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90-711: Fort Hunt Park is open from dawn until dusk, year-round; access is from the George Washington Memorial Parkway or from Fort Hunt Road. Fort Hunt is located along the Potomac River just 11 miles south of Washington, D. C. Its proximity to the Nation's capital dramatically affected the land use history. What occurred on this site frequently mirrored the political and social history of the United States. The site began its existence as

180-689: A European spelling of Patawomeck , the Algonquian name of a Native American village on its southern bank. Native Americans had different names for different parts of the river, calling the river above Great Falls Cohongarooton , meaning "honking geese" and "Patawomke" below the Falls, meaning "river of swans". In 1608, Captain John Smith explored the river now known as the Potomac and made drawings of his observations which were later compiled into

270-417: A daily basis. They issue more than 734,000 weather and 850,000 river forecasts, and more than 45,000 severe weather warnings annually. NOAA data is also relevant to the issues of climate change and ozone depletion . The NWS operates NEXRAD , a nationwide network of Doppler weather radars which can detect precipitation and their velocities. Many of their products are broadcast on NOAA Weather Radio ,

360-489: A map and published in London in 1612. This detail from that map shows his rendition of the river that the local tribes had told him was called the "Patawomeck". The spelling of the name has taken many forms over the years from " Patawomeck " (as on Captain John Smith 's map) to "Patomake", "Patowmack", and numerous other variations in the 18th century and now "Potomac". The river's name was officially decided upon as "Potomac" by

450-502: A national drought early warning information system. The NOAA Commissioned Officer Corps is a uniformed service of men and women who operate NOAA ships and aircraft , and serve in scientific and administrative posts. Since 2001, the organization has hosted the senior staff and recent chair, Susan Solomon , of the Intergovernmental Panel on Climate Change 's working group on climate science. Hurricane Dorian

540-517: A network of radio transmitters that broadcasts weather forecasts, severe weather statements, watches and warnings 24 hours a day. The National Ocean Service (NOS) focuses on ensuring that ocean and coastal areas are safe, healthy, and productive. NOS scientists, natural resource managers, and specialists serve America by ensuring safe and efficient marine transportation, promoting innovative solutions to protect coastal communities, and conserving marine and coastal places. The National Ocean Service

630-553: A new agency to serve a national need for "better protection of life and property from natural hazards... for a better understanding of the total environment... [and] for exploration and development leading to the intelligent use of our marine resources". NOAA is a part of the Department of Commerce rather than the Department of Interior , because of a feud between President Nixon and his interior secretary, Wally Hickel , over

720-503: A portion of George Washington 's River Farm ; though it passed out of Washington's family's hands around the beginning of the 19th century, it remained farmland until not long after the American Civil War . A fort was constructed on the site as part of a plan, developed in the 1880s, to expand and strengthen fortifications around the city of Washington. Fort Hunt was planned to complement Fort Washington , located just across

810-646: A research grants program through the Climate Program Office, and 13 cooperative institutes with academia. Through NOAA and its academic partners, thousands of scientists, engineers, technicians, and graduate students participate in furthering our knowledge of natural phenomena that affect the lives of us all. The Air Resources Laboratory (ARL) is one of the laboratories in the Office of Oceanic and Atmospheric Research. It studies processes and develops models relating to climate and air quality, including

900-630: A series of large islands while it heads northeast to Moorefield . At Moorefield, the South Branch is joined by the South Fork South Branch Potomac River and runs north to Old Fields where it is fed by Anderson Run and Stony Run. At McNeill , the South Branch flows into the Trough where it is bound to its west by Mill Creek Mountain (2,119 ft) and to its east by Sawmill Ridge (1,644 ft). This area

990-665: A serpentine path through the eastern Allegheny Mountains. First, it flows northeast by the communities of Bloomington , Luke , and Westernport in Maryland and then on by Keyser , West Virginia to Cumberland , Maryland. At Cumberland, the river turns southeast. 103 miles (166 km) downstream from its source, the North Branch is joined by the South Branch between Green Spring and South Branch Depot , West Virginia from whence it flows past Hancock , Maryland and turns southeast once more on its way toward Washington, D.C. , and

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1080-661: A water intake 725 feet (220 m) offshore, citing potential harm to Maryland's interests by an increase in Virginia sprawl caused by the project. After years of failed appeals within the Maryland government's appeal processes, in 2000 Virginia took the case to the Supreme Court of the United States , which exercises original jurisdiction in cases between two states. Maryland claimed Virginia lost its riparian rights by acquiescing to MDE's permit process for 63 years (MDE began its permit process in 1933). A Special Master appointed by

1170-548: Is a modification of the flag of one of its predecessor organizations, the United States Coast and Geodetic Survey . The Coast and Geodetic Survey's flag, authorized in 1899 and in use until 1970, was blue, with a white circle centered in it and a red triangle centered within the circle. It symbolized the use of triangulation in surveying , and was flown by ships of the Survey. When NOAA was established in 1970 and

1260-682: Is an American scientific and regulatory agency charged with forecasting weather , monitoring oceanic and atmospheric conditions, charting the seas , conducting deep-sea exploration , and managing fishing and protection of marine mammals and endangered species in the US exclusive economic zone . The agency is part of the United States Department of Commerce and is headquartered in Silver Spring, Maryland . NOAA traces its history back to multiple agencies, some of which are among

1350-463: Is at least 3.5 million years old, 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. The stream gradient of the entire river is 0.14%, a drop of 930 m over 652 km. "Potomac" is

1440-610: Is composed of eight program offices: the Center for Operational Oceanographic Products and Services, the Office for Coastal Management, the National Centers for Coastal Ocean Science, the Office of Coast Survey , the Office of National Geodetic Survey , the Office of National Marine Sanctuaries , the Office of Ocean and Coastal Resource Management, and the Office of Response and Restoration . There are two NOS programs,

1530-950: Is currently re-bounding as a result of the ICPRB 's successful "American Shad Restoration Project" that was begun in 1995. In addition to stocking the river with more than 22 million shad fry, the Project supervised the construction of a fishway that was built to facilitate the passage of adults around the Little Falls Dam on the way to their traditional spawning grounds upstream.   *denotes naturalized species; Sources: Striped mullet Mugil cephalus Spot Leiostomus xanthurus Spotted seatrout Cynoscion nebulosus Atlantic Croaker Micropogonias undulatus National Oceanic and Atmospheric Administration The National Oceanic and Atmospheric Administration (abbreviated as NOAA / ˈ n oʊ . ə / NOH -ə )

1620-716: Is home to over 40 NOAA sub-agencies and offices, including the National Weather Service . Richard (Rick) W. Spinrad is the 11th and current Under Secretary for Oceans and Atmosphere and NOAA Administrator. He was nominated by President Biden, and his nomination was confirmed by the US Senate on June 17, 2021, by voice vote. He was sworn in on June 23, 2021. From February 25, 2019, to January 20, 2021, Neil Jacobs , Assistant Secretary of Commerce for Environmental Observation and Prediction, served as acting Under Secretary of Commerce for Oceans and Atmosphere at

1710-535: Is led by a NOAA Corps two-star Rear Admiral , who also commands the NOAA Corps. The National Geodetic Survey (NGS) is a major surveying organization in the United States. The National Integrated Drought Information System is a program within NOAA with an interagency mandate to coordinate and integrate drought research, building upon existing federal, tribal, state, and local partnerships in support of creating

1800-762: Is located on its banks, as is Mount Vernon , the home of "Father of his Country" George Washington . During the American Civil War, the river became the boundary between the Union and the Confederacy , and the Union's largest army, the Army of the Potomac , was named after the river. The Potomac River runs 405 mi (652 km) from Fairfax Stone Historical Monument State Park in West Virginia on

1890-547: Is part of NOAA's Office of Oceanic and Atmospheric Research, located in Miami , Florida . AOML's research spans hurricanes, coastal ecosystems, oceans, and human health, climate studies, global carbon systems, and ocean observations. AOML's organizational structure consists of an Office of the Director and three scientific research divisions, Physical Oceanography, Ocean Chemistry and Ecosystems, and Hurricane Research. The Office of

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1980-402: Is said that President Abraham Lincoln used to escape to the highlands on summer nights to escape the river's stench. In the 1960s, with dense green algal blooms covering the river's surface, President Lyndon Johnson declared the river "a national disgrace" and set in motion a long-term effort to reduce pollution from sewage and restore the beauty and ecology of this historic river. One of

2070-527: Is the annual update charts of the ongoing impact of changing conditions on the environment and community by NOAA. In 2019, it was compiled by 81 scientists from 12 nations. The Office of Marine and Aviation Operations is responsible for the fleet of NOAA ships, aircraft, and diving operations. It is the largest research fleet in the Federal government. Its personnel is made up of federal civil service employees and NOAA Corps Commissioned Officers . The office

2160-443: Is the habitat to bald eagles . The Trough passes into Hampshire County and ends at its confluence with Sawmill Run south of Glebe and Sector . The South Branch continues north parallel to South Branch River Road ( County Route 8) toward Romney with a number of historic plantation farms adjoining it. En route to Romney, the river is fed by Buffalo Run, Mill Run , McDowell Run, and Mill Creek at Vanderlip . The South Branch

2250-526: Is traversed by the Northwestern Turnpike ( U.S. Route 50 ) and joined by Sulphur Spring Run where it forms Valley View Island to the west of town. 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

2340-607: The Allegheny Plateau to Point Lookout , Maryland, and drains 14,679 sq mi (38,020 km ). The length of the river from the junction of its North and South Branches to Point Lookout is 302 mi (486 km). The river has two sources. The source of the North Branch is at the Fairfax Stone located at the junction of Grant , Tucker , and Preston counties in West Virginia . The source of

2430-807: The Atlantic coastal plain . Once the Potomac drops from the Piedmont to the Coastal Plain at the Atlantic Seaboard fall line at Little Falls , tides further influence the river as it passes through Washington, D.C., and beyond. Salinity in the Potomac River Estuary increases thereafter with distance downstream. The estuary also widens, reaching 11 statute miles (17 km) wide at its mouth, between Point Lookout, Maryland, and Smith Point , Virginia, before flowing into

2520-651: The Birmingham, Alabama office of the National Weather Service issued a tweet that appeared to contradict Trump, saying that Alabama "will NOT see any impacts from Dorian". On September 6, NOAA published a statement from an unidentified spokesperson supporting Trump's September 1 claim. The statement also labelled the Birmingham, Alabama branch of the National Weather Service's contradiction of Trump as incorrect. The New York Times reported that

2610-522: The Board on Geographic Names in 1931. 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. 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,

2700-579: The Chesapeake Bay . 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

2790-1545: The Fall Line . This 108-mile (174-km) stretch encompasses the Potomac from a short distance below the Washington, DC - Montgomery County line, just downstream of the Little Falls of the Potomac River , to the Chesapeake Bay . Along the way the following tributaries drain into the Potomac: Pimmit Run , Gulf Branch , Donaldson Run , Windy Run , Spout Run , Maddox Branch , Foundry Branch , Rock Creek , Rocky Run, Tiber Creek , Roaches Run, Washington Channel , Anacostia River , Four Mile Run , Oxon Creek , Hunting Creek , Broad Creek , Henson Creek, Swan Creek, Piscataway Creek , Little Hunting Creek , Dogue Creek , Accotink Creek , Pohick Creek , Pomonkey Creek , Occoquan River , Neabsco Creek , Powell's Creek , Mattawoman Creek , Chicamuxen Creek , Quantico Creek , Little Creek , Chopawamsic Creek , Tank Creek , Aquia Creek , Potomac Creek , Nanjemoy Creek , Chotank Creek , Port Tobacco River , Popes Creek , Gambo Creek , Clifton Creek , Piccowaxen Creek , Upper Machodoc Creek , Wicomico River , Cobb Island , Monroe Creek , Mattox Creek , Popes Creek , Breton Bay, Leonardtown , St. Marys River , Yeocomico River , Coan River , and Hull Creek . The river itself

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2880-563: 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. Beginning in the 19th century, with increasing mining and agriculture upstream and urban sewage and runoff downstream, the water quality of the Potomac River deteriorated. This created conditions of severe eutrophication . It

2970-824: The Landsat satellite system. Since May 1998, NESDIS has operated the Defense Meteorological Satellite Program (DMSP) satellites on behalf of the Air Force Weather Agency . New generations of satellites are developed to succeed the current polar orbiting and geosynchronous satellites, the Joint Polar Satellite System , and GOES-R , which launched in November 2016. NESDIS runs the Office of Projects, Planning, and Analysis (OPPA) formerly

3060-650: 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, with a drainage area of 14,700 square miles (38,000 km ), and is the fourth-largest river along the East Coast of the United States . More than 6 million people live within its watershed . The river forms part of

3150-877: The Mussel Watch Contaminant Monitoring Program and the NOAA Integrated Ocean Observing System (IOOS). There are two staff offices, the International Program Office and the Management and Budget Office. The National Environmental Satellite, Data, and Information Service (NESDIS) was created by NOAA to operate and manage the US environmental satellite programs, and manage NWS data and those of other government agencies and departments. NESDIS's National Centers for Environmental Information (NCEI) archives data collected by

3240-571: The NOAA Commissioned Corps . Project 2025 has proposed to get rid of the Office of Oceanic and Atmospheric Research , which would "dismantle" NOAA's research division. Since 1993, NOAA's administrative headquarters has been located at the Silver Spring Metro Center office complex in downtown Silver Spring, Maryland . The consolidated 1.2 million SF, four-building campus was constructed in 1993 and

3330-727: The National Oceanic and Atmospheric Administration Fisheries Office of Law Enforcement in Silver Spring, Maryland , which is the primary site of marine resource law enforcement. NOAA's research, conducted through the Office of Oceanic and Atmospheric Research (OAR), is the driving force behind NOAA environmental products and services that protect life and property and promote economic growth. Research, conducted in OAR laboratories and by extramural programs, focuses on enhancing our understanding of environmental phenomena such as tornadoes, hurricanes, climate variability, solar flares, changes in

3420-608: The National Weather Service (NWS), the Office of Oceanic and Atmospheric Research (OAR) and the Office of Marine and Aviation Operations (OMAO). NOAA has more than a dozen staff offices, including the Office of the Federal Coordinator for Meteorology, the NOAA Central Library , the Office of Program Planning and Integration (PPI). The National Weather Service (NWS) is tasked with providing "weather, hydrologic and climate forecasts and warnings for

3510-619: The US Geological Survey and the Fish and Wildlife Service , began to identify fish in the Potomac and tributaries that exhibited "intersex" characteristics, as a result of endocrine disruption caused by some form of pollution. 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 " intersex " fish. Since then,

3600-547: The 1980s, through sewage plant upgrades and restrictions on phosphorus in detergents. 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 habitat of the Potomac River and its tributaries remain vulnerable to eutrophication, heavy metals , pesticides and other toxic chemicals, over-fishing, alien species , and pathogens associated with fecal coliform bacteria and shellfish diseases. In 2005 two federal agencies,

3690-625: The Anacostia and Hains Point areas of the District of Columbia. In the 1930s the site was converted into a Civilian Conservation Corps camp. During World War II it was the setting for top secret World War II military intelligence operations (known as "P.O. Box 1142" ) as well as an interrogation center for high-value prisoners of war. At one time the United States Army ran a school of finance there, but this did not last long. Today,

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3780-409: The Birmingham, Alabama National Weather Service's contradiction of Trump. The second order came on September 4 after Trump displayed an August 29 map that was altered with a black marker to show that Hurricane Dorian may hit Alabama. On September 9, speaking at an Alabama National Weather Service (NWS) meeting the Director of the National Weather Service gave a speech supporting Birmingham NWS and said

3870-702: The Chesapeake Bay. The source of the North Branch Potomac River is at the Fairfax Stone located at the junction of Grant , Tucker and Preston counties in West Virginia. From the Fairfax Stone, the North Branch Potomac River flows 27 mi (43 km) to the man-made Jennings Randolph Lake , an impoundment designed for flood control and emergency water supply. Below the dam, the North Branch cuts

3960-420: The Coast and Geodetic Survey's assets became a part of NOAA, NOAA based its own flag on that of the Coast and Geodetic Survey. The NOAA flag is, in essence, the Coast and Geodetic Survey flag, with the NOAA logo—a circle divided by the silhouette of a seabird into an upper dark blue and a lower light blue section, but with the "NOAA" legend omitted—centered within the red triangle. NOAA ships in commission display

4050-489: The Director oversees the Laboratory's scientific programs, as well as its financial, administrative, computer, outreach/education, and facility management services. Research programs are augmented by the Cooperative Institute for Marine and Atmospheric Studies (CIMAS), a joint enterprise with the University of Miami's Rosenstiel School of Marine and Atmospheric Science. CIMAS enables AOML and university scientists to collaborate on research areas of mutual interest and facilitates

4140-515: The NOAA September 6 statement was prompted by a threat from U.S. Commerce Secretary Wilbur Ross to fire high-level NOAA staff unless they supported Trump's claim. The Department of Commerce described this report as "false". Meanwhile, The Washington Post reported that NOAA had twice ordered National Weather Service employees not to provide "any opinion" on Hurricane Dorian and to "only stick with official National Hurricane Center forecasts". The first order came after Trump's September 1 comments and

4230-459: The NOAA, U.S. Navy , U.S. Air Force , the Federal Aviation Administration , and meteorological services around the world. It comprises the Center for Weather and Climate, previously NOAA's National Climatic Data Center , the National Coastal Data Development Center (NCDDC), the National Oceanographic Data Center (NODC), and the National Geophysical Data Center (NGDC)). In 1960, TIROS-1 , NASA's first owned and operated geostationary satellite,

4320-502: The Nixon Administration's Vietnam War policy. Nixon did not like Hickel's letter urging Nixon to listen to the Vietnam War demonstrators, and punished Hickel by not putting NOAA in the Interior Department. In 2007, NOAA celebrated 200 years of service in its role as successor to the U.S. Survey of the Coast . NOAA was officially formed in 1970. In 2021, NOAA had 11,833 civilian employees. Its research and operations are further supported by 321 uniformed service members, who make up

4410-534: The Office of Systems Development, the Office of Satellite Ground Systems (formerly the Office of Satellite Operations) the Office of Satellite and Project Operations, the Center for Satellite Applications and Research (STAR)], the Joint Polar Satellite System Program Office the GOES-R Program Office, the International & Interagency Affairs Office, the Office of Space Commerce and the Office of System Architecture and Advanced Planning. The National Marine Fisheries Service (NMFS), also known as NOAA Fisheries,

4500-423: The Potomac River in Maryland , and was completed in time for the Spanish–American War, though it did not see action in that conflict. The park was named after Brig. Gen. Henry Hunt, who served as chief of artillery of the Army of the Potomac during the Civil War. On June 11, 1932 General Douglas MacArthur established a field hospital at Fort Hunt to serve military veterans known as Bonus Marchers who were camped in

4590-437: The Potomac and its North Branch since both states' original colonial charters grant the entire river rather than half of it as is normally the case with boundary rivers. In its first state constitution adopted in 1776, Virginia ceded its claim to the entire river but reserved free use of it, an act disputed by Maryland. Both states acceded to the 1785 Mount Vernon Compact and the 1877 Black-Jenkins Award which granted Maryland

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4680-442: The Potomac as its principal source of drinking water with the opening of the Washington Aqueduct in 1864, using a water intake constructed at Great Falls. An average of approximately 486 million US gallons (1,840,000 m ) 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

4770-799: 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: Antietam Creek , Shenandoah River , Catoctin Creek (Virginia) , Catoctin Creek (Maryland) , Tuscarora Creek , Monocacy River , Little Monocacy River , Broad Run , Goose Creek , Broad Run , Horsepen Branch, Little Seneca Creek , Tenmile Creek , Great Seneca Creek , Old Sugarland Run, Muddy Branch , Nichols Run, Watts Branch , Limekiln Branch, Carroll Branch, Pond Run, Clarks Branch, Mine Run Branch, Difficult Run , Bullneck Run, Rock Run , Scott Run, Dead Run, Turkey Run, Cabin John Creek , Minnehaha Branch, and Little Falls Branch . The Tidal Potomac River lies below

4860-411: The Potomac, including bass , muskellunge , pike , walleye . The northern snakehead , an invasive species resembling the native bowfin , lamprey , and American eel , was first seen in 2004. Many species of sunfish are also present in the Potomac and its headwaters. Although rare, bull sharks can be found. After having been depressed for many decades, the river's population of American shad

4950-404: The Republican conference that my friends don't want to fund programs that are not properly authorized," said Lucas. "NOAA is very important, so we need to get it authorized." NOAA works toward its mission through six major line offices: the National Environmental Satellite, Data, and Information Service (NESDIS), the National Marine Fisheries Service (NMFS), the National Ocean Service (NOS),

5040-406: 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 Grant County . Into Grant, the South Branch follows

5130-413: The South Branch is located near Hightown in northern Highland County , Virginia. The river's two branches converge just east of Green Spring in Hampshire County , West Virginia, to form the Potomac. As it flows from its headwaters down to the Chesapeake Bay, the Potomac traverses five geological provinces: the Appalachian Plateau , the Ridge and Valley , the Blue Ridge , the Piedmont Plateau , and

5220-399: The Supreme Court to investigate recommended the case be settled in favor of Virginia, citing the language in the 1785 Compact and the 1877 Award. On December 9, 2003, the Court agreed in a 7–2 decision. 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,

5310-517: The US Department of Commerce and as NOAA's interim administrator. Jacobs succeeded Timothy Gallaudet , who succeeded Benjamin Friedman. The three served in series as NOAA's interim administrator throughout the first Trump Administration . In October 2017, Barry Lee Myers , CEO of AccuWeather , was proposed to be the agency's administrator by the Trump Administration. After two years in the nomination process, on November 21, 2019, Myers withdrew his name from consideration due to health concerns. NOAA

5400-434: The United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy", according to NOAA. This is done through a collection of national and regional centers, 13 river forecast centers (RFCs), and more than 120 local weather forecast offices (WFOs). They are charged with issuing weather and river forecasts , advisories, watches, and warnings on

5490-459: The Virginia side of the river, it was not completed until 1802. Financial troubles led to the closure of the canal in 1830. The Chesapeake and Ohio Canal operated along the banks of the Potomac in Maryland from 1831 to 1924 and also connected Cumberland to Washington, D.C. This allowed freight to be transported around the rapids known as the Great Falls of the Potomac River , as well as many other, smaller rapids. Washington, D.C. began using

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5580-432: 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,

5670-484: 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 . The Patowmack Canal was intended by George Washington to connect the Tidewater region near Georgetown with Cumberland , Maryland. Started in 1785 on

5760-473: The borders between Maryland and Washington, D.C. , on the left descending bank, and West Virginia and Virginia on the right descending bank. Except for a small portion of its headwaters in West Virginia, the North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters , which lie in Virginia. All navigable parts of

5850-416: The catching near Fletcher's Boat House of a Striped Bass estimated to weigh 35 lb (16 kg) was seen as a further indicator of the continuing improvement in the health of the river. The average daily flow during the water years 1931–2018 was 11,498 cubic feet (325.6 m ) /s. The highest average daily flow ever recorded on the Potomac at Little Falls, Maryland (near Washington, D.C.),

5940-445: The drinking water consumed by the region's estimated 6.1 million residents. As a result of damaging floods in 1936 and 1937, 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,

6030-495: The earliest in the federal government: The most direct predecessor of NOAA was the Environmental Science Services Administration (ESSA), into which several existing scientific agencies such as the United States Coast and Geodetic Survey , the Weather Bureau and the uniformed Corps were absorbed in 1965. NOAA was established within the Department of Commerce via the Reorganization Plan No. 4, and formed on October 3, 1970, after U.S. President Richard Nixon proposed creating

6120-454: The much larger Seneca Dam was proposed whose reservoir would extend to Harpers Ferry. Several other dams were proposed for the Potomac and its tributaries. Operational Non-Operational Planned, but never built When detailed studies were issued by the Corps in the 1950s, they met sustained opposition, led by U.S. Supreme Court Justice William O. Douglas , resulting in the plans' abandonment. The only dam project that did get built

6210-473: The nation's capital was to be located on the river. The 1859 siege of Harper's Ferry at the river's confluence with the Shenandoah was a precursor to numerous epic battles of the American Civil War in and around the Potomac and its tributaries, such as the 1861 Battle of Ball's Bluff and the 1862 Battle of Shepherdstown . General Robert E. Lee crossed the river, thereby invading the North and threatening Washington, D.C., twice in campaigns climaxing in

6300-432: The ozone, air pollution transport and dispersion , El Niño / La Niña events, fisheries productivity, ocean currents, deep sea thermal vents, and coastal ecosystem health. NOAA research also develops innovative technologies and observing systems. The NOAA Research network consists of seven internal research laboratories, extramural research at 30 Sea Grant university and research programs, six undersea research centers,

6390-415: The park is a popular picnic and jogging area. A playground and sports facilities are also available, and the United States Park Police man a substation at the park, as well as stables for their police horses. Lieutenant Commander Werner Henke , the highest-ranking German officer to be shot while in American captivity during World War II, was killed while attempting an escape from Fort Hunt in June 1944. He

6480-792: The participation of students and visiting scientists. AOML is a member of a unique community of marine research and educational institutions located on Virginia Key in Miami, Florida. In 1977, the Pacific Marine Environmental Laboratory (PMEL) deployed the first successful moored equatorial current meter – the beginning of the Tropical Atmosphere Ocean , TAO, array. In 1984, the Tropical Ocean-Global Atmosphere program (TOGA) program began. The Arctic Report Card

6570-541: 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. A variety of fish inhabit

6660-677: The river bank-to-bank from the low-water mark on the Virginia side while permitting Virginia full riparian rights short of obstructing navigation. From 1957 to 1996, the Maryland Department of the Environment (MDE) routinely issued permits applied for by Virginia entities concerning the use of the Potomac. However, in 1996 the MDE denied a permit submitted by the Fairfax County Water Authority to build

6750-502: The river has improved with a reduction in nutrient runoff, return of fish populations, and land protection along the river. As a result, the same group issued a grade of "B" for 2017 and 2018. In March 2019, the Potomac Riverkeeper Network launched a laboratory boat dubbed the "Sea Dog", which will be monitoring water quality in the Potomac and providing reports to the public on a weekly basis; in that same month,

6840-559: The river were designated as a National Recreation Trail in 2006, and the National Oceanic and Atmospheric Administration designated an 18-square-mile (47 km ) portion of the river in Charles County , Maryland, as the Mallows Bay–Potomac River National Marine Sanctuary in 2019. The river has significant historical and political significance, as the nation's capital of Washington, D.C.

6930-628: The section of the Potomac River from the confluence of its North and South Branches through Opequon Creek near Shepherdstown, West Virginia . Along the way the following tributaries drain into the Potomac: North Branch Potomac River , South Branch Potomac River , Town Creek , Little Cacapon River , Sideling Hill Creek , Cacapon River , Sir Johns Run , Warm Spring Run , Tonoloway Creek , Fifteenmile Creek , Sleepy Creek , Cherry Run , Back Creek , Conococheague Creek , and Opequon Creek . This section covers

7020-537: The significant pollution control projects at the time was the expansion of the Blue Plains Advanced Wastewater Treatment Plant , which serves Washington and several surrounding communities. Enactment of the 1972 Clean Water Act led to construction or expansion of additional sewage treatment plants in the Potomac watershed. Controls on phosphorus , one of the principal contributors to eutrophication, were implemented in

7110-405: The team "stopped public panic" and "ensured public safety". He said that when Birmingham issued their instructions they were not aware that the calls they were receiving were a result of Trump's tweet. The acting chief scientist and assistant administrator for the ocean and atmospheric research said he is "pursuing the potential violations" of the agency's scientific integrity policy. The NOAA flag

7200-521: The transport, dispersion , transformation and removal of pollutants from the ambient atmosphere. The emphasis of the ARL's work is on data interpretation, technology development and transfer. The specific goal of ARL research is to improve and eventually to institutionalize prediction of trends, dispersion of air pollutant plumes , air quality , atmospheric deposition, and related variables. The Atlantic Oceanographic and Meteorological Laboratory (AOML),

7290-537: The watermen of Virginia's Northern Neck. Being situated in an area rich in American history and American heritage has led to the Potomac being nicknamed "the Nation's River". George Washington , the first President of the United States , was born in, surveyed, and spent most of his life within, the Potomac basin. All of Washington, D.C., the nation's capital city , also lies within the watershed. The First United States Congress by act of July 16, 1790 stated that

7380-421: 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. This stretch encompasses

7470-621: The western side of Cave Mountain through the 20-mile (32 km) long Smoke Hole Canyon , until its confluence with the North Fork at Cabins , where it flows east to Petersburg . At Petersburg, the South Branch Valley Railroad begins, which parallels the river until its mouth at Green Spring . In its eastern course from Petersburg into Hardy County , the South Branch becomes more navigable allowing for canoes and smaller river vessels. The river splits and forms

7560-478: Was Jennings Randolph Lake on the North Branch. The Corps built a supplementary water intake for the Washington Aqueduct at Little Falls in 1959. 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

7650-630: Was an extremely powerful and destructive tropical cyclone that devastated the northwestern Bahamas and caused significant damage to the Southeastern United States and Atlantic Canada in September 2019. By September 1, NOAA had issued a statement saying that the "current forecast path of Dorian does not include Alabama". However, on that date, President Donald Trump tweeted that Alabama, among other states, "will most likely be hit (much) harder than anticipated". Shortly thereafter,

7740-747: Was created by an executive order in 1970 and has never been established in law, despite its critical role. In January 2023, The Washington Post reported that Congressman Frank Lucas , the new chair of the House Science, Space and Technology Committee, had released draft legislation to make NOAA an independent agency, rather than it being part of the Commerce Department. Lucas' push was in response to Republican leaders who had signaled plans to slash funding for agencies and programs that continued to receive annual appropriations, but had not been reauthorized by Congress. "It's been made quite clear in

7830-539: Was in March 1936 when it reached 426,000 cubic feet (12,100 m ) /s. The lowest average daily flow ever recorded at the same location was 601.0 cubic feet (17.02 m ) /s in September 1966 The highest crest of the Potomac ever registered at Little Falls was 28.10 ft, on March 19, 1936; however, the most damaging flood to affect Washington, DC and its metropolitan area was that of October 1942. For 400 years Maryland and Virginia have disputed control of

7920-451: Was initiated in 1871 with a primary goal of the research, protection, management, and restoration of commercial and recreational fisheries and their habitat, and protected species. The NMFS operates twelve headquarters offices, five regional offices, six fisheries science centers, and more than 20 laboratories throughout the United States and U.S. territories, which are the sites of research and management of marine resources. The NMFS operates

8010-561: Was later buried in the post cemetery on Fort Meade, Maryland. In 1980, the remaining structures at the site were added to the National Register of Historic Places as the Fort Hunt Historic District. The surrounding community of Fort Hunt, Virginia takes its name from the original fort. Potomac River The Potomac River ( / p ə ˈ t oʊ m ə k / ) is a major river in

8100-401: Was launched. Since 1966, NESDIS has managed polar orbiting satellites (POES). Since 1974, it has operated geosynchronous satellites (GOES). In 1979, NOAA's first polar-orbiting environmental satellite was launched. Current operational satellites include NOAA-15 , NOAA-18 , NOAA-19 , GOES 13 , GOES 14 , GOES 15 , Jason-2 and DSCOVR . In 1983, NOAA assumed operational responsibility for

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