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alley spring

Alley Spring, the natural area’s namesake, is the seventh largest spring in Missouri. The spring conduit is known to extend at least 3000 feet underground and reaches at least 155 feet below the surface. Rainfall and runoff entering sinkholes around the town of Summersville, 15 miles to the northwest, has been determined to enter the labyrinth of cave passageways formed in dissolved dolomite ( a type of limestone) under the Missouri Ozarks and exit at Alley Spring. Just outside of the natural area is Alley Spring gristmill that was built in 1894. Despite the historic use of the spring to power a mill, Alley Spring has retained its biological integrity. The cool waters issuing forth from Alley Spring flow through a spring branch for a half-mile before entering the Jacks Fork River. Here in the spring branch cool water (58 degrees Fahrenheit) provides habitat for colorful Ozark fishes including the southern redbelly dace, the Ozark sculpin, and the bleeding shiner. The spring discharges 81 million gallons of water a day. THAT IS 81 MILLION!!!

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Uploaded on November 27, 2017
Taken on November 23, 2017