Editing Mammoth Spring (section)

==Description==
Precipitation that falls in southern [[Missouri]] seeps into the [[water table]] and flows through a vast system of passages and cavities. These cavities form an underground river that ultimately emerges on the surface at the town of Mammoth Spring, Arkansas. The emerging water forms a 10-acre spring pool that drains over a high stone dam. The spring generates a harmonic mean flow of about 9 m³/s (322 cubic feet per second). The water emerges at a constant 14&nbsp;°C (58&nbsp;°F). The spring itself cannot be viewed at the Mammoth Spring site because its mouth is more than 21&nbsp;m (70&nbsp;ft) below the surface of the large spring pool.

Nine miles northwest of Mammoth Spring, visitors can see a portion of the underground river that feeds the spring at a collapsed [[cave]] in [[Grand Gulf State Park (Missouri)|Grand Gulf State Park]] in Missouri. The remains of a portion of the cave are now a 40&nbsp;m (130&nbsp;ft) deep chasm with a natural bridge over it. Dye tests have proven that the water flowing through the 40&nbsp;m (130&nbsp;ft) chasm at Grand Gulf exits through the existing cave and emerges at Mammoth Spring.

[[Image:Mammoth spring (47).JPG|thumb|Mammoth Spring as viewed from the south looking north.]]