103 miles (166 km) downstream from its source, the North Branch is joined by the South Branch between Green Spring and South Branch Depot, West Virginia from whence it flows past Hancock, Maryland and turns southeast once more on its way toward Washington, D.C., and the Chesapeake Bay. At Cumberland, the river turns southeast. First, it flows northeast by the communities of Bloomington, Luke, and Westernport in Maryland and then on by Keyser, West Virginia to Cumberland, Maryland.
Below the dam, the North Branch cuts a serpentine path through the eastern Allegheny Mountains. From the Fairfax Stone, the North Branch Potomac River flows 27 miles (43 km) to the man-made Jennings Randolph Lake, an impoundment designed for flood control and emergency water supply. The source of the North Branch Potomac River is at the Fairfax Stone located at the junction of Grant, Tucker and Preston counties in West Virginia. The North Branch between Cumberland, Maryland, and Ridgeley, West Virginia, in 2007 The estuary also widens, reaching 11 statute miles (17 km) wide at its mouth, between Point Lookout, Maryland, and Smith Point, Virginia, before flowing into the Chesapeake Bay. Salinity in the Potomac River Estuary increases thereafter with distance downstream. Once the Potomac drops from the Piedmont to the Coastal Plain at the Atlantic Seaboard fall line at Little Falls, tides further influence the river as it passes through Washington, D.C. As it flows from its headwaters down to the Chesapeake Bay, the Potomac traverses five geological provinces: the Appalachian Plateau, the Ridge and Valley, the Blue Ridge, the Piedmont Plateau, and the Atlantic coastal plain. The river's two branches converge just east of Green Spring in Hampshire County, West Virginia, to form the Potomac. The source of the South Branch is located near Hightown in northern Highland County, Virginia.
The source of the North Branch is at the Fairfax Stone located at the junction of Grant, Tucker, and Preston counties in West Virginia. Map showing the five geological provinces through which the Potomac River flows
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. on the left descending bank and between West Virginia and Virginia on the right descending bank. The river forms part of the borders between Maryland and Washington, D.C. Over 5 million people live within its watershed.
It is 405 miles (652 km) long, with a drainage area of 14,700 square miles (38,000 km 2), and is the fourth-largest river along the East Coast of the United States and the 21st-largest in the United States. The Potomac River ( / p ə ˈ t oʊ m ə k/ ( listen)) drains the Mid-Atlantic United States, flowing from the Potomac Highlands into Chesapeake Bay. Note: Since 1996, the Potomac has been the 'sister river' of the Ara River of Tokyo, Japan (non-tidal water years: 1931–2018) Ĭonococheague Creek, Antietam Creek, Monocacy River, Rock Creek, Anacostia RiverĬacapon River, Shenandoah River, Goose Creek, Occoquan River, Wicomico River
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