McCarthy Completes $380M Expansion of Gateway Arch Museum in St. Louis

Visitors can now access the Arch at a street-level entrance.

ST. LOUIS — McCarthy Building Cos. Inc. has completed a 47,000-square-foot subterranean expansion and renovation of the Museum of the Gateway Arch. This is the final component of a $380 million redevelopment of the monument in downtown St. Louis. McCarthy also oversaw the transformation of the north and south grounds surrounding the Arch. The renovated museum and visitor’s center opened to the public on Tuesday, July 3. A new circular entrance and upper-level lobby replaces the previous underground entrances at the base of each leg of the Arch. The landmark remained open and fully operational throughout the three-year construction project. Cooper Robertson, James Carpenter Associates and Trivers Associates designed the museum expansion. Michael Van Valkenburgh Associates oversaw the landscape design. Gateway Arch Park Foundation and the National Park Service led the Gateway Arch Park redevelopment projects. Built as a monument to the westward expansion of the United States, the 630-foot Arch was completed in 1965.

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