WASHINGTON — Mammoth Spring pumps out nine million gallons of water an hour. A dam built in 1887 created a small lake and provided power for a flour mill, cotton mill, and cotton gin. In 1925 the Arkansas-Missouri Power Company bought the rights to the dam and built a hydroelectric plant that was in use until 1972.
The park, established in 1957, includes an Arkansas Welcome center, a short trail with interpretive signs that circles the lake, exhibits in the remains of the hydroelectric plant, and a museum in the beautifully restored 1886 train depot.
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