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Mill Creek drains a 30.9-square-mile subwatershed of the Des Plaines River Watershed in north central Lake County. Mill Creek flows north to its confluence with North Mill Creek. It then flows east to the Des Plaines River in Wadsworth. The channelized stream south of Third Lake is known as the Avon-Fremont Drainage Ditch. Several large lakes are in the Mill Creek subwatershed, including Sand, Miltmore, Fourth, Gages, Druce, Third, and Grays.