Hershey Run is a 2.9 miles (4.7 km) stream located in New Castle County, Delaware

New Castle County, Delaware

New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of 2010 its population was 538,479, an increase of 7.6% over the previous decade. The county seat is Wilmington. The center of population of Delaware is located in New Castle County, in the town of...

. It is a tributary of White Clay Creek

White Clay Creek

White Clay Creek is an tributary of the Christina River in southern Pennsylvania and northern Delaware in the United States. It is renowned for its scenic character and is largely federally protected....

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It rises on the edge of the Belvedere subdivision on the outskirts of Newport, Delaware

Newport, Delaware

Newport is a town in New Castle County, Delaware, United States. It is located on the Christina River. It is best known for being the home of colonial inventor Oliver Evans. The population was 1,055 at the 2010 census...

 and flows southward along the western edge of that town. To the west of the run lies Bread and Cheese Island, cut off by a partly filled back channel between Hershey Run and Red Clay Creek

Red Clay Creek

Red Clay Creek is a tributary of White Clay Creek in southeastern Pennsylvania and northern Delaware in the United States.The East and West branches both rise in West Marlborough Township, Pennsylvania, near the hamlet of Upland, and flow south through Kennett Square before uniting just north of...

. New Castle County's Pleasant Hills Park lies along the run in the vicinity of the junction with the back channel. At the southern end of the park, the run enters a tidal marsh which extends to its mouth, near the end of the White Clay.

The nearby Koppers railroad tie

Railroad tie

A railroad tie/railway tie , or railway sleeper is a rectangular item used to support the rails in railroad tracks...

treatment plant heavily contaminated the run with creosote.