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When workers wearing such headgear were struck hard enough to inflict broken jaws, they sustained no skull damage. "[71] At one point in the speech, he spoke the words "Boulder Dam" five times within thirty seconds. True's design scheme incorporated motifs of the Navajo and Pueblo tribes of the region. [74] The first was surveyor John Gregory ("J.G.") [3] The jet-flow gates, located in concrete structures 180 feet (55 m) above the river and also at the outlets of the inner diversion tunnels at river level, may be used to divert water around the dam in emergency or flood conditions, but have never done so, and in practice are used only to drain water from the penstocks for maintenance. [3], Before water from Lake Mead reaches the turbines, it enters the intake towers and then four gradually narrowing penstocks which funnel the water down towards the powerhouse. The final generator was not placed in service until 1961, bringing the maximum generating capacity to 1,345 megawatts at the time. New holes were drilled from inspection galleries inside the dam into the surrounding bedrock. The ones I have presented to them is New York New York, Monte Carlo (both are centrally located) and I … He designed sculpted turrets rising seamlessly from the dam face and clock faces on the intake towers set for the time in Nevada and Arizona—both states are in different time zones, but since Arizona does not observe daylight saving time, the clocks display the same time for more than half the year. When Ickes spoke at the dedication ceremony on September 30, 1935, he was determined, as he recorded in his diary, "to try to nail down for good and all the name Boulder Dam. If the dam was not completed in the given time it would have cost the contractors $ 3000 / day in financial penalties. Pending the completion of the bypass, restricted traffic was permitted over Hoover Dam. [101], Lake Mead and downstream releases from the dam also provide water for both municipal and irrigation uses. Gary M. As the required grade of aggregate in the concrete differed depending on placement in the dam (from pea-sized gravel to 9 inches (230 mm) stones), it was vital that the bucket be maneuvered to the proper column. The first death happened in 1922 during one of several geological survey missions along the Colorado River. Concerned that a violent confrontation was imminent, most workers took their paychecks and left for Las Vegas to await developments. The workers were given until 5 p.m. to vacate the premises. Edison allowed land options it held on the river to lapse—including an option for what became the site of Hoover Dam. As the United States developed the Southwest, the Colorado River was seen as a potential source of irrigation water. The Hoover Dam was built by a construction company called Six Companies Inc, which was actually a consortium of several commercial construction companies: Morrison-Knudsen Co., Utah Construction Co., J. F. Shea Co., Pacific Bridge Co., MacDonald &Kahn Ltd. and a joint venture of W. A. Bechtel Co., Henry J. Kaiser, … The torrid summer weather and lack of facilities near the site also presented difficulties. [79] The site's diversion tunnels frequently reached 140 °F (60 °C), enveloped in thick plumes of vehicle exhaust gases. The new arrangement began on October 1, 2017. [127] One writer complained in response that "the Great Engineer had quickly drained, ditched, and dammed the country."[127]. In March 1932, work began on lining the tunnels with concrete. No deaths of non-workers from pneumonia were recorded in Boulder City during the construction period. Travelling and Safety: Crossing Hoover Dam: A Traveler's Guide … [73][89] The 30-foot-high (9.1 m) bronze figures, dubbed "Winged Figures of the Republic", were both formed in a continuous pour. "[133] Ickes, who was by then a private citizen, opposed the change, stating, "I didn't know Hoover was that small a man to take credit for something he had nothing to do with. [11], In 1922, the Reclamation Service presented a report calling for the development of a dam on the Colorado River for flood control and electric power generation. [3] The annual generation of Hoover Dam varies. Work on the upper cofferdam began in September 1932, even though the river had not yet been diverted. [55], When the cofferdams were in place and the construction site was drained of water, excavation for the dam foundation began. On September 30, 1935, Hoover Dam, originally named the Boulder Dam, was dedicated by President Franklin Roosevelt.Surrounded by a crowd of 10,000 people, the massive concrete dam, stretching 1,244 feet across the Black Canyon, sat on the Arizona–Nevada border as the largest dam in the world at the time of its completion. 127-50 Northern Blvd Flushing, NY 11368 p: 718.446.7000 f: 718.446.6072 [5], Dam in Clark County, Nevada and Mohave County, Arizona, US, "Boulder Dam" redirects here. [110] The 1941 damage was attributed to a slight misalignment of the tunnel invert (or base), which caused cavitation, a phenomenon in fast-flowing liquids in which vapor bubbles collapse with explosive force. Each spillway's capacity of 200,000 cu ft/s (5,700 m3/s) was empirically verified in post-construction tests in 1941. Reviewed in the United States on June 11, 2016. The Nevada Southern Railway is the last remaining stretch of the historic train tracks used to build the Hoover Dam. Hoover Dam is a colossal hydroelectric dam on the Colorado River, on the border between Nevada and Arizona. A decade in pictures: Iconic stories, photos and covers of the 1990s, In memoriam: Remembering the famous figures we lost in 2020, Winter fun: Stars enjoy the colder weather, A decade in pictures: Iconic stories, photos and covers of the 1980s, 25 New Year’s resolutions that are actually achievable, A decade in pictures: Iconic stories, photos and covers of the 1950s, Sneak peek at the 'Coming 2 America' movie. [68] Despite the change in the ceremony time, and temperatures of 102 °F (39 °C), 10,000 people were present for the President's speech, in which he avoided mentioning the name of former President Hoover,[69] who was not invited to the ceremony. Movable sections of steel forms were used for the sidewalls. [71] After the ceremony, Roosevelt made the first visit by any American president to Las Vegas. [50] Concrete cores were removed from the dam for testing in 1995; they showed that "Hoover Dam's concrete has continued to slowly gain strength" and the dam is composed of a "durable concrete having a compressive strength exceeding the range typically found in normal mass concrete". Built during the Great Depression, between 1931 and 1936, the Hoover Dam—then known as the Boulder Dam—was one of the biggest construction projects of the era. [9], As the technology of electric power transmission improved, the Lower Colorado was considered for its hydroelectric-power potential. Hoover Dam impounds Lake Mead, the largest reservoir in the United States by volume (when it is full). Wilbur justified his choice on the ground that Hoover was "the great engineer whose vision and persistence ... has done so much to make [the dam] possible". Las Vegas grew considerably and Six Companies Inc. built Boulder City, Nevada to house the workers. The dam was described in minute detail, covering 100 pages of text and 76 drawings. [103][104][105], Electricity from the dam's powerhouse was originally sold pursuant to a fifty-year contract, authorized by Congress in 1934, which ran from 1937 to 1987. Comment Report abuse. An enormous concrete arched structure, measuring over 725 feet high and 1,244 feet long, the dam cost 49 million dollars to complete and was responsible for over 100 … Although the workers sent the organizers away, not wanting to be associated with the "Wobblies", they formed a committee to represent them with the company. Widths of the blocks varied from … The entire flow of the Colorado River passes through the turbines. Grout was also used to fill the hairline spaces between columns, which were grooved to increase the strength of the joints. [61] It took nine years (1938–47) under relative secrecy to complete the supplemental grout curtain. The project was begun in March 1931 and President Franklin D. Roosevelt dedicated it on September 30, 1935. As a result, few of True's decorations can now be seen by visitors. [44] On August 7, 1931, the company cut wages for all tunnel workers. [96], The amount of electricity generated by Hoover Dam has been decreasing along with the falling water level in Lake Mead due to the prolonged drought in the 2010s and high demand for the Colorado River's water. [56], The men who removed this rock were called "high scalers". The Story of Hoover Dam - Articles. [81] Kaufmann greatly streamlined the design and applied an elegant Art Deco style to the entire project. When an individual block had cured and had stopped contracting, the pipes were filled with grout. [60] After the dam was completed and the lake began to fill, large numbers of significant leaks into the dam caused the Bureau of Reclamation to look into the situation. [121], The Colorado River had experienced natural flooding before the construction of the Hoover Dam. [15] Despite the site change, the dam project was referred to as the "Boulder Canyon Project". A $2 million bid bond was to accompany each bid; the winner would have to post a $5 million performance bond. The Hoover Reservoir was built on Big Walnut Creek in the early 1950s in the Westerville area and spans Franklin and Delaware counties. Hoover Dam. The Boulder Dam worker of 1953 is a national type of … Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. Free with Kindle Unlimited membership Learn More Or $2.99 to buy. [95] 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. [111], There are two lanes for automobile traffic across the top of the dam, which formerly served as the Colorado River crossing for U.S. Route 93. The dam is not listed among the world’s largest dams, but it is certainly among the tallest, with its heavy concrete walls being 222 meters high. The BCPA merely allows the government to "construct, operate, and maintain a dam and incidental works in the main stream of the Colorado River at Black Canyon or Boulder Canyon". The parties came to an agreement and on March 1, 1936, Secretary Ickes formally accepted the dam on behalf of the government. As that dam was a curved-gravity type,[20] similar in design to the arch-gravity as was proposed for the Black Canyon dam, opponents claimed that the Black Canyon dam's safety could not be guaranteed. This is intended to help future astronomers, if necessary, calculate the exact date of dedication. Six Companies ordered thousands of what initially were called "hard boiled hats" (later "hard hats") and strongly encouraged their use. The concrete lining is 3 feet (1 m) thick, reducing the finished tunnel diameter to 50 ft (15 m). All in all, Hoover Dam stood 725 feet high, is 1244 feet wide, 660 feet thick at the base, tapering to a thickness of 45 feet at the top. Hoover Dam is a major tourist attraction; nearly a million people tour the dam each year. It contained 650,000 cubic yards (500,000 m3) of material. The Bureau of Reclamation, more concerned with the dam's functionality, adorned it with a Gothic-inspired balustrade and eagle statues. He was noncommittal. This is an amazing video. The dam… They lacked sufficient resources even in combination with their longtime partners, Morrison-Knudsen, which employed the nation's leading dam builder, Frank Crowe. Hoover Dam began operations in 1936. Included in the fatality list are three workers who took their own lives on site, one in 1932 and two in 1933. It is 660 feet thick at its base, 45 feet thick at its crest, and stretches 1,244 feet across Black Canyon. [26], On January 10, 1931, the Bureau made the bid documents available to interested parties, at five dollars a copy. [36] "Mongolian" (Chinese) labor was prevented by the construction contract,[36] while the number of blacks employed by Six Companies never exceeded thirty, mostly lowest-pay-scale laborers in a segregated crew, who were issued separate water buckets. It was dedicated on September 30, 1935, by President Franklin D. Roosevelt. Hoover Dam, one of the tallest dams in the United States and a National Historic Landmark that draws tourists from across the globe, is a key reservoir providing flood control, water storage and irrigation along the lower Colorado River.It also is one of the nation’s largest hydroelectric facilities, … Even after the waterway was stabilized, it proved unsatisfactory because of constant disputes with landowners on the Mexican side of the border. [106], The Bureau of Reclamation reports that the energy generated under the contracts ending in 2017 was allocated as follows:[3], Tourists gather around one of the generators in the Nevada wing of the powerhouse to hear its operation explained, September 1940, A worker stands by the 30 ft (9.1 m) diameter Nevada penstock before its junction with another penstock that delivers water to a turbine, The dam is protected against over-topping by two spillways. When a Six Companies manager altered working times to force workers to take lunch on their own time, workers responded with a strike. It impounds one of the largest reservoirs (by volume) in the United States. In 1922, after considering it for several years, the Reclamation Service finally rejected the proposal, citing doubts about the unproven technique and questions as to whether it would, in fact, save money. This town became known as Boulder City, Nevada. The dam is an arch gravity structure rising 726 feet above bedrock. [48], A second labor action took place in July 1935, as construction on the dam wound down. Finally, using pneumatic guns, the overheads were filled in. Hoover Dam was constructed between 1931 and 1936. [46] Two days later, the remainder were talked into leaving by law enforcement. Hansen designed many of the sculptures on and around the dam. On July 7, 1930, construction of the Hoover Dam, originally called the Boulder Dam, began in Black Canyon on the Colorado River on the border of Nevada and Arizona. They formed a joint venture to bid for the project with Pacific Bridge Company of Portland, Oregon; Henry J. Kaiser & W. A. Bechtel Company of San Francisco; MacDonald & Kahn Ltd. of Los Angeles; and the J.F. To lower the minimum power pool elevation from 1,050 to 950 feet (320 to 290 m), five wide-head turbines, designed to work efficiently with less flow, were installed. 3.9 out of 5 stars 44. On this day in 1930, construction of the Hoover Dam begins. [75][76][77] Of the 112 fatalities, 91 were Six Companies employees, three were Bureau of Reclamation employees, and one was a visitor to the site; the remainder were employees of various contractors not part of Six Companies. [126], When Secretary of the Interior Ray Wilbur spoke at the ceremony starting the building of the railway between Las Vegas and the dam site on September 17, 1930, he named the dam "Hoover Dam", citing a tradition of naming dams after Presidents, though none had been so honored during their terms of office. Overall, there is enough concrete in the dam to pave a two-lane highway from San Francisco to New York. [58] To protect themselves against falling objects, some high scalers took cloth hats and dipped them in tar, allowing them to harden. [114] It includes a composite steel and concrete arch bridge, the Mike O'Callaghan–Pat Tillman Memorial Bridge, 1,500 ft (460 m) downstream from the dam. [30], The city of Las Vegas had lobbied hard to be the headquarters for the dam construction, closing its many speakeasies when the decision maker, Secretary of the Interior Ray Wilbur, came to town. The morning of the dedication, it was moved forward three hours from 2 p.m. Pacific time to 11 a.m.; this was done because Secretary of the Interior Harold L. Ickes had reserved a radio slot for the President for 2 p.m. but officials did not realize until the day of the ceremony that the slot was for 2 p.m. Eastern Time. Emboldened by Crowe's reversal of the lunch decree, workers raised their demands to include a $1-per-day raise. [16] The Boulder Canyon Project Act of 1928 (BCPA) never mentioned a proposed name or title for the dam. [28] The joint venture was called Six Companies, Inc. as Bechtel and Kaiser were considered one company for purposes of Six in the name. Instead, the ground where the dam would rise was marked with rectangles, and concrete blocks in columns were poured, some as large as 50 ft square (15 m) and 5 feet (1.5 m) high. [67], With most work finished on the dam itself (the powerhouse remained uncompleted), a formal dedication ceremony was arranged for September 30, 1935, to coincide with a western tour being made by President Franklin D. Roosevelt. Water released from the Hoover Dam eventually reaches several canals. [99] Water levels were maintained at over 1,075 feet (328 m) in 2018 and 2019. The resulting Colorado River Compact was signed on November 24, 1922. The wedge-shaped dam would be 660 ft (200 m) thick at the bottom, narrowing to 45 ft (14 m) at the top, leaving room for a highway connecting Nevada and Arizona. In response to this finding, the tunnels were patched with special heavy-duty concrete and the surface of the concrete was polished mirror-smooth. In addition, 1,110,000 cu yd (850,000 m3) were used in the power plant and other works. Gantry cranes, running on rails through the entire length of each tunnel were used to place the concrete. During peak production, concrete buckets were delivered every 78 seconds.The Hoover Dam’s base required 230 blocks of concrete, each block five feet in height. The dam closed on November 25, 1963, and March 31, 1969, days of mourning in remembrance of Presidents Kennedy and Eisenhower. [111] The spillways were modified in 1947 by adding flip buckets, which both slow the water and decrease the spillway's effective capacity, in an attempt to eliminate conditions thought to have contributed to the 1941 damage. The map depicts the Northern Hemisphere sky at the moment of President Roosevelt's dedication of the dam. After a catastrophic breach that caused the Colorado River to fill the Salton Sea,[8] the Southern Pacific Railroad spent $3 million in 1906–07 to stabilize the waterway, an amount it hoped in vain would be reimbursed by the federal government. The Colorado River Board found the project feasible, but warned that should the dam fail, every downstream Colorado River community would be destroyed, and that the river might change course and empty into the Salton Sea. [59], The cleared, underlying rock foundation of the dam site was reinforced with grout, forming a grout curtain. Arthur Powell Davis, an engineer from the Bureau of Reclamati… On March 12, 1928, the failure of the St. Francis Dam, constructed by the city of Los Angeles, caused a disastrous flood that killed up to 600 people. The Hoover Dam is a historical and engineering wonder of America, so check out 21 rare photos from it's construction in 1936. This was done to stabilize the rock, to prevent water from seeping past the dam through the canyon rock, and to limit "uplift"—upward pressure from water seeping under the dam. [12] The river would carry off the smaller pieces of debris, and a dam would be built incorporating the remaining rubble. [54] The cofferdams were designed to protect against the possibility of the river's flooding a site at which two thousand men might be at work, and their specifications were covered in the bid documents in nearly as much detail as the dam itself. [92] To make the powerhouse roof bombproof, it was constructed of layers of concrete, rock, and steel with a total thickness of about 3.5 feet (1.1 m), topped with layers of sand and tar. However, at the time, the limit of transmission of electric power was 80 miles (130 km), and there were few customers (mostly mines) within that limit. [117] Visitors can only purchase tickets on-site and have the options of a guided tour of the whole facility or only the power plant area. The monolithic dam would be thick at the bottom and thin near the top, and would present a convex face towards the water above the dam. Holes were driven into the walls and base of the canyon, as deep as 150 feet (46 m) into the rock, and any cavities encountered were to be filled with grout. As he watched the bridge sprout high into the air … [45], On the morning of the 9th, Crowe met with the committee and told them that management refused their demands, was stopping all work, and was laying off the entire work force, except for a few office workers and carpenters. The name was descriptive and was an inside joke among the San Franciscans in the bid, where "Six Companies" was also a Chinese benevolent association in the city. Originally called “Boulder Dam”, it was renamed Hoover Dam after congress voted to make the name official in 1947. A total of 112 deaths are attributed to the Hoover Dam’s construction, several of which occurred during pre-construction surveys of the area. Hoover Dam 75th Anniversary - Photographs, a video, and media coverage of the September 30, 2010 event at the dam. [93], In the latter half of 1936, water levels in Lake Mead were high enough to permit power generation, and the first three Allis Chalmers built Francis turbine-generators, all on the Nevada side, began operating. Living conditions began to improve as the first residents moved into Boulder City in late 1931. Both times, when inspecting the tunnels after the spillways were used, engineers found major damage to the concrete linings and underlying rock. Lake Mead fell to a new record low elevation of 1,071.61 feet (326.63 m) on July 1, 2016 before beginning to rebound slowly. It was a huge effort involving thousands of workers. While suspended from the top of the canyon with ropes, the high-scalers climbed down the canyon walls and removed the loose rock with jackhammers and dynamite. [24] It also permitted the compact to go into effect when at least six of the seven states approved it. Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. After the war, it reopened September 2, 1945, and by 1953, annual attendance had risen to 448,081. [83] In these works, which are integrated into the walkways and interior halls of the dam, True also reflected on the machinery of the operation, making the symbolic patterns appear both ancient and modern. [130] Further, he suggested that if the dam were to be named after any one person, it should be for California Senator Hiram Johnson, a lead sponsor of the authorizing legislation. First the base, or invert, was poured. Complementing Kaufmann and True's work, sculptor Oskar J.W. Eventually renamed Hoover Dam in 1947, the dam was the largest manmade structure in the world when completed, and created Lake Mead, the largest reservoir in the United States. Frank Crow, was the Chief Engineer of Hoovered Dam and was assigned the job to get it completed in the span from 1931 - 1935. [32] A government camp was established for surveyors and other personnel near the dam site; this soon became surrounded by a squatters' camp. There is enough concrete in Hoover Dam to build a two lane highway from Seattle, Washington to Miami, Florida or a four foot wide sidewalk around the Earth at the equator. [109], Water flowing over the spillways falls dramatically into 600-foot-long (180 m), 50-foot-wide (15 m) spillway tunnels before connecting to the outer diversion tunnels, and reentering the main river channel below the dam. [118], 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. Power is generated in step with and only with the release of water in response to downstream water demands. [132] In 1947, a bill passed both Houses of Congress unanimously restoring the name "Hoover Dam. The massive construction that employed 21,000 men throughout the project took place during the Great Depression. They sent eleven organizers,[43] several of whom were arrested by Las Vegas police. [37], As part of the contract, Six Companies, Inc. was to build Boulder City to house the workers. [98] Due to the low water levels, by 2014 it was providing power only during periods of peak demand. Since about 1900, the Black Canyon and nearby Boulder Canyon had been investigated for their potential to support a dam that would control floods, provide irrigation water and produce hydroelectric power. [14] One potential site at Boulder Canyon was bisected by a geologic fault; two others were so narrow there was no space for a construction camp at the bottom of the canyon[14] or for a spillway. The committee drew up a list of demands that evening and presented them to Crowe the following morning. The gates cannot entirely prevent water from entering the spillways but can maintain an extra 16 ft (4.9 m) of lake level. [3] The average power generated was 4.2 TWh/year for 1947–2008. Falling objects were the most common cause of death on the dam site; the high scalers' work thus helped ensure worker safety. [6] The dam is located near Boulder City, Nevada, a municipality originally constructed for workers on the construction project, about 30 mi (48 km) southeast of Las Vegas, Nevada. Hoover Dam was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt. [70] To mark the occasion, a three-cent stamp was issued by the United States Post Office Department—bearing the name "Boulder Dam", the official name of the dam between 1933 and 1947. The Service investigated Black Canyon and found it ideal; a railway could be laid from the railhead in Las Vegas to the top of the dam site. [69], Most work had been completed by the dedication, and Six Companies negotiated with the government through late 1935 and early 1936 to settle all claims and arrange for the formal transfer of the dam to the Federal Government. It found that the work had been incompletely done, and was based on less than a full understanding of the canyon's geology. On Dec. 26, 1947, New York City woke up to a record-breaking snowstorm that dumped over 22 inches of snow in less than 24 hours. [42], The Industrial Workers of the World (IWW or "Wobblies"), though much-reduced from their heyday as militant labor organizers in the early years of the century, hoped to unionize the Six Companies workers by capitalizing on their discontent. [128] 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,[129] but was likewise ignored by Ickes. Its construction echoed that of the Hoover Dam during the Great Depression; like the dam, it became a concrete sign of resilience, rising against the odds of both nature and the economy with what Mr. Stillings calls “Mad Max-ian massiveness.” James Stillings. [109], The large spillway tunnels have only been used twice, for testing in 1941 and because of flooding in 1983. Read more. Officials eventually decided on a massive concrete arch-gravity dam, the design of which was overseen by the Bureau's chief design engineer John L. Savage. [127] Unknown to the general public, Attorney General Homer Cummings informed Ickes that Congress had indeed used the name "Hoover Dam" in five different bills appropriating money for construction of the dam. By September 1939, four more generators were operating, and the dam's power plant became the largest hydroelectricity facility in the world. [18] Initial talks produced no result, but when the Supreme Court handed down the Wyoming v. Colorado decision undermining the claims of the upstream states, they became anxious to reach an agreement. True's work on the Hoover Dam was humorously referred to in a poem published in The New Yorker, part of which read, "lose the spark, and justify the dream; but also worthy of remark will be the color scheme".[88]. The 1927 Mississippi flood made Midwestern and Southern congressmen and senators more sympathetic toward the dam project. Since the dam was an arch-gravity type, the side-walls of the canyon would bear the force of the impounded lake. The contractor had seven years to build the dam, or penalties would ensue. At the height of construction, a bucket arrived every 78 seconds. [108] Today, nearly a million people per year take the tours of the dam offered by the Bureau of Reclamation. Revisit what was called The Great Blizzard of 1947 in New York Daily News photographs. Originally known as Boulder Dam from 1933, it was officially renamed Hoover Dam for President Herbert Hoover by a joint resolution of Congress in 1947. For other uses, see. [40] The site of Hoover Dam endures extremely hot weather, and the summer of 1931 was especially torrid, with the daytime high averaging 119.9 °F (48.8 °C). The sidewalls were poured next. Two concrete plants were built on the project site for construction. Congress renamed the dam after President Herbert Hoover in 1947. [62], The first concrete was poured into the dam on June 6, 1933, 18 months ahead of schedule. The government was to provide the materials; but the contractor was to prepare the site and build the dam. In 1995, a new visitors' center was built, and the following year, visits exceeded one million for the first time. Construction of Hoover Dam . It cost a total of $165 million to build and was completed in four and a half years. One heroic high scaler saved his boss’s life during construction on the Hoover … Tierney, fell from one of the two Arizona-side intake towers. J. G. Tierney was assessing the canyon when he fell into the river …

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