Antietam Creek

Antietam Creek is a 41.7-mile-long (67.1 km)tributary of the Potomac River located in south central Pennsylvania and western Maryland in the United States, a region known as the Hagerstown Valley. The creek became famous as a focal point of the Battle of Antietam during the American Civil War.

The creek is formed in Franklin County, Pennsylvania, at the confluence of the West and East Branches of Antietam Creek, about 2.3 miles (3.7 km) south of Waynesboro, Pennsylvania. Welty's Mill Bridge crosses the East Branch of Little Antietam at Washington Township in Franklin County, Pennsylvania. The stream runs for about 0.5 miles (0.80 km) upon its entering Washington County, Maryland. The course proceeds southward in a meandering pattern, and the creek empties into the Potomac south of Sharpsburg about 50 miles (80 km) upstream of Washington.

The watershed area is 290 square miles (750 km²) and includes parts of Franklin County (106 mi²) and Washington County (185 mi²). Major tributaries in Pennsylvania include the East and West Branches, Red Run and Falls Creek. Major tributaries in Maryland include Little Antietam Creek, Beaver Creek, and Marsh Run. Communities in the watershed include Waynesboro in Pennsylvania; and Boonsboro, Funkstown, Hagerstown, Mount Aetna, Sharpsburg and Smithsburg in Maryland.

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