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Winchester Lake State Park is a public recreation area covering 418 acres (169 ha) on the southern edge of Winchester in Lewis County, Idaho, United States. The state park surrounds 104-acre (42 ha) Winchester Lake at the base of the Craig Mountains. Fish in the lake include rainbow trout, perch, bass, and bluegill. Common wildlife includes white-tailed deer, Canada geese, muskrats, bald eagles, Columbian ground squirrels, and raccoons.