In the mid-19th century, settlers found Bennett Spring to be an ideal spot for grist and flour mills. Today, most people come to Bennett Spring State Park to struggle with the rainbow trout, or just to marvel at the 100,000,000 gallons of clear, cool water that gush from the spring each day.
The spring valley - once a popular camping ground for farmers waiting for their grain to be ground at the mill - still attracts visitors interested in camping, hiking, fishing, canoing and SCUBA diving. Bennett Spring State Park is a well known trout hatchery.
The cavern can be found in the center of the springhead and decends to 84 feet underwater. There is a restriction that is only a few feet tall and allows spring water to flow into the cavern. Once past the restriction there is a room that has been dubbed the "Popcorn Room." Inside the Popcorn Room the gravel bottom percolates due to the flow of the water entering from the aquifer resembling popcorn.