The Space Needle is an observation tower in Seattle, Washington, United States. Considered to be an icon of the city, it has been designated a Seattle landmark. Located at 400 Broad Street in the Lower Queen Anne neighborhood, it was built in the Seattle Center for the 1962 World's Fair, which drew more than 2.3 million visitors. At 605 ft (184 m) high, the Space Needle was once the tallest building west of the Mississippi River in the United States. The tower is 138 ft (42 m) wide, weighs 9,550 short tons (8,660 metric tons), and is built to withstand winds of up to 200 mph (320 km/h) and earthquakes of up to 9.0 magnitude, as strong as the 1700 Cascadia earthquake. Elevators take visitors to an observation deck 520 ft (160 m) above ground in 41 seconds, which offers panoramic views of the downtown Seattle skyline, the Olympic and Cascade Mountains, Mount Rainier, Mount Baker, Elliott Bay, and various islands in Puget Sound. On April 19, 1999, the city's Landmarks Preservation Board designated the tower a historic landmark.
Architecture
The architecture of the Space Needle is the result of a compromise between the designs of two people, Edward E. Carlson and John Graham, Jr. The two leading ideas for the World Fair involved businessman Edward E. Carlson's sketch (on a napkin) of a giant balloon tethered to the ground (the gently sloping base) and architect John Graham's concept of a flying saucer (that houses the restaurant and observation deck). Victor Steinbrueck introduced the hourglass profile of the tower and its tripod design, which resembles the isthmus that Seattle is situated on. The Space Needle was built to withstand Category 5-plus wind speeds of 200 mph (320 km/h), double the requirements in the building code of 1962, swaying only 1 inch (25 mm) per 10 miles per hour (16 km/h) of wind speed. While the 2001 6.8 Mw Nisqually earthquake jolted the Needle enough to cause water to slosh out of the toilets, the structure is designed to avoid serious structural damage in earthquakes of magnitudes below 9.1. For decades, the hovering disk of the Space Needle was home to two restaurants 500 ft (150 m) above the ground: the Space Needle Restaurant, which was originally named Eye of the Needle, and Emerald Suite. These were closed in 2000 to make way for SkyCity, a larger restaurant featuring Pacific Northwest cuisine, which closed in 2017. In 1993, the elevators were replaced with new computerized versions. The new elevators descend at a rate of 10 mph (16 km/h). On December 31, 1999, a powerful beam of light was unveiled for the first time. Known as the Legacy Light or Skybeam, it is powered by lamps that total 85 million candela shining skyward from the top of the Space Needle to honor national holidays and special occasions in Seattle. The concept of this beam was derived from the official 1962 World's Fair poster, which depicted such a light source (although none was incorporated into the building's original design). It is somewhat controversial because of the light pollution it creates. Originally planned to be turned on 75 nights per year, it has generally been used fewer than a dozen times per year. It did remain lit for eleven days in a row from September 11, 2001, to September 22, 2001, in response to the September 11, 2001, attacks. A 1962 Seattle World's Fair poster showed a grand spiral entryway leading to the elevator that was ultimately omitted from final building plans. The main stairwell has 848 steps from the basement to the top of the observation deck. At approximately 605 ft (184 m), the Space Needle was the tallest building west of the Mississippi River at the time it was built by Howard S. Wright Construction Co., but is now dwarfed by other structures along the Seattle skyline alone, among them the Columbia Center, at 967 ft (295 m). Unlike many other similar structures, such as the CN Tower in Toronto, the Space Needle is not used for broadcasting purposes.
History
Construction
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