Monocacy River

For other streams named Monocacy, see Monocacy (disambiguation).

Monocacy River
The Monocacy River near Frederick in 2007
Country	United States
State	Maryland
Tributaries
- left	Piney Creek, Double Pipe Creek, Israel Creek, Linganore Creek, Furnace Branch
- right	Toms Creek, Tuscarora Creek, Carroll Creek, Ballenger Creek
City	Frederick
Source
- location	Harney, Carroll County, Maryland, USA
- elevation	400 ft (122 m)
- coordinates
Mouth	Potomac River
- location	Dickerson, Maryland, USA
- elevation	200 ft (61 m)
- coordinates
Length	58 mi (93 km)
Basin	744 sq mi (1,927 km2)
Discharge	for Frederick
- average	1,550 cu ft/s (44 m3/s)
- max	3,060 cu ft/s (87 m3/s)
- min	573 cu ft/s (16 m3/s)
Discharge elsewhere (average)
- Bridgeport, Frederick County, Maryland	400 cu ft/s (11 m3/s)
The Monocacy River watershed

The Monocacy River is a free-flowing left tributary to the Potomac River, which empties into the Atlantic Ocean via the Chesapeake Bay. The river is 58.5 miles (94.1 km) long, with a drainage area of about 744 square miles (1,930 km²). It is the largest Maryland tributary to the Potomac.

The name "Monocacy" comes from the Shawnee name for the river, Monnockkesey, which translates to "river with many bends." (However, another local tradition asserts that "Monocacy" means "well-fenced garden" in an Indian language.) The first town ever settled in Western Maryland, Monocacy, also gets its name from this river.

The Monocacy National Battlefield lies alongside part of the river, marking an 1864 engagement during the American Civil War, the Battle of Monocacy Junction. The Chesapeake and Ohio Canal crosses over the river at the Monocacy Aqueduct, the largest of the 11 aqueducts on the canal.

Geography

The river rises in Carroll County, Maryland, west of the unincorporated town of Harney, at the Maryland-Pennsylvania border. The river is formed by the confluence of Marsh Creek and Rock Creek, which flow out of Adams County, Pennsylvania. Maryland tributaries include Furnace Branch, Tuscarora Creek, Carroll Creek, Linganore Creek and Ballenger Creek in Frederick County and Double Pipe Creek in Carroll County; other Pennsylvania tributaries include Alloway Creek and Toms Creek in Adams County.

About 60% of the Monocacy watershed is dedicated to agricultural use; about 33% of the watershed is forested. The city of Frederick and its suburbs form the largest urban area within the watershed.

Pollution

The State of Maryland designated the Monocacy as a Maryland Scenic River in 1974. However, it has one of the greatest nonpoint source pollution problems in the state due in large part to runoff from the 3,500 farms, livestock operations and dairies in the watershed. The Maryland Department of the Environment (MDE) has listed the Monocacy with impaired water quality for sediment and fecal coliform bacteria. A major tributary basin, the Double Pipe Creek watershed, is also impaired for sediment and bacteria.

Some farmers in the Monocacy watershed participate in the national Conservation Security Program operated by the U.S. Department of Agriculture (USDA), designed to help stem pollution due to erosion and pollutant runoff from farming. In the 1990s the watershed was part of a national water quality demonstration project sponsored by USDA, which helped farmers reduce fertilizer usage and reduced discharges of nitrogen and phosphorus to the river.

See also

• List of Maryland rivers
• List of rivers of Pennsylvania

External links

• Monocacy Scenic River Water Trail Map & Guide - Maryland DNR
• Monocacy River factsheet - Alliance for the Chesapeake Bay
• Monocacy Watershed profile – US EPA
• Monocacy & Catoctin Watershed Alliance
• Monocacy Aqueduct – C&O Canal Virtual Tour
• Monocacy Basin Stream Monitoring Project
• Monocacy Battlefield – National Park Service
• Fishing the Monocacy River
• Kayaking/Canoeing the Monocacy
• Monocacy Scenic River Citizen's Advisory Board