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THE RIVER CAN KILL — STAY OUT. That blunt warning greets visitors at Great Falls Park because subtlety hasn't deterred people from illegally wading, swimming and diving into this treacherous slice of the Potomac.
Since 2001, 27 people have died in river accidents in the area, including three since June. Few wore life jackets.
The death toll is low in the raging falls, because the danger is obvious and few people venture there. More often, the river's victims are people who came to hike, fish or swim and who disappeared after entering tame-looking water downstream.
The geology is complex, but in a nutshell, 200 million years of the river's flow barely eroded some of the bedrock. Waves of sediment from melting glaciers in western Pennsylvania exposed the same kinds of jagged cracks, outcroppings and rocks under the water as you see above it.
Read the whole story here: http://www.washingtonpost.com/wp-srv/special/local/the-perils-of-great-falls/