(We forgot to say that youll have to string some cables and pulleys across the canyon to let stuff down to bottom. 2. Gunderson: We have installed vehicle checkpoints; one on the Nevada side, and one on the Arizona side. Why Security+ Is Right for You, Especially Since Its Remake What benefits would a new dam provide? Would Hoover Dam be on their list? The total capacity at Hoover is now 1,617 megawattsa 20 percent decrease from its designed capacity of 2,080 megawatts. instructions on Look carefully at this image. Ultimately, they managed to agree on a document, called the Colorado River Compact. Which job would have been the most dangerous? They contribute to the economic development of the United States and to the social welfare of the American public. This morphing climate, plus the rampant extraction of water for everything from golf courses in Phoenix to vegetables growing in California to gardens in Denver, means the Colorado fizzles out in dry riverbed before it even reaches its Mexican delta. How many of your classrooms would it take to hold 1.5 million cubic yards? Ask each group to report back to the class. In addition to the 10,000 people who braved 102o heat to hear the speech in person, it was broadcast to a radio audience of millions of people. 4 Most had to travel many miles, at the end through a hostile desert, to reach this location on the border between Nevada and Arizona. Humans have always been good at moving water around but right now everyone will need to do what it takes to prevent the system from crashing.. 7 Things You Might Not Know About the Hoover Dam - HISTORY 1. This image shows three views of the dam. Ask each group to select a job and do some research on it. The proposed dam would be so tall and the pressure of the water it held back so great that many people were worried. Constructed by the Bureau of Reclamation to meet the requirements of the 1944 Treaty with Mexico, Davis Dam was originally created to regulate the amount of water to be delivered downstream and eventually to Mexico. Can you trace the course the water follows from the reservoir through the power plants and outlet works and then back into the river? No one is buried in Hoover Dam. Private vehicles are allowed to cross after the vehicle is inspected. It once was the Earth's tallest dam. To hurry it up, string two or three miles of water pipe around through each five-foot layer of concrete as you pour it. Standard E - The student identifies and describes the basic features of the political system in the United States, and identifies representative leaders from various levels and branches of government. First, a minor point. It stretched the abilities of its builders to the limits. Most of the states were afraid California was going to get more than its fair share of the water. How would their list compare with the original "Seven Wonders of the World" and with Corporal Ward's "Seven Wonders of the United States? Pouring the dam.Take cement, rock and sandmix welladd waterpour into canyon. The average high temperature in this area in August is 103 degrees. The Bureau of Reclamation, the federal agency that runs Hoover Dam, has not yet released more information, per The Associated Press.. In this lesson, students have learned why and how Hoover Dam was constructed. The name Reclamation will be used throughout this lesson to refer to both the U.S. Reclamation Service and the Bureau of Reclamation. Ill continue to watch the weather, every day., Lake Mead: largest US reservoir falls to historic low amid devastating drought, Original reporting and incisive analysis, direct from the Guardian every morning, Lake Mead behind the Hoover dam from the Arizona side. The dam was built in interlocking blocks. Hoover Dam PBS Film As you make each section of pipe, X-ray it for defects. 5. How many of them can you count? It came roaring down the canyons of the Colorado, through Grand Canyon, Iceberg and Boulder Canyons, but it was caught and safely held behind Boulder Dam. Then ask the students to gather information on changes in the volume of water flowing down Colorado River during that period. Across the desert and mountains to the west and south run great electric transmission lines by which factory motors, street and household lights and irrigation pumps will be operated in Southern Arizona and California. Visiting Hoover Dam ~ What You Should Know in Advance In the early 21st century, almost a million visitors a year still come to see the great dam on the Colorado River. Its main purpose is to staunch flooding, be a source of water for the arid deserts of Nevada, and provide a bit of hydroelectric power via a power station while it was at it. 3. From your ice plant, run ice cold brine through the pipes. Excavating.Lower steam shovels into the canyon. Finally, ask the students to consider what effect building a new dam might have on these problems. How 9-11 Shaped Hoover Dam Security Operations | CSO Online One of the definitions of "penstock" is a pipe or conduit that carries water from a reservoir to electrical generating equipment. Why were congressional representatives from the state of California the leading supporters of a big dam on the Colorado? The white bathtub ring around Lake Mead shows the record low water levels as drought continues to worsen in Nevada. Hoover Dam Bypass Bridge. We were waved by. It is just a bridge. Tickets can also be purchased on-line. The bridge is located high in the mountains above the dam. What were they? 6 Before you can safely anchor a dam on em, it will be necessary to scale off this unstable face. The canals and aqueduct in California receive water from the Colorado. For power generators, there will always be a need to have people on-site. On May 8, 1933, Ickes decided that the dam in Black Canyon would revert to being called Boulder Dam. Anyone who doesn't allow inspection of their vehicle is turned around. Refer to your textbook if necessary. Its construction, in the teeth of the Great Depression, was a source of such national pride that thousands of people journeyed through the hostile desert to witness the arrival of what has become an enduring monument to collective effort for the public good. Why do you think it was so important to do that before starting work on the dam structure itself? And you will need to build some roads and erect a power line. Most of the water in the Colorado comes from melting snow in the Upper Colorado Basin. Our choices were based on those which were obvious, from the list of the ancient world wonders, massive, man-made, and enduring. No sprawling food bowl of wheat, alfalfa and corn. Work on the dam began sooner than originally planned. Standard B - The student creates, interprets, uses, and distinguishes various representations of the earth, such as maps, globes, and photographs. That is why I have the right once more to congratulate you who have built Boulder Dam and on behalf of the Nation to say to you, "Well done." 4. Why do you think visitors would drive so far to watch the dam under construction? 4. What would have been the plusses? Six Companies came up with a number of new and ingenious ways to drill the four diversion tunnels more quickly, and one was the drilling jumbo. Eight of these jumbos were built, each mounted on the back of a 10-ton truck. 5. This lesson is one in a series that brings the important stories of historic places into classrooms across the country. Standard D - The student explains the need for laws and policies to govern scientific and technological applications, such as in the safety and well-being of workers and consumers and the regulation of utilities, radio, and television. The availability of water stored behind Hoover Dam and the power produced by that water played a critical role in the growth of the American Southwest in the mid-20th century, but the demand for more water and electricity soon outstripped what this one dam could provide. The huge dam on the Colorado captured the imagination of journalists, authors, and filmmakers. The lake extends about 110 miles upstream from the dam. BOULDER CITY, Nev. (KLAS) A fire Tuesday at the Hoover Dam has made headlines around the world, but the fire did not actually happen on or inside the dam. 2. Now for the issues. Describe the setting in these images. We all want the nice weather but we need those good storms to build everything back up, he said. 2. Take a canyonAny canyon several blocks deep, with a good sized river running through it, will do. This is the version of our website addressed to speakers of English in the United States. Hoover Dam | Bureau of Reclamation - usbr.gov To employ workers and materials when private employment has failed is to translate into great national possessions the energy that otherwise would be wasted. These new projects would also control floods, supply water to growing cities, and generate electricity to fuel industrial growth in a new West. It claimed the lives of 96 of the 21,000 men who worked on it. This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. The new bypass takes you right over it without and option to park and visit. 3. They hired and housed the workers. Once we got on the other side the traffic was stopped trying to get down in there. . The dams, particularly the Hoover Dam, were also intended to control the torrential floods that would come downstream in big water years. The company listings and photos are matched at the checkpoint. Why do you think it was called that? The jumbos backed up to the working faces in the tunnels so that men using all the drills could work at the same time and higher on the wall without the need for scaffolds. In the early 20th century, the U.S. Bureau of Reclamation devised plans for a massive dam on the Arizona-Nevada border to tame the Colorado River and provide water and hydroelectric . Standard I - The student explains the relationship between policy statements and action plans used to address issues of public concern. Not as exciting as the Grand Canyon but worth the visit. The amount of water in the lake, when full, could cover the whole state of Connecticut ten feet deep. They werent sure that even Reclamations engineers had enough knowledge and experience to make the dam strong and safe. 3. Hoover Dam, a concrete-arch gravity dam, captures water from the Colorado River and fills Lake Mead. Standard F - The student uses knowledge of facts and concepts drawn from history, along with methods of historical inquiry, to inform decision-making about and action-taking on public issues. There are 582 miles of cooling pipe in the am to control the temperature of the concrete and prevalent cracks. What were some of the concerns people had about its construction? But since 2000, scientists say the rivers flow has dwindled by 20% compared to the previous centurys average. This could be the tip of the iceberg, we may well see much longer, tougher droughts.. In addition to the Hoover Dam police force, the dam employs additional contract security personnel to man vehicle checkpoints on the Nevada and Arizona entrance points. Built during the Great Depression, Hoover Dam is one of America's great historical landmarks. Great Attraction - Too Much Security Theater - Review of Hoover Dam We also now prohibit commercial traffic access across the dam, with the exception of some local businesses. He spends two days each week at the Hoover in meetings to discuss how to improve security functions. The left side shows what a visitor looking upstream at the dam would actually see. 2. Ask the students to identify as many places as they can that have those characteristics. Information security has matured a great deal in only 10 years, seeing new focus on areas like identity management, risk management and governance. Located in Pyramid Canyon about 70 miles downstream from Hoover Dam, this zoned earth-fill dam consists of concrete . Questions for Reading 2 Weve known this point will arrive because weve continued to use more water than the river provides for years, said Kathryn Sorensen, a water policy expert at Arizona State University. Activity 1: Which Job Would You Want? Now drill holes through the cliffs from towers to power plant. That estimate has turned out to be too high, because the early 20th century was unusually wet while the period since then has been much drier. The bridge is located high in the mountains above the dam. The public feels . 5. Those managing dam security are bound by a host of government regulations and security standards including Homeland Security Presidential Directives and regulations and standards enforced by the North American Electrical Reliability Council (NERC). At capacity (1,221.4 feet above sea level), the lake is the nation's largest reservoir, able to contain 28.9 million acre-feet of water covering about 248 square miles. The dam is used for flood and silt control, hydroelectric . Hoover Dam | Bureau of Reclamation - usbr.gov The spillways at Hoover Dam are only used when the water in the reservoir is so high that it would otherwise overflow the top of the dam. They saw the dam as a potential source of water and hydroelectric power for homes, businesses, and factories. Drill holes connecting them with two of the tunnels constructed in Lesson 4. CSO: What security changes have been made at the Hoover Dam since 9/11? Simply drill four tunnels about miles through the cliffs above the water line. In 1938, a New York publisher put out an illustrated cartoon guide for tourists visiting Hoover Dam, then known as Boulder Dam. Hoover Dam - Water Education Foundation LESSON NO. Six Companies thought that building them was the most critical part of the project. Boulder Dam is a splendid symbol of that principle. LESSON NO. During a dark time, Hoover Dam seemed to transcend Americans fears about the future. 4) To identify some of the factors contributing to public perceptions of Hoover Dam and its construction. It supplies water and power to Los Angeles and other rapidly growing cities in the Southwest. Make this cofferdam about a hundred feet high, two blocks thick at the base and 70 feet thick on top. It did permit planning for the dam to proceed, however. There is a fee for parking. What other hazards do you think the men working on the jumbos might have faced? You have to climb 70 steps to get to it so be ready. 3. Check the Hoover Dam website for more detailed information, including seasonal hours of operation. The cut-away view on the right side shows features that would not be visible from the surface. According to Webster's Dictionary, "public works" are construction projects, such as water treatment plants, power plants, flood control systems, and highways and transportation networks that are built by the government for the public. Which states are they? Some marinas have been wrenched from their moorings and moved because they have been left marooned in baking sediment. The traditional and hard-hat tours were discontinued, and we now have more "top of dam" free tours with limited tour access into the dam itself. 5. What might people "miss" about these canyons if they were filled with water? Do you agree? To people who have not taken our engineering course, it seems pretty tough to dry out a river, but actually its a cinch. Measure your classroom and figure out how many cubic yards it could hold. Hoover Dam Suicides - HOOVER DAM Even if you dont go inside the dam with a full tour, you should consider stopping here. Wictionary website, accessed 1/30/2011. 5 in Reading 2. Why do you think he used the old name in his speech? All other commercial trafficspecifically, the large semis and busesare not allowed to cross and are turned around at the checkpoints. Securing The Hoover Dam | CSO Online It is just a bridge to a driver. Access control Brent Gunderson, regional security manager of the lower Colorado river region, worked at the Hoover Dam for four years and managed the police force. How many of the features mentioned in Reading 2 can you find in this image? Win $10,000 Toward A Solar Panel System | PCH.com Five of the 17 turbines, each weighing the same as seven blue whales, have been replaced in recent years with new fittings more suited to operating in lower lake levels. In 2010, in the United States there were 38,364 reported suicide deaths. Due to its peculiar structure, it caused a rare phenomenon. Its construction, in the teeth of the Great Depression, was a source of such national pride . We know that, as an unregulated river, the Colorado added little of value to the region this dam serves. LESSON NO. Firearms, Explosives and Fireworks are Prohibited at Hoover Dam per 43 CFR 423.30. The President identified benefits the new dam had already provided. Hoover Dam did, and continues to do, all the things its supporters hoped it would. Hoover Dam was both listed on the National Register of Historic Places in 1981, and was designated a National Historic Landmark in 1985. Very nice to visit; and see the dam in person. We know, too, that the reason for this speeding up was the need of giving relief to several million men and women whose earning capacity had been destroyed by the complexities and lack of thought of the economic system of the past generation. Huge aqueducts carry water from the Colorado to Los Angeles and other cities in Southern California. The wests ambitions have crunched into the searing reality of the Anthropocene. Standard C - The student locates, accesses, analyzes, organizes, and applies information about selected public issues--recognizing and explaining multiple points of view. Time period: Early to mid 20th century. Why was this work necessary? In 1905, the Colorado River flooded rich, irrigated farmland in the Imperial Valley in southern California. Activity 3: Hoover Dam and the Arid West Dam Safety | FEMA.gov Concrete has a nasty habit of cracking. Look at the upper right hand corner of the image. Have students list as many kinds of work as they can based on the readings and the images. . Dam Safety. At flood time, if the lake rises high enough to reach the spillways, it can be turned out through these original tunnels. The area is also prone to cloudbursts, high winds, and sudden floods. This morning I came, I saw and I was conquered, as everyone would be who sees for the first time this great feat of mankind. Commercial vehicle traffic across the dam is restricted. Where does it end? It protects southern California and Arizona from the disastrous floods for which the Colorado had been famous. How much money has been allotted to secure the dam? If the two don't match, the vehicle is turned away. This website, provided by the National Archives and Records Administration, features a 1981 film that combines three short films dating from earlier periods. . Remember that temperatures regularly exceed 90 degrees on the hottest days, and bring lots of water with you. In the dry months of the year it shrank to a trickling stream. Hoover Dam: Hoover Dam tour ruined by Dam security! Gregson said many of the security controls, including such things as the checkpoints and command center, were instituted in direct response to the 9-11 terrorist attacks. California: Parker Dam (U.S. National Park Service) The rivers and streams shown on this map all flow into the Colorado River. This website features images and other information focusing on the people who built Hoover Dam and who lived in Boulder City. Reread Lesson No. Continue on US 93 for about 5 miles to the turn-off to Nevada State Route 172the Hoover Dam Access Road. The short answer: no, yes, further than you think, a half-day, yes. It was one of the most ambitious projects of the early 20th century, requiring millions of cubic feet of concrete and tens. Seen from above in time lapse over the years, Lake Mead looks like a spindly puddle withering away in the Mojave Desert, as nearby Las Vegas, which gets almost all of its water from the lake and went a record 240 days last year without rain, balloons in size. If cracks were to appear in your dam it might cause severe criticism from people living below the damor from their heirs. Hoover Dam is as tall as a 60-story building. You will go about 20 mph. Standard G - The student applies knowledge of how groups and institutions work to meet individual needs and promote the common good. This year is the second driest on record, with the flow into Lake Mead just a quarter of what would be considered normal. By this time, however, Reclamation's objective was changing and expanding. 2. They are critical to the functioning of modern communities, but few people notice them unless something goes wrong. Hoover dam is the height of a 60-story building and is 45ft thick at the top and 660ft at the bottom. We inspect vehicles, whether full or empty. Initially the agency built some relatively small dams on the rivers tributaries. Trace the course of the Colorado River. How do you think they might have done this work without the jumbos? Preliminaries.Before you can start on the dam, it will be necessary to build a town. Is it time to think about removing dams on the Colorado River? Was it? The new legislation created a federal program to bring water to the desert lands of the West by constructing dams and reservoirs to store water for irrigation, as well as canals to deliver that water to farms. Building such a mammoth structure presented unprecedented challenges to the engineers of the Bureau of Reclamation. Why was it important to speed up the cooling process? This will provoke a second, harsher, round of cuts. Access to the Visitor Center is most convenient from the parking garage on the Nevada side of the dam. Bureau of Reclamation History Drought suggests to a lot of people something temporary we have to respond to, but this could permanently be the type of flows we see.. How does that change if the level of the reservoir is getting too high? Can you think of ways to translate those numbers into comparisons with more familiar things, so that it would be easier to get a sense of how big the project was? By this time, Franklin D. Roosevelt, a Democrat, had been elected president. Such expenditures on all of these works, great and small, flow out to many beneficiaries; they revive other and more remote industries and businesses. It also includes images showing the installation of the last turbine in the power plant and the benefits provided by the dam. Dams play a vital role in the nation's overall infrastructure. The amount of concrete used in building it was enough to pave a road stretching from San Francisco to New York City. Then divide the class into small groups. Others may be simply old. Visitors with prohibited items will be turned away at the Nevada Security Checkpoint. The lake it created would be the largest in the world. Inside the Arizona powerhouse are nine massive generators. They represent and embody the accumulated engineering knowledge and experience of centuries; and when we behold them it is fitting that we pay tribute to the genius of their designers. Ask students to investigate how the places supplied by Hoover Dam have grown since 1935. Today we translate them into a great national possession. Used by permission). Why or why not? This will cause the mass to cool and shrink quickly. Davis Dam. ScalingAfter standing out in the weather so long, canyon walls become soft and decayed on the surface. The tour began at the Hoover Dam Police Department in the Security Command Center, where the security staff monitors the various security, access control, and communications systems on a 24/7 basis. Today marks the official completion and dedication of Boulder Dam. They paid for all supplies and inspected the contractors work. All visitors, or anyone doing business at the dam, are required to pass through magnetometers and X-ray screening. Under The Bridge The. They transported supplies to the dam site. 1. Why do you think they did that? There are many canyons on the river, some almost as dramatic as the Grand Canyon, located just upstream from Hoover Dam's reservoir. 1) One map showing the Colorado River Basin; At the gate are several agents and they can wave you by or pull you over. The inspection can result in some traffic/delay in getting there, so account for that in your planning. They were responsible for keeping the project on schedule and within budget. Parker Dam is on the Colorado River, 155 miles downstream from Hoover Dam. The permit allows them to show up. A few hundred miles north, a fast-moving wildfire incinerated the town of Lytton in British Columbia the day after it set a Canadian temperature record of 121F (49.4C). The pace of change has been jarring to the millions of people who regularly boat, fish and swim on the lake, with the National Park Service recently laying down new steel platforms to extend launch ramps that no longer reach the water. Standard F - The student describes physical system changes such as seasons, climate and weather, and the water cycle and identifies geographic patterns associated with them. I think the biggest concern with airports instead of ships or busses or trains is that you can't really e. How many men can you count in Photo 1? Why do you think Six Companies disregarded the state law? Each spillway, designed to let floodwaters pass without harming the dam itself, can handle the volume of water that flows over Niagara Falls. Unpredictable flash floods could occur in any season. Long after Sept. 11, life at Hoover Dam isn't normal / Security What might be the advantages of each type of ownership? Intake towers and power house.Build four intake towers on the upstream side of the dam, being sure that the top of em is above the high water line. There are two places where the river forms the boundary between two states. It supplies water to irrigation projects in California and Arizona. They should be able to get population data for the states and cities listed above. kentucky snowfall records; why is there so much security at the hoover dam. In the early 21st century, almost a million people still come to visit the huge dam every year. Simple? By this time, they were among the most knowledgeable and experienced dam builders in the world, but even they had never done anything this big. We inspect all "closed" vehicles, large trucks, buses and RVs 100 percent of the time. It is just another bridge even though the engineering that went into it was amazing. They stretch for some 124 miles (200 kilometers) along the upper and middle reaches of the . Which group's contributions do you think he valued the most? Assorted steam shovels, etc.you'll have to move about 6 million cubic yards of rock and dirt, digging tunnels and whittling out the canyon walls to make room for the dam. In addition to directions and information about touring the dam, it includes links to The Story of Hoover Dam, a series of essays on construction of the dam, a database of hundreds of historic images, and a packet of educational materials. Describe the shelter shown in Photo 2. The dam stands 60-stories tall (726.4 feet) The base of the dam is two football fields thick. Standard D - The student identifies and uses processes important to reconstructing and reinterpreting the past, such as using a variety of sources, providing, validating, and weighing evidence for claims, checking credibility of sources, and searching for causality. One of the definitions of the word "reclamation" is "the recovery of a wasteland or of flooded land so it can be cultivated." A dam's electrical output is partly a function of the height of its reservoir. The materials listed below can be used directly on the computer or printed out, photocopied, and distributed to students. Look for the drills (they look a little like machine guns). Explain your answer. #4 - Las Vegas, NV - stay in the heart of it all for the casinos, shows and nightlife, then, take a tour of the Hoover Dam and the Grand Canyon for memories that last a . Corporal Joe Ward . Divide the class into seven small groups.
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