIAF identifiers, Creative Commons Attribution-ShareAlike License, This page was last edited on 25 December 2020, at 02:40. The last time Lake Mead was this low—in 1937—water managers were still filling the reservoir and putting finishing touches on the Hoover Dam. Las Vegas Bay is the terminus for the Las Vegas Wash which is the sole outflow from the Las Vegas Valley. Lake Mead NRA recommends wearing shoes at the beaches. If the lake is below this elevation at the beginning of the water year, an official shortage declaration by the Bureau of Reclamation will enforce water rationing in Arizona and Nevada. Das Kraftwerk erzeugt mehr als 4 Mrd. Lake Mead’s elevation is around 1,092 feet, which is the highest it has been since May 2014, but it is still only 42% full, said Patti Aaron, public affairs officer for the bureau’s Lower Colorado Basin Region. Bountiful snow in the Rocky Mountains last winter buoyed levels in Lake Mead and Lake Powell, ... Nevada and California as well as Mexico — agreed to leave more water in Lake Mead when the reservoir dipped below certain levels starting at 1,090 feet, which is an elevation, not a depth. In total, the Colorado River provides water to nearly 40 million people for municipal and agricultural uses, seven National Wildlife Refuges, four National Recreation Areas and 11 National Parks. Generally, after the winter thaw, the water is deepest in the spring months. A A. The Virgin River and Muddy River empty into the Overton Arm, which is connected to the northern part of the Virgin Basin. Lake Mead receives the majority of its water from snow melt in the Colorado, Wyoming, and Utah Rocky Mountains. 10-Day Lake Mead Outlook (updated daily) Daily Elevation Projections Operations Outlook (updated weekly) River Operations Schedule Lake Mead/Hoover Dam Lake Mohave/Davis Dam Lake Havasu/Parker Dam 2-Year Projected Operations 24-Month Study Current (updated monthly) 24-Month Study Archives (2010 to present) Lake Powell and Lake Mead 5-Year Projected Conditions Current … In reality, Lake Mead is the largest man-made lake and reservoir in the U.S.A. 3. Lake Mead's water elevation increased from 1,095.5 to 1,134.52 feet after a heavy snowmelt in the Rocky Mountains in 2011.They were worried it might increase higher so they opened the overflow tunnels. This lake is actually a man-made reservoir that was created as a result of the construction of the Hoover Dam. It also can provide more than 4,200 megawatts of electricity from hydroelectric facilities like the Hoover Dam. That’s 14 feet above the level … Bacterial levels in water at Lake Mead, Lake Mohave beaches unsafe for humans. A lake level of just 1,075 feet is also problematic because it is only 25 feet above the water intake tunnel for the city of Las Vegas, which relies so heavily on Lake Mead. [38], As a result of the decreasing water level, marinas and boat launch ramps have either had to be relocated to another area of the lake or have closed down permanently. Last July, Lake Mead reached its lowest water level since the lake was first filled after the construction of the Hoover Dam in the 1930s, according to the Bureau of Reclamation. As the dry season begins, the water level can drop steeply between April and July, with July typically having the lowest levels. After 37 years of abundance, some decline was bound to eventually occur.
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