Potomac River
Potomac River | |
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• coordinates | 39°11′43″N 79°29′28″W / 39.19528°N 79.49111°W |
• elevation | 3,060 ft (930 m) |
2nd source | South Branch |
• location | Near Monterey, Highland County, Virginia |
• coordinates | 38°25′30″N 79°36′27″W / 38.425°N 79.6075°W |
Source confluence | |
• location | Green Spring, West Virginia |
• coordinates | 39°31′39″N 78°35′15″W / 39.5275°N 78.5875°W |
Mouth | Chesapeake Bay |
• location | St. Mary's County, Maryland/Northumberland County, Virginia, United States |
• coordinates | 38°00′00″N 76°20′06″W / 38°N 76.335°W |
• elevation | 0 ft (0 m) |
Length | 405 mi (652 km) |
Basin size | 14,700 sq mi (38,000 km2) |
Discharge | |
• location | Little Falls, near Washington, D.C. (non-tidal; water years: 1931–2018)[2] |
• average | 11,498 cu ft/s (325.6 m3/s) (1931–2018) |
• minimum | 4,017 cu ft/s (113.7 m3/s) (2002) |
• maximum | 484,000 cu ft/s (13,700 m3/s) (1936) |
Discharge | |
• location | Point of Rocks, Maryland |
• average | 9,504 cu ft/s (269.1 m3/s) |
Discharge | |
• location | Hancock, Maryland |
• average | 4,168 cu ft/s (118.0 m3/s) |
Discharge | |
• location | Paw Paw, West Virginia |
• average | 3,376 cu ft/s (95.6 m3/s) |
Basin features | |
Tributaries | |
• left | Tokyo, Japan[3] |
The Potomac River (/pəˈtoʊmək/ ⓘ) is a major river in the Mid-Atlantic region of the United States that flows from the Potomac Highlands in West Virginia to the Chesapeake Bay in Maryland. It is 405 miles (652 km) long,[4] with a drainage area of 14,700 square miles (38,000 km2),[5] and is the fourth-largest river along the East Coast of the United States and the 21st-largest in the United States. More than 5 million people live within its watershed.
The river forms part of the borders between Maryland and
Course
The Potomac River runs 405 mi (652 km) from
The river has two sources. The source of the North Branch is at the Fairfax Stone located at the junction of
Once the Potomac drops from the
District of Columbia |
Maryland |
North Branch Potomac River
The source of the North Branch Potomac River is at the
South Branch Potomac River
The exact location of the South Branch's source is northwest of Hightown along U.S. Route 250 on the eastern side of Lantz Mountain (3,934 ft) in Highland County. From Hightown, the South Branch is a small meandering stream that flows northeast along Blue Grass Valley Road through the communities of New Hampden and Blue Grass. At Forks of Waters, the South Branch joins with Strait Creek and flows north across the Virginia/West Virginia border into Pendleton County.
The river then travels on a northeastern course along the western side of Jack Mountain (4,045 ft), followed by Sandy Ridge (2,297 ft) along U.S. Route 220. North of the confluence of the South Branch with Smith Creek, the river flows along Town Mountain (2,848 ft) around Franklin at the junction of U.S. Route 220 and U.S. Route 33. After Franklin, the South Branch continues north through the Monongahela National Forest to Upper Tract where it joins with three sizeable streams: Reeds Creek, Mill Run, and Deer Run.
Between Big Mountain (2,582 ft) and Cave Mountain (2,821 ft), the South Branch bends around the Eagle Rock (1,483 ft) outcrop and continues its flow northward into
In its eastern course from Petersburg into
At
The South Branch continues north parallel to
Flowing north of Romney, the river still follows the eastern side of Mill Creek Mountain until it creates a horseshoe bend at Wappocomo's Hanging Rocks around the George W. Washington plantation, Ridgedale. To the west of Three Churches on the western side of South Branch Mountain, 3,028 feet (923 m), the South Branch creates a series of bends and flows to the northeast by Springfield through Blue's Ford. After two additional horseshoe bends (meanders), the South Branch flows under the old Baltimore and Ohio Railroad mainline between Green Spring and South Branch Depot, and joins the North Branch to form the Potomac.
Upper Potomac River
This stretch encompasses the section of the Potomac River from the
Lower Potomac River
This section covers the Potomac from just above Harpers Ferry in West Virginia down to Little Falls, Maryland on the border between Maryland and Washington, DC. Along the way the following tributaries drain into the Potomac:
Tidal Potomac River
The Tidal Potomac River lies below the
History
Natural history
The river itself is at least 3.5 million years old,[6] likely extending back ten to twenty million years before the present when the Atlantic Ocean lowered and exposed coastal sediments along the fall line. This included the area at Great Falls, which eroded into its present form during recent glaciation periods.[9]
The stream gradient of the entire river is 0.14%, a drop of 930 m over 652 km.
Human history
"Potomac" is a European spelling of
The similarity of the name to the Ancient Greek word for river, potamos, has been noted for more than two centuries but it appears to be due to chance.[16][17][18]
The Potomac River brings together a variety of cultures throughout the watershed from the coal miners of upstream West Virginia to the urban residents of the nation's capital and, along the lower Potomac, the watermen of Virginia's Northern Neck.
Being situated in an area rich in
General Robert E. Lee crossed the river, thereby invading the North and threatening Washington, D.C., twice in campaigns climaxing in the battles of Antietam (September 17, 1862) and Gettysburg (July 1–3, 1863). Confederate General Jubal Early crossed the river in July 1864 on his attempted raid on the nation's capital. The river not only divided the Union from the Confederacy, but also gave name to the Union's largest army, the Army of the Potomac.[20]
Washington, D.C. began using the Potomac as its principal source of
Hydrology
Water supply and water quality
An average of approximately 486 million US gallons (1,840,000 m3) of water is withdrawn daily from the Potomac in the Washington area for water supply, providing about 78 percent of the region's total water usage, this amount includes approximately 80 percent of the drinking water consumed by the region's estimated 6.1 million residents.[5][24]
As a result of damaging floods in 1936 and 1937,[25] the Army Corps of Engineers proposed the Potomac River basin reservoir projects, a series of dams that were intended to regulate the river and to provide a more reliable water supply. One dam was to be built at Little Falls, just north of Washington, backing its pool up to Great Falls. Just above Great Falls, the much larger Seneca Dam was proposed whose reservoir would extend to Harpers Ferry.[26] Several other dams were proposed for the Potomac and its tributaries.
Dams on the Potomac River |
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When detailed studies were issued by the Corps in the 1950s, they met sustained opposition, led by
In 1940 Congress passed a law authorizing the creation of an interstate compact to coordinate water quality management among states in the Potomac basin. Maryland, West Virginia, Pennsylvania, Virginia, and the District of Columbia agreed to establish the Interstate Commission on the Potomac River Basin. The compact was amended in 1970 to include coordination of water supply issues and land use issues related to water quality.[33]
Beginning in the 19th century, with increasing
By the end of the 20th century, notable success had been achieved, as massive algal blooms vanished and recreational fishing and boating rebounded. Still, the aquatic
On November 13, 2007, the Potomac Conservancy, an environmental group, issued the river a grade of "D-plus", citing high levels of pollution and the reports of "
Top Ten Historic Crests of the Potomac River, 1877–2017 | |||||||
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Kitzmiller | Hancock | Williamsport | Shepherdstown | ||||
Harpers Ferry | Point of Rocks | Little Falls | Georgetown | ||||
Source: National Weather Service |
Discharge
The average daily flow during the water years 1931–2018 was 11,498 cubic feet (325.6 m3) /s.[2] The highest average daily flow ever recorded on the Potomac at Little Falls, Maryland (near Washington, D.C.), was in March 1936 when it reached 426,000 cubic feet (12,100 m3) /s.[2] The lowest average daily flow ever recorded at the same location was 601.0 cubic feet (17.02 m3) /s in September 1966[2] The highest crest of the Potomac ever registered at Little Falls was 28.10 ft, on March 19, 1936;[40][25] however, the most damaging flood to affect Washington, DC and its metropolitan area was that of October 1942.[41]
Legal issues
For 400 years Maryland and Virginia have disputed control of the Potomac and its North Branch since both states' original
From 1957 to 1996, the
The original charters are silent as to which branch from the upper Potomac serves as the boundary, but this was settled by the 1785 Compact. When West Virginia seceded from Virginia in 1863, the question of West Virginia's succession in title to the lands between the branches of the river was raised, as well as title to the river itself. Claims by Maryland to West Virginia land north of the South Branch (all of Mineral and Grant Counties and parts of Hampshire, Hardy, Tucker and Pendleton Counties) and by West Virginia to the Potomac's high-water mark were rejected by the Supreme Court in two separate decisions in 1910.[43][44]
Flora and fauna
Fish
A variety of fish inhabit the Potomac, including
After having been depressed for many decades, the river's population of
Freshwater fish of the Potomac River |
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*denotes naturalized species; Sources: |
Tidal freshwater fish of the Potomac River |
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Sources: |
Mammals
Mammals of the Potomac River Basin |
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*denotes introduced species Sources:
|
Early European colonists who settled along the Potomac found a diversity of large and small mammals living in the dense forests nearby.
were still present at that time, but had been hunted to extirpation by the middle of the 19th century. Among the denizens of the Potomac's banks, beavers and otters met a similar fate, while small populations of American mink and American martens survived into the 20th century in some secluded areas.There is no record of early settlers having observed marine mammals in the Potomac, but several sightings of Atlantic bottle-nosed dolphins (Tursiops truncatus) were reported during the 19th century. In July 1844. a pod of 14 adults and young was followed up the river by men in boats as high as the Aqueduct Bridge (approximately the same location occupied by Key Bridge today).[50]
Since 2015, perhaps as a result of warmer temperatures, rising water levels in the Chesapeake Bay and improving water quality in the Potomac, unprecedented numbers of Atlantic bottle-nosed dolphins have been observed in the river. According to Dr Janet Mann of Georgetown University's Potomac-Chesapeake Dolphin Project, more than 500 individual members of the species have been identified in the Potomac during this period.[51]
Birds
Birds of the Potomac River Basin |
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Reptiles
Turtles of the Potomac River Basin |
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*denotes naturalized species Sources: |
Snakes of the Potomac River basin |
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Sources: |
Lizards of the Potomac River Basin |
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Sources: |
Amphibians
Salamanders of the Potomac River Basin |
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Sources: |
Frogs and toads of the Potomac River Basin |
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*denotes naturalized species Sources: |
Additional images
Upper and lower Potomac
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Tidal Potomac
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Other
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See also
- Air Florida Flight 90
- List of cities and towns along the Potomac River
- List of crossings of the Potomac River
- List of islands on the Potomac River
- List of rivers of Maryland
- List of rivers of Virginia
- List of rivers of West Virginia
- List of tributaries of the Potomac River
- List of variant names of the Potomac River
- Potomac Heritage Trail
Notes and references
Notes
- ^ AQU: The diversion dam at Great Falls, often called the "Aqueduct Dam", was built in the 1850s by the US Army Corps of Engineers as part of the project assigned to them by Congress to supply clean water from above Great Falls to Washington, DC. Water diverted by the dam flows 12 miles through a 9-foot diameter pipeline to Dalecarlia Reservoir on the outskirts of the city where it is first allowed to settle and then filtered and purified before being distributed to consumers. Since 1927, potable water from Dalecarlia has also been provided to Arlington County and some other sections of nearby northern Virginia through three 20-inch diameter pipelines that cross the Potomac under the deck of Chain Bridge. In addition, there is nearby a 4-foot diameter conduit constructed in 1967 that traverses the Potomac beneath the riverbed which is used primarily for backup purposes.[52][53]
- ^ GHL: "Evidence of the ancient Potomac River bed can be seen in well-rounded boulders, smoothed surfaces and grooves, and beautifully formed potholes. Look for sandstone boulders along the trail, which were deposited by massive floods. The sandy soils along the river trail, with shells mixed in, are a result of sediment deposits from floods. Some of the oldest sediment deposits in the area can be found on Glade Hill, between the Matildaville and Carriage Road trails. Glade Hill was once an island in the Potomac River, and the deposits found there were left before Mather Gorge formed."[54]
- ^ PIF: "In the Late Pennsylvanian, the rocks of the Stubblefield Falls domain of the Mather Gorge Formation moved up relative to the Sykesville Formation on the steep, west-dipping Plummers Island fault and mylonite zones (Schoenborn, 2001) within an existing Plummers Island shear zone (figs. 5, 6). Shearing formed S2 cleavage with below-closure muscovite growth and more pervasive S2 cleavage in the Sykesville Formation. By the earliest Permian, all of the rocks in the Potomac terrane had cooled through 235°C (figs. 3, 5). Apatite fission-track data indicate cooling through ~90°C to 100°C in Early Jurassic to Early Cretaceous time, with increasing ages to the east, suggesting kilometer-scale rotation of the Potomac terrane in the Cretaceous and (or) Tertiary, with the west side up."[55]
- ^ BLK: "Two samples collected from the terrace dissected by Great Falls indicate that the Falls were established in their current location by 30 ky. A series of 6 samples taken from a vertical transect just below the falls, indicates that vertical incision continued a rate of 0.5 m/ky between 27 and 12 ky, increasing to nearly 1.0 m/ky during the Holocene. These data suggest that the drop over Great Falls is growing with time. A dramatic increase in outcrop weathering and soil depth 3.5 km downstream of the Falls, suggests that prior to establishment of the Great Falls knickzone, a similar feature was likely present near Black Pond. 10-Be data are not yet available for this paleo knick zone; however, a 10-Be model age >200 ky from the top of Plummers island 5 km down stream of Black Pond suggests a much older period of retreat led to the formation of the Black Pond paleo knick zone."[56]
- ^ PES: "The Potomac Estuary: From the Chain Bridge in Washington, DC, to Point Lookout at the confluence with the Chesapeake Bay, the Potomac Estuary is a long and narrow estuary—approximately 189 km. With its many tributaries and bays, however, the Potomac Estuary has a shoreline of 1,800 km. The Estuary meanders in a south, southeasterly direction, except for a sharp bend about halfway downriver. The Estuary has three well-defined and distinct zones. The upper zone, from Chain Bridge to Indian Head, is the tidal freshwater reach, with salinities of less than 0.5 parts per thousand (ppt). The middle reach, between Indian Head and the Route 301 Bridge at Morgantown, is the transition zone. The salinity of this zone varies from 0.5 to 7.0 ppt and is often referred to as the zone of maximum turbidity. The lower zone, from the 301 Bridge to Point Lookout, has salinities ranging from 7 to 16 ppt."[57]
- ^ TRI: The rocky western (upriver) and central portions of the island are part of the Piedmont Plateau, while the southeastern part is within the Atlantic Coastal Plain. At one point opposite Georgetown, the Atlantic Seaboard fall line between the Piedmont and the Coastal Plain can be seen as a natural phenomenon. The island has about 2.5-mile (4.0 km) of shoreline, and the highest area of the island (where the Mason mansion stood) is about 44 feet (13 m) above sea level.
References
- ^ "President Clinton: Celebrating America's Rivers". American Heritage Rivers. July 30, 1998. Archived from the original on April 28, 2014. Retrieved February 5, 2014.
- ^ a b c d e "USGS 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA". nwis.waterdata.usgs.gov. National Weather Service (NOAA). 2019. Archived from the original on October 28, 2020. Retrieved March 23, 2019.
- ^ "(Arakawa - Potomac sister rivers)". Interstate Commission on the Potomac River Basin. January 27, 2012. Archived from the original on December 27, 2013. Retrieved September 23, 2016.
- ^ a b c U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived March 29, 2012, at the Wayback Machine. Retrieved August 15, 2011
- ^ a b "Facts & FAQs". Interstate Commission on the Potomac River Basin (ICPRB), Rockville, MD. September 16, 2009. Archived from the original on January 15, 2010. Retrieved February 5, 2010.
- ^ a b "Geology of Potomac Heritage National Scenic Trail". Potomac Heritage. NPS. 2019. Archived from the original on December 7, 2020. Retrieved March 25, 2019.
- ^ "Potomac Riverkeeper Network". www.potomacriverkeepernetwork.org. Potomac Riverkeeper Network. 2019. Archived from the original on November 19, 2020. Retrieved March 25, 2019.
- ^ "Potomac River Basin Fact Sheet" (PDF). www.potomacriver.org. Interstate Commission on the Potomac River Basin (ICPRB). October 2015. Archived (PDF) from the original on December 16, 2017. Retrieved March 28, 2019.
- ^ Reed, John Calvin. "The River and the Rocks: The Geologic Story of Great Falls and the Potomac River Gorge" (PDF). pubs.usgs.gov. USGS. Archived (PDF) from the original on October 1, 2020. Retrieved March 24, 2019.
- ISBN 978-0-8061-3598-4. Archivedfrom the original on May 11, 2016.
- ^ Legends of Loudoun: An account of the history and homes of a border county of Virginia's Northern Neck, Harrison Williams, p. 26.
- ^ ISBN 978-0-684-84857-0.
- ISBN 0-89865-255-3.
- ^ "Potomac River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Chesapeake Swan Song exhibition opens April 11 at CBMM". Chesapeake Bay Maritime Museum. January 26, 2015. Archived from the original on February 28, 2018. Retrieved February 28, 2018.
- ^ Jefferson, Thomas (1814). The Proceedings of the Government of the United States, in Maintaining the Public Right to the Beach of the Missisipi: Adjacent to New-Orleans, Against the Intrusion of Edward Livingston. Edward J. Coale. pp. 200–. Archived from the original on December 8, 2020. Retrieved November 15, 2020.
I have heard of an etymologist who derived the name of the river Potomac from the Greek Potamos. This derivation is quite as probable as that of beach from beotian; being founded on a much greater similarity of sound, as well as analogy of sense.
- ISBN 978-1-304-69872-8. Archivedfrom the original on December 7, 2020. Retrieved November 15, 2020.
- ISBN 978-0-934893-23-7. Archivedfrom the original on December 8, 2020. Retrieved November 15, 2020.
- ^ Bugbee, Mary F. “The Early Planning of Sites for Federal and Local Use in Washington, D. C.” Records of the Columbia Historical Society, Washington, D.C., vol. 51/52, 1951, p. 19. JSTOR, http://www.jstor.org/stable/40067294. Retrieved 19 Feb. 2024.
- ISBN 978-1-60949-600-5.
- ISBN 0-8108-1732-2.
- ^ Ways, Harry C. (1996). The Washington Aqueduct: 1852-1992. (Baltimore, MD: U.S. Army Corps of Engineers, Baltimore District)
- ^ Washington Aqueduct
- ^ "The 10 Most Populous Metro Areas : July 1, 2015" (PDF). www.census.gov. US Census Bureau. July 2015. Archived (PDF) from the original on November 4, 2020. Retrieved April 9, 2019.
- ^ a b "1936 Flood Retrospective: The Flood of March 17-19 1936". weather.gov. NWS. March 16, 2016. Archived from the original on December 7, 2020. Retrieved March 26, 2019.
- ^ Carey, Frank (December 4, 1963). "Potomac Dam Is Opposed By Virginians". Fredericksburg Free-Lance Star. Retrieved November 13, 2009.
- ^ Grey, Karen (March 2018). "Canal Engineering from Dam 3 to Harpers Ferry" (PDF). candocanal.org. 'Along the Towpath', C&O Canal Association. Archived (PDF) from the original on May 22, 2020. Retrieved March 16, 2019.
- ^ Holdsworth, Bill (April 2013). "Level 51 (Dam #6)". candocanal.org. C&O Canal Association. Archived from the original on June 23, 2016. Retrieved March 16, 2019.
- ^ Unrau, Harland D. (August 2007). "Historical Resource Study: Chesapeake & Ohio Canal" (PDF). US Department of the Interior, National Park Service. pp. 208, 470. Archived (PDF) from the original on July 14, 2015. Retrieved March 16, 2019.
- ^ Joel Achenbach (May 5, 2002). "America's River". The Washington Post. pp. W12. Archived from the original on September 16, 2002.
- ^ "Jennings Randolph Lake, MD & WV" (PDF). www.nab.usace.army.mil. USACE (United States Corps of Engineers). February 2015. Archived (PDF) from the original on September 28, 2020. Retrieved April 5, 2019.
- ^ Scott, Pamela (2007), "Capital Engineers: The U.S. Army Corps of Engineers in the Development of Washington, D.C., 1790–2004." Archived February 26, 2012, at the Wayback Machine (Washington, DC: U.S. Army Corps of Engineers.) Publication No. EP 870-1-67. p. 256.
- ^ a b ICPRB. "Potomac Timeline." Archived January 5, 2011, at the Wayback Machine Updated 2008-04-15.
- ^ District of Columbia Water and Sewer Authority. Washington, DC. "History of Blue Plains Wastewater Treatment Plant." Archived March 17, 2015, at the Wayback Machine Accessed 2010-09-28.
- ^ U.S. Fish and Wildlife Service. Annapolis, MD (2009). "Intersex fish: Endocrine disruption in smallmouth bass." Archived March 3, 2016, at the Wayback Machine
- ^ Fahrenthold, David A. (November 13, 2007). "Potomac Recovery Deemed At Risk". The Washington Post. Archived from the original on July 1, 2011. Retrieved November 13, 2007.
- ^ "Potomac Report Card". Potomac Conservancy. March 28, 2018. Archived from the original on November 12, 2020. Retrieved March 26, 2019.
- ^ Lang, Marissa J. "Taking a swim in the Potomac? Weekly readings will reveal water quality and bacteria levels" Archived September 8, 2020, at the Wayback Machine. 2019-03-30. Retrieved 2019-03-30.
- ^ "Need a bigger boat: 35-pound bass caught on the Potomac River" Archived April 3, 2019, at the Wayback Machine. Washington Post. 2019-04-03. Accessed: 2019-04-03.
- ^ "Historic Crests for Potomac near Washington, DC (Little Falls)". National Weather Service - Water. 2019. Archived from the original on December 7, 2020. Retrieved March 23, 2019.
- ^ Little, Becky (September 14, 2018). "World War II-Era Flood Was the Worst in D.C.'s History". HISTORY. A&E Television Networks, LLC. Archived from the original on December 7, 2020. Retrieved March 23, 2019.
- ^ U.S. Supreme Court. Virginia v. Maryland, 540 U.S. 56 (2003)
- ^ Maryland v. West Virginia, 217 U.S. 1 (1910)
- ^ Maryland v. West Virginia, 217 U.S. 577 (1910)
- ^ Potomac snakeheads not related to others Archived September 30, 2007, at the Wayback Machine Associated Press, Baltimore Sun, April 27, 2007.
- ^ "Northern Snakehead". Virginia Department of Wildlife Resources. Archived from the original on November 12, 2020. Retrieved July 4, 2020.
- ^ Jim Cummins (2013). "Fishes of the freshwater potomac" (PDF). www.potomacriver.org. Interstate Commission on the Potomac River Basin. Archived (PDF) from the original on September 30, 2020. Retrieved February 27, 2018.
- ^ "Sharks! Watermen catch two 8-footers on same day". somdnews.com. Archived from the original on September 10, 2012. Retrieved December 17, 2011.
- ^ "THE POTOMAC RIVER AMERICAN SHAD RESTORATION PROJECT" (PDF). www.potomacriver.org. Interstate Commission on the Potomac River Basin. March 2014. Archived (PDF) from the original on September 30, 2020. Retrieved February 26, 2018.
- ^ "The Mysterious Dolphins of the Potomac". 2017. Archived from the original on September 30, 2017. Retrieved February 26, 2018.
- ^ "Potomac-Chesapeake Dolphin Project". 2018. Archived from the original on April 6, 2017. Retrieved February 26, 2018.
- ^ "Water, Water ... " by Larry Van Dyne, Washingtonian Magazine (March 2007)
- ^ "Sources of Northern Virginia Drinking Water", Virginia Places
- ^ Great Falls Geology Archived January 4, 2018, at the Wayback Machine, National Park Service, April 10, 2015
- ^ Michael J. Kunk, et al., Multiple Paleozoic Metamorphic Histories, Fabrics, and Faulting in the Westminster and Potomac Terranes, Central Appalachian Piedmont, Northern Virginia and Southern Maryland Archived December 31, 2017, at the Wayback Machine, U.S. Geological Survey, 23 November 2016
- ^ Paul Bierman, et al., Great Falls is 30,000 Years Old Archived September 7, 2008, at the Wayback Machine, Paper No. 35-5, Session No. 35, Geomorphic Process Rates on the Passive Margin, March 26, 2004. Geological Society of America Abstracts with Programs, Vol. 36, No. 2, p. 94
- ^ "Chapter One: Introduction" (PDF). Archived (PDF) from the original on December 7, 2020. Retrieved December 30, 2017.
Works cited
- Rice, James D., Nature and History in the Potomac Country: From Hunter-Gatherers to the Age of Jefferson. (2009), Baltimore: Johns Hopkins University Press; ISBN 978-0-8018-9032-1
- Smith, J. Lawrence, The Potomac Naturalist: The Natural History of the Headwaters of the Historic Potomac (1968), Parsons, WV: McClain Printing Co.; ISBN 978-0-87012-023-7
External links
- Advanced Hydrologic Prediction Service - Baltimore/Washington (Sterling, VA) - including Potomac River levels
- Potomac River level at Williamsport
- Potomac River level at Harpers Ferry