Patapsco River

river in Maryland, United States
Coordinates: 39°10′25″N 76°26′36″W / 39.1737202°N 76.4432935°W / 39.1737202; -76.4432935

The Patapsco River is a river in the state of Maryland in the United States. It is 39 miles (63 km) long.[1] The name "Patapsco" comes from the language of the Algonquian tribe of Native Americans. The Alginquian word pota-psk-ut means "backwater" or "tide covered with froth."[2]

Patapsco River
Patapsco fg01.jpg
Patapsco Valley State Park at Catonsville.
Country United States
State Maryland
 - left North Branch
 - right South Branch
Cities Baltimore, Elkridge, Ellicott City
 - location Marriottsville
 - elevation 260 ft (79 m)
 - coordinates 39°20′59″N 76°52′56″W / 39.3498272°N 76.8821987°W / 39.3498272; -76.8821987
Mouth Chesapeake Bay
 - location Baltimore
 - elevation ft (0 m)
 - coordinates 39°10′25″N 76°26′36″W / 39.1737202°N 76.4432935°W / 39.1737202; -76.4432935
Basin 632 sq mi (1,637 km²)
Patapsco River Watershed
Patapsco River Watershed

The river runs through central Maryland and empties into the Chesapeake Bay. The mouth of the river, where it enters the Chesapeake Bay, serves as the city of Baltimore's Inner Harbor. The river has two tributaries. The North Branch runs north. The South Branch runs east and is the northern border of Howard County, Maryland.

Related pagesEdit


  1. U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
  2. "Ghosts of industrial heyday still haunt Baltimore's harbor, creeks". Chesapeake Bay Journal. Archived from the original on 2018-10-01. Retrieved 2012-09-08.