When was the hoover dam built ?
The 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. Originally it was named Boulder Dam by the Roosevelt administration until 1947 when it was changed in honor of president Herbert Hoover, who passed away during its construction. Construction began in 1931 and ended in 1936. This was during the Great Depression, and the project was an effort to help control flooding of Colorado river, create jobs, generate cheap electricity to supply power to homes and industry, and also store water for the expanding population of the west. Unfortunately during the construction over a hundred lives were lost. The dam is owned by the United States Government, and operated by The United States Bureau of Reclamation. The first concert was poured into the dam on June 6, 1933, 18 months ahead of schedule. This posed a serious problem since concrete heats and contracts as it cures, so it had the potential to for uneven cooling. Instead of a singe continuous pour, which would take too long to cool and result ing stresses that would cause the dam to crack and crumble, the ground were the ground would rise was marked with rectangles and concrete blocks in columns were poured some as large as 50 sq ft by 5 feet. Each of these would contain a set of 1 inch steel pipes. Cool and ice cold water would be poured through the pipes to help it cool. One intersecting fact is the concrete is still curing, harder and harder every year even in 2017 some 82 years after the construction of Hoover Dam was completed in 1935.Apr 4, 2017.
