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1977
Potato Creek carries exactly one dam of record, and it is not in the town. In 1977 the state dammed the creek on township ground east of North Liberty to make Worster Lake, the 327-acre centre of the new Potato Creek Recreation Area, dedicated by Governor Otis R. Bowen on 6 June 1977 and named for Darcy Worster, the naturalist who had lobbied for the reservoir for decades. The dam turned the mill stream's lower valley into the town's swimming, fishing, and boating water — the parks leg carries the park whole. No second dam on the creek is carried by any source reached; the historical mill dam at the townsite is attested only by its millpond, and its structure, builder, and removal are stated by no carrier, a named gap whose settlers are the county histories read for the mills and the Sanborn maps.