Gateway Arch National Park contains only 91 acres, which makes it the smallest national park in the United States. Although the park is known for the towering, futuristic Gateway Arch structure itself, our staff also manage the surrounding grass, trees, shrubs, and flowers that make the park an urban oasis for St. Louis residents and tourists alike.

From an ecological perspective, the lands within the park’s boundaries are highly unnatural. The landscaping design consists mostly of groupings of monocultures. Air, water, light, and noise pollution are all present. These factors, combined with the large number of visitors, requires intensive and specialized grounds management by a dedicated crew of professionals.
The stainless steel arch, shaped like an upside down U, with various trees and shrubs


What plants are here? Why were they chosen? How are they maintained?

An opossum stands on a steel post. It has a white furry face with a pointy nose and small beady eyes


Learn about the surprising diversity of urban-adapted wildlife that can be found here

A leg of the Gateway Arch emerges from some trees to left of railroad tracks river and two bridges.

Environmental Factors

Our park's location between the Mississippi River and downtown St. Louis brings challenges and opportunities

Last updated: November 30, 2021

Park footer

Contact Info

Mailing Address:

11 North 4th Street
St. Louis, MO 63102


314 655-1600

Contact Us