Big Springs state park in Van Buren Missouri.

At an average daily flow of 286 million gallons of water, Big Spring is an awesome sight and a geologic wonder. Underground passages carry water from as far as 45 miles away to emerge at the spring. Studies have shown that the water is carrying a load of dissolved limestone equivalent to 70 tons a day! This dissolved rock gives the spring its color and is also carving out a huge conduit underground. Should the spring ever go dry, a huge cave will be the result.