[4] Precipitation that falls in southern Missouri seeps into the water table and flows through a vast system of passages and cavities.

Dye tests have proven that the water flowing through the 40 m (130 ft) chasm at Grand Gulf exits through the existing cave and emerges at Mammoth Spring.

Prior to 1972, the Mammoth Spring Cattle Sales Barn was co-owned and run by local entrepreneur Bert Kenneth Bishop and his associate, roughly on the site of where the Welcome Center now stands.

Local farmers would routinely come to the site to sell livestock and other wares, such as Howard Green, who sold home-made walking sticks.

The original Frisco Depot was restored in 1971 and now functions as a repository for artifacts and memorabilia related to the railroad and the spring area.

The State Park provides a visitor's center, picnic areas, walking trails, and tour access to the dam and hydro plant.