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The 330-acre state park is oriented around a manmade lake formed by a 170-foot-long dam across Spring Creek. The lake was first formed in 1857 when a dam and gristmill were constructed by William Breed. The mill and the dam were demolished in 1916. The site was later acquired by the state for a park and was opened to the public in 1938. Just before that time, in 1936–1937, the Civilian Conservation Corps had built a new dam and spillway, re-creating the lake. The sloping 40foot-high spillway was constructed of blocks of multicolored stones.