Great Falls Park
—National Park Service, U.S. Department of the Interior —The high-water marks seem hard to believe, but powerful Potomac River waters sometimes cover this area. How can that happen? High water occurs at least once a year when all the rocks in the falls are covered. Floods occur about every 10 years after extremely heavy rainfall or a series of storms upstream in the Potomac River watershed. When the deluge reaches Mather Gorge, where the riverbed narrows from nearly 1,000 feet into a rocky, mile-long funnel 60 to 100 feet wide, the waters have no place to rise but upward. As high waters recede, they deposit organic matter, minerals, and seeds that help make this one of the nation's most biologically diverse areas.
|Placed By||National Park Service, U.S. Department of the Interior|
|Marker Condition||No reports yet|
|Date Added||Monday, October 22nd, 2018 at 11:01pm PDT -07:00|
|UTM (WGS84 Datum)||18S E 304849 N 4318603|
|Decimal Degrees||38.99470000, -77.25340000|
|Degrees and Decimal Minutes||N 38° 59.682', W 77° 15.204'|
|Degrees, Minutes and Seconds||38° 59' 40.92" N, 77° 15' 12.24" W|
|Driving Directions||Google Maps|
|Area Code(s)||540, 703, 571, 202|
|Which side of the road?||Marker is on the right when traveling North|
|Closest Postal Address||At or near Old Carriage Rd, McLean VA 22102, US|
|Alternative Maps||Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap|
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