HOOVER DAM FAST FACTS AND FIGURES
Where is Hoover Dam?
In Black Canyon on the Colorado River, about 30 miles southeast ofLas Vegas, Nevada.
What were the excavation depths from the river's low-water surface to foundation rock?
In the upstream cut offtrench, it was 139 feet. The remaining excavation depths average 110 to 130 feet.
What are the geologic conditions at the dam site?
The foundation and abutments are rock of volcanic origin geologically called "andesite breccia." The rock is hard and
very durable.
What construction work was necessary before operations started at the dam site?
(I) Construction ofBoulder City to house both Government and contractor employees} .
(2) construction of7 miles of 22-foot wide, asphalt-surfaced highway from Boulder CIty to the dam SIte; .
(3) construction of22.7 miles ofstandard-gauge railroad from the Union Pacific main line in Las Vegas to Boulder CIty
and an additional 10 miles from Boulder City to the dam site;
(4) construction of a 222-mile-Iong power transmission line from San Bernardino, California, to the dam site to supply
energy for construction.
What were the principal divisions ofwork? .
More than 5,500,000 cubic yards ofmaterial were excavated, and another 1,000,000 CUbIC yards of earth and rock fill
placed. By feature, this included:
Excavation for the diversion tunnels, 1,500,000 cubic yards
For the foundation ofthe dam, power plant, and cofferdams 1,760,000 cubic yards;
For the spillways and inclined tunnels, 750,000 cubic yards
For the valve houses and intake towers, 410,000 cubic yards
Earth and rock fill for the cofferdams, 1,000,000 cubic yards.
In addition, 410,000 linear feet of grout and drainage holes were drilled, and 422,000 cubic feet of grout were placed
under pressure.
When did construction begin?
Construction on Hoover Dam began September 30, 1930.
What were the quantities of principal materials used in the dam?
The principal materials, all ofwhich were purchased by the government, were:
Reinforcement steel, 45,000,000 pounds
Gates and valves, 21,670,000 pounds
Plate steel and outlet pipes, 88,000,000 pounds
Pipe and fittings, 6,700,000 pounds or 840 miles
Structural steel, 18,000,000 pounds
Miscellaneous metal work, 5,300,000 pounds.
How much steel and metal work was used to build the dam?
There are 96,000,000 Ibs of steel and metalwork used by the dam - but none of it in the dam.
What type of dam is Hoover?
Hoover Dam is a concrete arch-gravity type, in which the water load is carried by both gravity action and horizontal arch action.
https://u3asites.org.uk/files/c/cowbridge/docs/hooverdamtextocr8feb2017.pdf
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