Welcome to the Encyclopedia of Arkansas

This Day in Arkansas History

March 16, 1987

Mammoth Spring State Park opened the state’s tenth Arkansas Welcome Center, just off U.S. Hwy. 63 and within sight of Missouri. Mammoth Spring State Park preserves the state’s largest natural spring—and one of the largest in the world. Approximately nine million gallons of water flow through the spring hourly. The spectacular stream of cold water is the chief source of the Spring River, a fishing and canoeing stream that is popular year-round because of its dependable flow. The park also preserves a fully restored nineteenth-century railroad depot.

Browse the Encyclopedia

About the Encyclopedia

The CALS Encyclopedia of Arkansas is a free, authoritative source of information about the rich history, geography, and culture of Arkansas. It is updated regularly to ensure the people of Arkansas have an accurate and accessible resource to explore our heritage. We invite you to browse our text entries and media galleries to learn more about the people, places, events, legends, and lore of the 25th state. We are continually adding new entries, photographs, maps, videos, and audio files, so check back frequently to see what’s new.

New to Arkansas?
New to Arkansas?

Our overview page covers everything you would want to know about our beautiful state, including state symbols, demographics and more!

See Overview