Gateway Arch - St. Louis, Missouri
Posted by: Groundspeak Charter Member BruceS
N 38° 37.440 W 090° 11.101
15S E 745061 N 4278812
Quick Description: The Gateway Arch is the most well known landmark in the St. Louis, no visit to St. Louis would be complete without a trip to the top.
Location: Missouri, United States
Date Posted: 11/12/2007 3:33:04 PM
Waymark Code: WM2JPE
Published By: Groundspeak Premium Member saopaulo1
Views: 274

Long Description:

The process which led to the construction of the Arch began in 1933 when the St. Louis Mayor Dickman assembled a group of businessmen who formed the Jefferson National Expansion Memorial Association. A Joint Resolution from Congress followed in 1934. In 1935,the City passed a $7.5 million bond issue and, along with $9 million in WPA funds, began acquisition and clearance of a 40-block area. After this nothing significant happened until 1948 when architectural competition was won by Eero Saarinen.  Saarinen design was for a 630 foot tall stainless steel clad catenary curve shaped arch.  Construction of the Arch began in 1963, and was completed on October 28, 1965, for a total cost of less than $15 million. The Arch has foundations sunk 60 feet into the ground, and is built to withstand earthquakes and high winds; it sways up to 1 inch in a 20 mph wind, and is built to sway up to 18 inches.

General Facts

Outer Width - Outside North Leg to Outer South Leg 630' (192m)
Maximum Height 630' (192m)
Shape of Arch Section Equilateral Triangle
Dimension of Arch at Base 54 ft. (16.46m)
Dimension of Arch at Top 17 ft. (5.18m)
Size of Windows Approx. 7" x 27" (180 mm x 690 mm)
Construction of Windows 3/4 in. (19mm) Plate Glass; Hinged and Locked
Size of Observation Room 7' 2" x 65' x 6' 9" high (2.18m x 19.8m x 2.06m)
Capacity of Observation Platform 100 - 140 persons
Deflection of Arch 18" in 150 MPH wind (0.46 m in 240 km/h wind)
Method of Determining Deflection of Arch Calculations and Wind Tunnel Tests (240 km/h)
Number of Sections in Arch 142
Thickness of Plates for Outer Skin 1/4" (6.3mm)
Type of Material Used in Arch Exterior Stainless Steel; #3 Finish Type 304
Structural Capacity of Observation Area 100 lb/sq. ft (488 kg/m)


Type: Gateway

Subtype: Memorial

Location: Jefferson National Expansion Memorial

Visit Instructions:
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