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In page Pittsfield, Illinois:

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Pittsfield's drinking water supply is provided by Lake Pittsfield, an artificial reservoir held in by an earth and concrete dam. The 200-acre (0.81 km2) lake is located within a 680-acre (2.8 km2) park that has become a prime recreational area offering boating, fishing, RV and primitive camping, hiking, disc golf, and other outdoor activities.