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Naylors Run flows underground in Upper Darby from Sherbrook Boulevard to Walnut Park Drive, where it joins Cobbs Creek. Thousands of feet of Naylor's Run were channeled into underground culverts to facilitate commercial and residential development in the filled land above the pipes. Along its banks was the early-1900s Babies Hospital and the National Wood Preservers, which dumped hazardous material into the creek. Naylors Run joins Cobbs Creek near City Line Avenue.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
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