Gateway Arch National Park

Gateway Arch National Park occupies 91 acres on the west bank of the Mississippi River in downtown St. Louis, Missouri, making it one of the smallest national parks in the country. The park's centerpiece is the Gateway Arch — a 630-foot stainless-steel catenary curve completed in 1965 and the tallest man-made monument in the United States. The park also includes the Museum of Westward Expansion underground beneath the arch and the Old Courthouse two blocks west, where the Dred Scott freedom suits were tried in 1847 and 1850. The site drew about 2.2 million visitors in 2023, ranking 16th among the 63 national parks, and is the most-visited park in the Midwest.

The Gateway Arch tram ride, which carries visitors 630 feet to the top in small egg-shaped pods and delivers views of St. Louis and the Mississippi River stretching up to 30 miles on a clear day.
The Museum of Westward Expansion, a free underground museum beneath the arch tracing the Louisiana Purchase, the Lewis and Clark Expedition, and the lives of Indigenous peoples and settlers during the 19th-century westward migration.
The Old Courthouse, where enslaved people Dred and Harriet Scott filed suit for their freedom in 1847, launching the legal case that reached the U.S. Supreme Court in 1857 and accelerated the national crisis over slavery.
The arch's design by Finnish-American architect Eero Saarinen, who won the Jefferson National Expansion Memorial competition in 1948 with a shape — the weighted catenary curve — that has no exact precedent in monumental architecture.

By car: Gateway Arch National Park sits on the St. Louis riverfront at the east end of Market Street in downtown St. Louis. Interstate 44, I-55, and I-64 all feed into downtown; follow signs for the riverfront or Arch. Parking is not available inside the park; the nearest garages are the Gateway Arch Parking facilities on Memorial Drive and several private lots within 3 blocks. Expect to pay $15–$25 for the day. Avoid driving to the riverfront on Cardinals game days — traffic and parking costs spike significantly.

By MetroLink (light rail): The Arch–Laclede's Landing station on the MetroLink Red and Blue lines is a short walk from the park's north entrance. MetroLink runs from St. Louis Lambert International Airport (STL) to downtown in about 30 minutes, making it the most convenient airport-to-park option. A single-ride ticket costs about $2.50.

By air: St. Louis Lambert International Airport (STL) is approximately 15 miles northwest of the park. The MetroLink light rail connects the airport directly to downtown St. Louis without a transfer; the ride to the Arch–Laclede's Landing station takes approximately 30 minutes. Major domestic carriers serve STL; no international nonstop routes operate regularly.

The Gateway Arch stands on alluvial bottomland — flat, river-deposited sediment built up over thousands of years along the west bank of the Mississippi River. The Mississippi at St. Louis carries sediment from as far north as Minnesota and as far west as Montana; the cobblestone levee visible below the riverfront promenade was laid to manage bank erosion from this constant sediment flow and periodic flooding. Before the riverfront was developed in the 19th century, spring floods regularly covered the ground where the park now sits.

The limestone and dolomite bedrock beneath the city formed from ancient shallow seas that covered the Midwest roughly 350 to 450 million years ago during the Silurian and Devonian periods. St. Louis sits above the Ozark Plateau, a broad dome of these ancient marine sediments that erosion has carved into the rolling hills visible south and west of the city. The Mississippi River follows one of several ancient drainage paths cut through this limestone landscape during the Pleistocene, when meltwater from retreating glaciers carved the major river valleys of the central United States.

Peregrine falcons nest on the Gateway Arch, using the upper ledges of the monument's legs as a cliff-substitute in the urban landscape. The arch is one of several St. Louis structures where peregrine pairs have returned since the species recovered from near-extinction following the DDT era. Chicks fledge in summer; rangers and volunteers sometimes monitor nest activity from the grounds below.

The Mississippi River corridor running through the park supports migrating waterfowl and shorebirds in spring and fall, including ducks, geese, and herons visible from the riverfront promenade. Bald eagles winter along the Mississippi near St. Louis, occasionally perching on river structures visible from the park. The reflecting ponds attract migrating songbirds during spring and fall migration periods.

Common urban wildlife on the grounds includes red foxes, raccoons, and a variety of songbirds. The park's trees and ponds create a small but functional urban green space that supports more biodiversity than the surrounding streetscape.

The land where the park sits was part of the territory acquired in the Louisiana Purchase of 1803, when President Thomas Jefferson doubled the size of the United States by buying approximately 828,000 square miles from France for $15 million. St. Louis, already a French and Spanish trading post, became the staging point for western expansion almost immediately. In May 1804, the Corps of Discovery led by Meriwether Lewis and William Clark departed from the St. Louis area and traveled up the Missouri River toward the Pacific — a journey that mapped the new territory and opened it to American settlement.

The Old Courthouse at the park's western end was the site of two trials in the Dred Scott freedom suit. In 1847, Dred Scott and his wife Harriet sued for their freedom in the St. Louis Circuit Court, arguing that years of residence in free territory had made them legally free. The case was tried again in 1850 and decided in their favor, then overturned on appeal. The case reached the U.S. Supreme Court as Dred Scott v. Sandford in 1857; the Court's ruling — that Black Americans had no standing to sue in federal court and that Congress had no power to prohibit slavery in the territories — accelerated the sectional crisis leading to the Civil War.

In 1933, the federal government cleared 40 city blocks along the St. Louis riverfront to create a memorial to westward expansion. Finnish-American architect Eero Saarinen won the design competition in 1948 with a proposal for a 630-foot stainless-steel arch in the shape of a weighted catenary curve. Construction began in 1963, and the arch was completed on October 28, 1965, when the two legs were joined at the top. The Jefferson National Expansion Memorial was formally opened to the public in 1967 and redesignated Gateway Arch National Park by Congress on February 22, 2018.