En janvier 1936, le Grand Coulee Bridge (un pont permanent autoroutier) fut ouvert après de nombreux retards liés aux crues ; Trois ponts supplémentaires et temporaires furent construits en aval pour déplacer les ouvriers et les véhicules ainsi que le sable et le gravier nécessaire à la fabrication de béton[23],[38]. La centrale de pompage-turbinage contient six unités de pompage-turbinage d'une capacité de 314 MW. En 1933, le Bureau of Reclamation commença à acheter des terres jusqu'à 243 km en amont du barrage pour implanter le futur réservoir. Sixteen million pounds of steel were shipped in from the Midwest and South, the mills transporting the steel in semi-circular rolls so it could fit through rail yards and tunnels along the way. Generators G-19, G-20 and G-21 in the Third Power Plant have a 600 MW installed capacity but can operate at a maximum capacity of 690 MW which brings the overall maximum capacity of the dam's power facilities to 7,079 MW. Hall était l'inspecteur en chef et Orin G. Patch était le responsable du béton[14],[49],[50]. [23] President Franklin D. Roosevelt, who took office in March 1933, supported the dam because of its irrigation potential and the power it would provide, but he was uneasy with its $450 million price tag. Un mois plus tard, la zone fut inondée[79]. Hall was the chief inspector who would accept the dam from the contractors. All facilities had to be purchased or relocated, and 3,000 residents were relocated. Roosevelt launched Federal program after Federal program in an attempt to spur the economy by “priming the pump” and providing jobs for out-of-work Americans. Together, they became known as the "Dam College". The turbines, built by Newport News Ship Building and Dry Dock Company, also were a record size. Le théâtre est situé au-dessus de la zone des expositions et est accessible aux personnes handicapées. [30] Opposite Engineer's Town, MWAK constructed Mason City in 1934. Le personnel est très sympa et la vue magnifique sur la place du Dam et le Grand Coulee sont incroyables. “Power that sings, boys, turbines that whine. [70] Beginning in July 1967, this involved demolishing the northeast side of the dam and building a new fore-bay section. [81] This means the dam generates about 2,397 MW of power on average, which results in a total plant factor efficiency of 35%. Tours of the dam were set to begin April 1, 2020, but will be delayed until further notice. En mars 1938, MWAK termina la construction du barrage bas et Consolidated Builders Inc. entama celle du barrage haut. Full view. Proponents of this latter “gravity plan” argued that the hydroelectricity generated from the dam was not needed. Les géologues pensaient initialement que la Grand Coulee avait été formé par un glacier mais la théorie selon laquelle elle avait été creusée par de fortes inondations issues du lac glaciaire Missoula s'imposa à partir du milieu du XXe siècle[3]. If built, the Kettle Falls Dam would have lain in the path of the Grand Coulee Dam's reservoir, essentially blocking its construction. Le barrage Grand Coulee (en anglais : Grand Coulee Dam) est un barrage hydroélectrique de type poids sur la rivière Columbia, dans l' État de Washington, aux États-Unis destiné à produire de l'électricité et à permettre l'irrigation. Les creuseurs engagèrent alors le général George Washington Goethals, ingénieur du Canal de Panama pour préparer un rapport. Third Powerplant: Au cours de la construction, le béton grossier était acheminé sur le site par wagons avant d'être traité par huit grandes bétonnières. Les batardeaux permettaient aux ouvriers d'assécher des portions du lit de la rivière pour commencer la construction du barrage tout en permettant à l'eau de continuer de couler au centre du fleuve[27]. The reservoir is called Franklin Delano Roosevelt Lake, named after the United States President who presided over the dam's authorization and completion. more. From the town of Odair, rails extended to the construction site, where MWAK used an innovative conveyor belt, rather than trucks, to carry the tons of rock and earth excavated each day. The "pumpers" favored a dam with pumps to elevate water from the river into the Grand Coulee from which canals and pipes could irrigate farmland.

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