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Interstate Commission on the Potomac River Basin. The Potomac basin stretches across parts of four states (Maryland, Pennsylvania, Virginia and West Virginia) as well as the District of Columbia. This area is also called the Potomac watershed.
The Great Falls of the Potomac is 3 miles downstream from here, to the southeast. Little Falls is 11 miles downstream and the estuary, at sea level, begins 13 miles downstream. The distance to the mouth of the Potomac is 130 miles.The river's overall length, from source to mouth, is 382 miles. Its average width from Harpers Ferry to Washington is 1,500 feet, except at Great Falls where it narrows to a 200-foot gorge.uman habitation in the Potomac River Basin has existed for 9,000 years, according to archeological evidence. The name Potomac derives from the Algonquian word patawomeke, which means trading place.. The first English settlement, St. Mary's City, was founded in 1634.