Photos of Great Falls of the Potomac
About Great Falls of the Potomac
Roughly 35,000 years ago, the Potomac River began carving out the Great Falls of the Potomac. The river cascades over a series of 20-foot falls, falling a total of 76 feet in elevation over a distance of less than 1 mile. The Potomac narrows significantly as it passes over the falls and through Mather Gorge. Heavy rain or snow in the watershed upstream causes white-water floods which entirely submerge the rocks and even threaten the adjacent park visitor center (built on stilts for this reason). -from Wikipedia
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