Little Falls, near Washington, D.C. (non-tidal; water years: 1931–2018)[2]
• average
11,498 cu ft/s (325.6 m3/s) (1931–2018)
• minimum
4,017 cu ft/s (113.7 m3/s) (2002)
• maximum
484,000 cu ft/s (13,700 m3/s) (1936)
Discharge
• location
Point of Rocks, Maryland
• average
9,504 cu ft/s (269.1 m3/s)
Discharge
• location
Hancock, Maryland
• average
4,168 cu ft/s (118.0 m3/s)
Discharge
• location
Paw Paw, West Virginia
• average
3,376 cu ft/s (95.6 m3/s)
Basin features
Tributaries
• left
Conococheague Creek, Antietam Creek, Monocacy River, Rock Creek, Anacostia River
• right
Cacapon River, Shenandoah River, Goose Creek, Occoquan River, Wicomico River
Waterfalls
Great Falls, Little Falls
------------------------------------------------------------------ Note: Since 1996, the Potomac has been the 'sister river' of the Ara River of Tokyo, Japan[3]
The Potomac River (/pəˈtoʊmək/ⓘ) is a major river in the Mid-Atlantic region of the United States that flows from the Potomac Highlands in West Virginia to the Chesapeake Bay in Maryland. It is 405 miles (652 km) long,[4] with a drainage area of 14,700 square miles (38,000 km2),[5] and is the fourth-largest river along the East Coast of the United States and the 21st-largest in the United States. More than 5 million people live within its watershed.
The river forms part of the borders between Maryland and Washington, D.C., on the left descending bank, and West Virginia and Virginia on the right descending bank. Except for a small portion of its headwaters in West Virginia, the North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters, which lie in Virginia.
^"President Clinton: Celebrating America's Rivers". American Heritage Rivers. July 30, 1998. Archived from the original on April 28, 2014. Retrieved February 5, 2014.
^"USGS 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA". nwis.waterdata.usgs.gov. National Weather Service (NOAA). 2019. Archived from the original on October 28, 2020. Retrieved March 23, 2019.
^"(Arakawa - Potomac sister rivers)". Interstate Commission on the Potomac River Basin. January 27, 2012. Archived from the original on December 27, 2013. Retrieved September 23, 2016.
^U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived March 29, 2012, at the Wayback Machine. Retrieved August 15, 2011
^"Facts & FAQs". Interstate Commission on the Potomac River Basin (ICPRB), Rockville, MD. September 16, 2009. Archived from the original on January 15, 2010. Retrieved February 5, 2010.
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Global Information
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