by Dick Hall-Sizemore

Mountain Lake in Giles County has two claims to fame. First, it was the location at which much of the 1987 hit movie Dirty Dancing was filmed. Second, it is one of only two natural lakes in Virginia. (Lake Drummond in the Dismal Swamp in Chesapeake is the other one.) However, the basis of that second claim may be fading away.
Mountain Lake is situated in a bowl, or valley, between two converging mountain ridges. A stream, Pond Drain, flows through the valley. At one end of the valley is a narrow water gap. Salt Pond Mountain rises to the east immediately adjacent to the lake. The Eastern Continental Divide runs along the crest of Salt Pond Mountain. Surface water on the western side of the mountain flows to the New River and, ultimately, to the Gulf of Mexico, while surface water on the eastern side flows to the Atlantic Ocean via the James River and its tributaries.

There has been considerable debate among geologists regarding the origin of Mountain Lake. The first scientific work on the lake was conducted by William Rogers. Rogers taught chemistry and natural philosophy at the College of William and Mary and was later chair of natural philosophy at the University of Virginia. While at UVa., he became the first state geologist and led the first geological survey of the state. He later founded the Massachusetts Institute of Technology. (Rogers Hall at William and Mary is named for him, as is Mt. Rogers, the tallest mountain in Virginia.) Rogersโs work was published posthumously in 1884. His conclusion for the origin of the lake: โRocks and earth gradually accumulating at the passage have dammed the waters up.โ
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