345:
276:
40:
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332:. 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). A pillar at the Virginia overlook, well above the river, marks the level reached during the
324:
again, the power of the falls will be reduced due to a shorter vertical drop and likewise downcutting will slow down. Should the ocean level exceed the height of the falls, downcutting would reverse entirely and silt would fill in the now-underwater falls.
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79:
1809:
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The river cascades over a series of 20-foot (6.1 m) falls, dropping a total of 76 feet (23 m) in elevation over a distance of less than 1 mile (1.6 km).
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1016:
260:, both accessible from Maryland, offer scenic views of the Great Falls. There also are overlook points on the Virginia side.
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851:
550:
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was built in the early 19th century on the
Maryland side of the falls. It ultimately connected the Potomac tidewater with
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72:
376:. The Chesapeake and Ohio Canal also used the Great Falls as a feeder (now abandoned) to supply water for its own use.
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510:"History & Culture - Chesapeake & Ohio Canal National Historical Park (U.S. National Park Service)"
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1991:
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2026:
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226:
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364:, built in the 18th century, can be found on the Virginia side. The canal was commissioned by
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2011:
1971:
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and consisted of a system of five locks to allow barges to avoid the falls. Later on, the
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1951:
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310:, about 35,000 years ago, when sea level most recently dropped, causing the Potomac to
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2016:
1961:
1941:
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1214:
951:
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845:
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1996:
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1411:
1369:
1341:
1318:
1269:
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757:
311:
306:, metagraywackes, and metaconglomerates. The Falls themselves formed during the
292:
2036:
1976:
1625:
1400:
1355:
1264:
856:
353:
94:
81:
1946:
1685:
1289:
1284:
111:
291:
The rocks of the falls are about 750 million years old, dating to the late
283:
267:(about 5 miles downstream) are named in contradistinction to one another.
1740:
625:
615:
360:
Multiple canal systems were built around Great Falls. The remains of the
303:
233:
222:
214:
200:
542:
485:"The Patowmack Canal - Great Falls Park (U.S. National Park Service)"
299:
245:
199:. The Potomac and the falls themselves are legally entirely within
343:
282:
274:
401:"Great Falls, Maryland, United States - World Waterfall Database"
458:
203:, since the state's border follows the south bank of the river.
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1854:
1762:
1647:
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949:
667:
546:
232:
The Great Falls area is popular for outdoor activities such as
328:
The
Potomac narrows as it passes over the falls and through
27:
Waterfalls on the
Potomac River in Maryland and Virginia
221:
parkland is along the northern banks of the river in
455:"Great Falls of the Potomac : Image of the Day"
430:"The Great Falls of the Potomac, Montgomery County"
164:
154:
144:
136:
128:
120:
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71:
56:
32:
2102:Tourist attractions in Montgomery County, Maryland
219:Chesapeake and Ohio Canal National Historical Park
2097:Tourist attractions in Fairfax County, Virginia
538:Great Falls Park Visitor Centers official site
558:
8:
183:is a series of rapids and waterfalls on the
1927:
1851:
1759:
1644:
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946:
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565:
551:
543:
29:
170:16,750 cu ft/s (474 m/s) (
2082:Landforms of Montgomery County, Maryland
385:
334:1936 Northeastern United States Floods
287:Mather Gorge downstream from the falls
187:, 14 miles (23 km) upstream from
2077:Landforms of Fairfax County, Virginia
1804:South Fork South Branch Potomac River
1776:North Fork South Branch Potomac River
424:
422:
420:
395:
393:
391:
389:
7:
635:Streams shown as: Major tributaries
2072:George Washington Memorial Parkway
348:Remains of the feeder dam for the
211:George Washington Memorial Parkway
171:
25:
38:
932:Tuscarora Creek (West Virginia)
713:South Fork Little Cacapon River
706:North Fork Little Cacapon River
461:. July 29, 2004. Archived from
295:era. The rocks are a resistant
163:
153:
127:
119:
405:www.worldwaterfalldatabase.com
213:, is on the southern banks in
1:
44:The Great Falls as seen from
2092:Rapids of the United States
1889:South Fork Shenandoah River
1868:North Fork Shenandoah River
225:. Both are operated by the
193:Montgomery County, Maryland
61:Montgomery County, Maryland
2128:
1765:South Branch Potomac River
1650:North Branch Potomac River
990:Tuscarora Creek (Maryland)
888:Little Conococheague Creek
689:South Branch Potomac River
682:North Branch Potomac River
434:Maryland Geological Survey
1937:
1926:
1863:
1850:
1771:
1758:
1656:
1643:
1260:
1247:
985:Catoctin Creek (Maryland)
980:Catoctin Creek (Virginia)
958:
945:
676:
663:
581:
370:Chesapeake and Ohio Canal
150:550 ft (170 m)
140:350 ft (110 m)
52:
37:
197:Fairfax County, Virginia
65:Fairfax County, Virginia
132:47 ft (14 m)
124:129 ft (39 m)
2112:Waterfalls of Virginia
2107:Waterfalls of Maryland
1992:Jennings Randolph Lake
1967:Breckenridge Reservoir
1611:Popes Creek (Virginia)
1571:Popes Creek (Maryland)
832:Little Tonoloway Creek
357:
288:
280:
2027:Stony River Reservoir
1134:Little Monocacy River
975:Little Catoctin Creek
347:
286:
278:
227:National Park Service
209:, managed as part of
116:Steep Tiered Cascades
95:38.99750°N 77.25250°W
18:Great Falls, Maryland
1987:Georgetown Reservoir
1982:Dalecarlia Reservoir
1932:Lakes and reservoirs
1586:Upper Machodoc Creek
1440:Little Hunting Creek
1163:Broad Run (Maryland)
1153:Broad Run (Virginia)
700:Little Cacapon River
651:subsubsubtributaries
611:District of Columbia
374:Cumberland, Maryland
1254:Tidal Potomac River
1235:Little Falls Branch
1181:Little Seneca Creek
952:Lower Potomac River
893:Conococheague Creek
726:Sideling Hill Creek
670:Upper Potomac River
644:(subsubtributaries)
465:on October 12, 2004
308:Last Glacial Period
191:, on the border of
100:38.99750; -77.25250
91: /
2067:Cascade waterfalls
2007:McMillan Reservoir
2002:Little Seneca Lake
1957:Lake Bernard Frank
1714:Little Wills Creek
1566:Port Tobacco River
1329:Washington Channel
1197:Great Seneca Creek
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289:
281:
238:whitewater rafting
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2053:
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2022:Sleepy Creek Lake
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1921:
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1845:
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1753:
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1532:Chopawamsic Creek
1243:
1242:
1077:Big Hunting Creek
1062:Little Pipe Creek
1046:Double Pipe Creek
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751:Capon Springs Run
721:Fifteenmile Creek
366:George Washington
279:Aerial view, 1945
178:
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46:Northern Virginia
16:(Redirected from
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2012:Mount Storm Lake
1972:Brushy Fork Lake
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1746:Green Spring Run
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1581:Piccowaxen Creek
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1517:Chicamuxen Creek
1512:Mattawoman Creek
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1435:Piscataway Creek
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1379:Northeast Branch
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1363:Northwest Branch
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1344:
1314:Boundary Channel
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1249:
1230:Cabin John Creek
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1174:Dry Seneca Creek
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263:Great Falls and
250:Billy Goat Trail
207:Great Falls Park
189:Washington, D.C.
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1621:Yeocomico River
1616:St. Marys River
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1335:Anacostia River
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1119:Ballenger Creek
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1098:Linganore Creek
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1084:Tuscarora Creek
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787:Grassy Lick Run
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516:. December 2020
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1952:Lake Artemesia
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1561:Nanjemoy Creek
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1553:Accokeek Creek
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1522:Quantico Creek
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1474:Occoquan River
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1469:Pomonkey Creek
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1295:Foundry Branch
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996:Monocacy River
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882:Tilhance Creek
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796:Tearcoat Creek
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532:External links
530:
527:
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491:. October 2020
476:
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416:
384:
383:
381:
378:
356:at Great Falls
350:Chesapeake Bay
341:
338:
314:its valley.
272:
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258:Olmsted Island
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2087:Potomac River
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2020:
2018:
2017:Lake Needwood
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1962:Lake Braddock
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1942:Lake Accotink
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1676:Georges Creek
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1547:Potomac Creek
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1502:Neabsco Creek
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1433:
1431:
1428:
1426:
1423:
1421:
1418:
1413:
1409:
1408:
1407:
1406:Hunting Creek
1404:
1402:
1399:
1397:
1396:Four Mile Run
1394:
1387:
1383:
1382:
1380:
1376:
1371:
1367:
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1280:Maddox Branch
1278:
1276:
1275:Donaldson Run
1273:
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1266:
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1262:
1259:
1255:
1250:
1246:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1216:
1215:Difficult Run
1213:
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1198:
1194:
1190:
1189:Tenmile Creek
1185:
1182:
1178:
1175:
1171:
1170:
1169:
1166:
1164:
1161:
1159:
1158:Sugarland Run
1156:
1154:
1151:
1146:
1142:
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1140:
1137:
1135:
1132:
1127:
1126:Bennett Creek
1123:
1120:
1116:
1113:
1109:
1106:
1102:
1099:
1095:
1092:
1091:Carroll Creek
1088:
1085:
1081:
1078:
1074:
1071:
1067:
1063:
1058:
1054:
1049:
1047:
1044:
1040:
1035:
1032:
1028:
1025:
1021:
1018:
1017:Alloway Creek
1014:
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948:
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905:Opequon Creek
903:
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891:
889:
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883:
879:
876:
872:
869:
865:
863:
860:
858:
855:
853:
852:Licking Creek
850:
847:
846:Meadow Branch
843:
841:
838:
833:
829:
828:
827:
824:
822:
819:
817:
816:Sir Johns Run
814:
808:
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773:
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731:Cacapon River
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631:West Virginia
629:
627:
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606:Variant names
604:
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584:
583:
580:
575:
574:Potomac River
568:
563:
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531:
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511:
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346:
339:
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323:
318:
315:
313:
309:
305:
301:
298:
297:metamorphized
294:
285:
277:
270:
268:
266:
261:
259:
255:
251:
247:
243:
242:rock climbing
239:
235:
230:
228:
224:
220:
216:
212:
208:
204:
202:
198:
194:
190:
186:
185:Potomac River
182:
169:
160:
159:Potomac River
157:
149:
147:
143:
139:
137:Average width
135:
131:
123:
115:
113:
109:
104:
76:
74:
70:
66:
62:
59:
55:
51:
47:
41:
36:
31:
19:
1997:Kingman Lake
1903:Middle River
1818:Lunice Creek
1810:Kettle Creek
1796:Seneca Creek
1722:Evitts Creek
1671:Savage River
1606:Mattox Creek
1601:Monroe Creek
1527:Little Creek
1464:Pohick Creek
1425:Henson Creek
1386:Paint Branch
1349:Watts Branch
1333:
1306:Piney Branch
1210:Watts Branch
1205:Muddy Branch
1168:Seneca Creek
1145:Little River
1105:Israel Creek
1039:Middle Creek
994:
967:
925:Middle Creek
911:Abrams Creek
875:Isaacs Creek
840:Sleepy Creek
804:
687:
680:
650:
621:Pennsylvania
518:. Retrieved
513:
504:
493:. Retrieved
488:
479:
467:. Retrieved
463:the original
449:
437:. Retrieved
433:
408:. Retrieved
404:
359:
330:Mather Gorge
327:
319:
316:
290:
265:Little Falls
262:
231:
205:
180:
179:
129:Total height
2042:Warden Lake
2032:Tidal Basin
1911:South River
1895:North River
1881:Smith Creek
1874:Cedar Creek
1782:Laurel Fork
1707:Brush Creek
1701:Wills Creek
1696:Warrior Run
1666:Abram Creek
1661:Stony River
1576:Gambo Creek
1542:Aquia Creek
1456:Daniels Run
1445:Dogue Creek
1420:Broad Creek
1412:Cameron Run
1370:Sligo Creek
1342:Pope Branch
1319:Tiber Creek
1270:Gulf Branch
1139:Goose Creek
1070:Owens Creek
1024:Piney Creek
1010:Marsh Creek
868:Hogue Creek
779:North River
772:Mill Branch
765:Edwards Run
758:Dillons Run
601:Tributaries
514:www.nps.gov
489:www.nps.gov
293:Precambrian
254:Bear Island
181:Great Falls
155:Watercourse
98: /
73:Coordinates
33:Great Falls
2061:Categories
2037:Trout Pond
1977:Burke Lake
1828:Mill Creek
1789:Mill Creek
1733:Mill Creek
1681:Laurel Run
1631:Hull Creek
1626:Coan River
1537:Tank Creek
1430:Swan Creek
1401:Oxon Creek
1356:Hickey Run
1300:Rock Creek
1265:Pimmit Run
1112:Bush Creek
1031:Toms Creek
1003:Rock Creek
918:Mill Creek
899:Back Creek
862:Back Creek
857:Cherry Run
737:Lost River
695:Town Creek
520:2023-03-16
495:2023-03-16
469:August 17,
410:2020-01-17
380:References
354:Ohio Canal
86:77°15′09″W
83:38°59′51″N
1947:Lake Anne
1686:New Creek
1494:Cedar Run
1487:Broad Run
1324:Rocky Run
1290:Spout Run
1285:Windy Run
744:Trout Run
167:flow rate
121:Elevation
1823:Mill Run
1741:Dans Run
1480:Bull Run
1225:Dead Run
1220:Rock Run
626:Virginia
616:Maryland
439:June 19,
304:gneisses
234:kayaking
223:Maryland
215:Virginia
201:Maryland
57:Location
1833:Big Run
596:Islands
591:Bridges
312:downcut
271:History
165:Average
576:system
340:Canals
300:schist
256:, and
248:. The
246:hiking
244:, and
217:, and
67:, U.S.
471:2010
459:NASA
441:2020
352:and
195:and
172:est.
112:Type
63:and
320:As
252:on
229:.
146:Run
2063::
512:.
487:.
457:.
432:.
419:^
403:.
388:^
336:.
302:,
240:,
236:,
174:)
1905:)
1901:(
1191:)
1187:(
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1060:(
1055:)
1051:(
1041:)
1037:(
809:)
803:(
798:)
794:(
789:)
785:(
653:)
649:(
566:e
559:t
552:v
523:.
498:.
473:.
443:.
413:.
20:)
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