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In page Gateway Arch:

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Near the top of the Arch, passengers exit the tram compartment and climb a slight grade to enter the observation area. This arched deck, which is over 65 feet (20 m) long and 7 feet (2.1 m) wide,[1] can hold up to about 160 people, equivalent to the number of people from four trams.[2] Sixteen windows per side, each measuring 7 by 27 inches (180 mm × 690 mm), offer views up to 30 miles (48 km)[3] to the east across the Mississippi River and southern Illinois with its prominent Mississippian culture mounds at Cahokia Mounds and to the west over the city of St. Louis and St. Louis County beyond.[citation needed]