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87-538: Below grade, there are twenty catacomb-like cells, each an acre in extent, where sand was used to filter water from the Potomac River by way of the Washington Aqueduct . The purification system was a slow sand filter design that became obsolete by the late 20th century. In 1985, a new rapid sand filter plant replaced it across First Street beside the reservoir. The treatment system is operated by

174-689: 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

261-489: 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

348-450: A network of accessible park space, including 6.25 acres (2.53 ha) on the southern end of the site, a 1-acre healing garden on the north end, and an acre of green space over a preserved cell at the north end. The VMP proposal has met with opposition from some neighborhood groups. The team has been meeting with the surrounding neighborhoods since before its selection in 2007 and has included neighborhood input in project revisions. The plan

435-609: A number of cells in order to provide access to the tunnel they will build on First Street, NW to manage the system. In 2016, courts sided with community activists and rejected the DC Zoning Commission's approval of a $ 720 million project to transform the site into retail, office and residential space. In summer 2021 the City Council passed legislation authorizing demolition at the McMillan site. In October 2021

522-659: A report dismissing the idea of health risks from the water. The story was picked up by The Washington Post , which ran front-page stories about the problem in January 2004. This led to a Congressional investigation, which found that the CDC had made "scientifically indefensible" claims about the lack of health effects from the lead in DC's water supply. The problem was traced to the Washington Aqueduct decision to replace

609-630: 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

696-665: 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

783-724: 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

870-795: 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, 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

957-463: 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

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1044-1237: 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 DC Water The District of Columbia Water and Sewer Authority (DC Water) provides drinking water , sewage collection, and sewage treatment for Washington, D.C. The utility also provides wholesale wastewater treatment services to several adjoining municipalities in Maryland and Virginia , and maintains more than 9,000 public fire hydrants in Washington, D.C. DC Water

1131-423: Is discharged to the Potomac is highly treated and meets some of the most stringent NPDES permit limits in the United States. Historically, wastewater treatment plants have contributed nutrients such as phosphorus and nitrogen to the waterways in which they discharge. These nutrients have been found to deplete oxygen in the marine environment, a process that is detrimental to fish and other aquatic life . Since

1218-762: 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

1305-717: Is responsible for all daily operations and reports to the DC Water Board of Directors. The current President/CEO is David L. Gadis. DC Water purchases drinking water from the Washington Aqueduct division of the Army Corps of Engineers. The Aqueduct sources the water from the Potomac River at Great Falls and Little Falls , north of the District. The Aqueduct treats the water, and DC Water distributes it through 1,300 miles (2,100 km) of water pipes throughout

1392-402: 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

1479-443: 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

1566-557: Is then included in the overall District of Columbia budget. Together these two budgets are presented annually to Congress for approval. When DC Water was created as an independent authority in 1996, its finances were separate from those of the District of Columbia. The independence of DC Water with regard to finance, procurement and personnel matters was affirmed by Congress under the District of Columbia Water and Sewer Authority Independence Preservation Act of 2008. A President and CEO

1653-526: 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

1740-545: 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

1827-512: The Army Corps of Engineers . Public access to the site has been restricted since World War II , when the Army erected a fence to guard against sabotage of the city's water supply. Until recently, specially arranged biannual tours were arranged for scores of visitors curious about the odd-looking structures. The site was never reopened to the public on the same basis as before the war. In 1991,

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1914-807: 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

2001-522: 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,

2088-516: 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

2175-555: The D.C. Court of Appeals ruled that the proposed development project may proceed pursuant to the legislation. Demolition of the site commenced in October 2021. In May 2023, the Washington Business Journal reported that the site had been renamed from the "McMillan Sand Filtration Site" to the "Reservoir District." As of January 2024, the site is being developed. On June 15, 2024 D.C. Mayor Muriel Bowser cut

2262-1482: 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

2349-563: 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

2436-619: 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,

2523-423: The 1970s a major expansion commenced that led to construction of advanced wastewater treatment components, and by 1983 the capacity was 300 mgd. In addition to Washington, the plant serves several adjacent communities in Maryland and Virginia . Drinking water and sewage treatment services were initially provided by the District of Columbia government. DC Water was established as an independent agency in 1996 by

2610-547: 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,

2697-533: The Authority was found to contain lead levels of at least 1,250 parts per billion (ppb)—about 83 times higher than the accepted safe level of 15 ppb. The discovery was made by Marc Edwards , a civil engineering professor specializing in plumbing who DC Water had hired to investigate complaints of plumbing corrosion. DC Water threatened to cut off Edwards's funding unless he abandoned his investigation. The Centers for Disease Control and Prevention (CDC) released

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2784-702: 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

2871-696: The Corps of Engineers declared the property surplus and asked the General Services Administration to dispose of it. GSA iterated its position that open space was not the highest and best use of the property, and insisted on selling the property for mixed commercial development over the objections of the McMillan Park Committee. The District of Columbia government purchased the site from the federal government in 1987 for $ 9.3M, in order to facilitate development . Since

2958-629: The D.C. Historic Preservation Review Board designated McMillan Park a Historic Landmark and nominated the site for the National Register of Historic Places . It included the site on their "List of Most Endangered Properties in 2000" and again in 2005. The 1905 completion of the McMillan Reservoir Sand Filtration Plant was a Washington public health milestone. Its innovative system of water purification, which relied on sand rather than chemicals, led to

3045-525: The District Government and the U.S. federal government. In 2010, under new leadership, the Authority underwent a rebranding effort. The rebranding included a new logo, a new color palette, and a new name. Since its inception, the Authority had been doing business as DC Water. The legal name of the agency remains the District of Columbia Water and Sewer Authority. An eleven-member Board of Directors governs DC Water. Six Board Members represent

3132-525: The District of Columbia. DC Water also manages over 1,800 miles (2,900 km) of sewer lines and operates the Blue Plains Advanced Wastewater Treatment Plant. The plant discharges to the Potomac River at the southernmost tip of the District. The National Association of Clean Water Agencies (NACWA) honored DC Water with its Research and Technology Award, given annually to member agencies who contribute to

3219-499: The District. Prince George's County and Montgomery County each have two Board Members. Fairfax County has a single Board Member. Each participating jurisdiction is a signatory to the Blue Plains Intermunicipal Agreement, which spells out the roles and responsibilities for each party and addresses facilities management, capacity allocation, and financing. The Authority develops its own budget, which

3306-465: The NPDES permit effective September 2010, reducing nitrogen levels to 4.7 million pounds per year. DC Water plans to achieve these levels by constructing new facilities at Blue Plains to perform enhanced nitrogen removal (ENR). The total cost of the project is nearly $ 1 billion. In FY 09, the Authority rehabilitated pumping equipment and accessories in one of two stations that pump incoming wastewater into

3393-437: 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

3480-442: 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

3567-986: 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

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3654-411: 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

3741-545: 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

3828-724: 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

3915-514: 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,

4002-518: 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

4089-507: 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,

4176-651: 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

4263-473: 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

4350-526: The capacity of the pipe. To prevent sewer backups and flooded streets, these combined sewers may discharge into the Anacostia and Potomac Rivers and Rock Creek , a phenomenon known as combined sewer overflows (CSOs). To date, DC Water has significantly reduced CSOs by eliminating approximately 40 percent of the overflows through a $ 140 million construction and mitigation program. This investment included inflatable dams to catch and store overflows during rainstorms, tide gates to keep river water from flowing into

4437-416: 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.),

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4524-538: The center of a vault to the white sand beneath when a manhole cover had been left open." During the Corps of Engineers ’ ownership, no commercial development of the site occurred. When the National Capital Planning Commission prepared the federal element of its first Comprehensive Plan in 1983, it included McMillan Park as among the "Parks, Open Space and Natural Features" of the city that "should be conserved and whose essential Open Space Character [be] maintained." The site's future became uncertain, though, in 1986 when

4611-405: The construction of an aqueduct system to provide a reliable supply of drinking water to the city from the Potomac River . The US Army Corps of Engineers designed and built the Washington Aqueduct , which began full operation in 1864. Filtration plants were added to the system in the 20th century. In 1938, the District of Columbia built a sewage treatment plant in the Blue Plains area, at

4698-403: The construction of the Nationals Park baseball stadium. (The government dissolved the NCRC in 2007 and merged its functions into the Office of the Deputy Mayor for Planning and Economic Development.) The government selected a development team, Vision McMillan Partners (VMP), in 2007. Their proposal includes a mix of uses, including housing, shopping and office space. The site would also include

4785-415: The cost of delivery of water and sewer service. A little more than half of the rates cover operations. Another quarter covers the cost of capital projects like replacement of aging water and sewer lines, valve replacements, and pump station improvements. Capital projects also include several projects designed to protect the environment and are required by the U.S. Environmental Protection Agency (EPA). Though

4872-445: 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,

4959-513: The elimination of typhoid epidemics and the reduction of many other communicable diseases in the city. A legacy of the City Beautiful Movement and an integral part of the McMillan Plan to modernize Washington, the complex is an engineering wonder that served its original purpose until 1986. Residents from the ethnically diverse neighborhoods near the park expressed their "delight in this rigidly segregated city in being able to enjoy its amenities regardless of race. Courting couples promenaded on

5046-407: The field of biosolids usage and disposal or wastewater treatment. The research project must be completed in-house (or by a contractor working directly with the agency). It must relate to the collection process, treatment process, or reuse of wastewater. This innovation by the DC Water team has a global impact in protecting aquatic life in waterways that receive wastewater discharges. The year 2010 marks

5133-468: The geometrically laid out avenues on the east site under a canopy of clipped trees. Families, on hot summer nights, slept in the site to catch the summer breezes that blew over the escarpment. During World War I the Girl Scouts camped and grew vegetables on the site between North Capitol Street and First Street. Boys played ball games on the east portion where there were fewer manhole covers near Michigan Avenue. They laughed about sometimes falling through

5220-401: The highest grade of B+, and others scored as low as Cs and even Ds. The District of Columbia is one of 772 older cities in the country with a combined sewer system. The system covers about a third of the city and was built in the late 19th century to carry sanitary sewage and stormwater in the same pipe. The system operates well in dry weather. However, during rainstorms, the flow can exceed

5307-473: The mandate comes from the federal government, the funding sources for these construction projects are not identified. While a small amount of funding has come through the Clean Water Act and Safe Drinking Water Act and other grants, the majority of these capital costs are borne by the ratepayers. At Blue Plains, wastewater treatment goes beyond primary and secondary treatment levels to tertiary (or advanced) treatment . The effluent that leaves Blue Plains and

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5394-499: The mid-1980s, Blue Plains has reduced phosphorus to the limit of technology, primarily in support of water quality goals of the Potomac River, but also for the restoration of the Chesapeake Bay . The Chesapeake Bay Agreement, reached in 1987, was a first step in reducing nitrogen discharge to waterways that are tributary to the Chesapeake Bay. Under the agreement, the Bay states and the District committed to voluntarily reduce nitrogen loads by 40 percent from their 1985 levels. Blue Plains

5481-454: 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

5568-473: 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

5655-517: The nitrification/denitrification process and aims to meet the nitrogen reduction goals of the Chesapeake Bay Program. It will also increase energy efficiency. On the waterways, the Authority operates two skimmer boats that remove floatable debris from the Anacostia and Potomac rivers every Monday through Friday. These crews remove more than 400 tons of trash from our waterways each year. Plastic bottles, plastic bags, inflatable toys, baseballs, and environmental debris like tree limbs, are all skimmed from

5742-549: The plant and replaced aged infrastructure and equipment in the plant's final filters with a more effective system. All the upgrade projects were tied into the plant-wide process control system (PCS), which monitors and controls the plant's processes from a central location. Progress was achieved by implementing the nitrification/denitrification facilities upgrade to convert nitrification reactors from coarse to fine bubble diffusion and modify structures equipment. The rehabilitated and new equipment will support other ongoing upgrades to

5829-478: 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

5916-411: The ribbon at the Reservoir Park Recreation Center at the former McMillan Sand Filtration site. With this ceremony the new 6.2-acre park and recreation center were declared open to the public. 38°55′28.1″N 77°0′37.7″W  /  38.924472°N 77.010472°W  / 38.924472; -77.010472 Potomac River The Potomac River ( / p ə ˈ t oʊ m ə k / )

6003-414: 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

6090-422: 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,

6177-403: 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.

6264-521: The second consecutive year that DC Water has been recognized with this award. In 2010, DC Water received from NACWA the Platinum Peak Performance Award after receiving five consecutive Gold Awards for 100 percent compliance with permit limits. This award is presented to member agencies for exceptional compliance for their National Pollutant Discharge Elimination System (NPDES) permit limits. Rates paid by ratepayers cover

6351-628: 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

6438-584: The sewer system, sewer separation to eliminate CSO outfalls, and pumping station construction and rehabilitation to increase flow capacity. In 2013 the agency began construction of a deep tunnel system for its "Clean Rivers Project." The $ 2.4 billion, 20-year project will reduce CSOs by 96 percent overall and 98 percent in the Anacostia River. Once operational, the tunnel system will store the combined sewage during wet weather and release it gradually for treatment at Blue Plains. In 2001, water supplied by

6525-537: 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

6612-557: The southernmost tip of DC. The cost was $ 4 million. The plant was built to stop raw sewage from entering the Potomac and Anacostia Rivers . At that time, the plant was built to treat sewage from a population of 650,000, with a capacity of 100 million gallons per day (mgd). By 1943, the population grew to 1.5 million people, contributing much more sewage, and upgrades to the plant were necessary. Secondary treatment units were added in 1959, with an expanded discharge capacity of 240 mgd. In

6699-486: The time of purchase, the property has remained unused and closed to the public. The D.C. government began considering the McMillan Sand Filtration Site for commercial and residential development again in 2007. The National Capital Revitalization Corporation (NCRC), a development agency created by the city, selected the site as part of a land swap deal involving Anacostia riverfront property and

6786-590: 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

6873-403: The waterways and deposited into oversized dumpsters for removal. In decades past, there used to be more oversized items, such as sofas and refrigerators. However, over the years, the skimmer boats have removed most of those. Still, there is the occasional unlikely item, such as the live deer that was recently rescued to dry ground. In addition to their full-time work assignments, these crews clean

6960-493: The way for special events like the Nation's Triathlon and high school crew competitions, as well as for conservation efforts. As a result of the work DC Water contributes, "The District, as a city, is head and shoulders above any other municipality in the Bay watershed," said Tom Schueler of the nonprofit Chesapeake Stormwater Network. In 2009, The Stormwater Network developed a stormwater performance grading scale. The District received

7047-421: 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

7134-621: 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

7221-407: 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

7308-613: Was founded in 1996 when the city government and the U.S. federal government established it as an independent authority of the city's government. DC Water provides more than 600,000 residents, 16.6 million annual visitors, and 700,000 people employed in the District of Columbia with water, sewage collection, and treatment. The agency also provides wholesale wastewater treatment for 1.6 million people in Montgomery and Prince George's counties in Maryland, and Fairfax and Loudoun counties in Virginia. In 1852, Congress commissioned

7395-596: 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

7482-569: Was the first plant to achieve that goal. Furthermore, every year since the full-scale implementation of the Biological Nitrogen Removal (BNR) process was completed in 2000, Blue Plains has every year successfully achieved and exceeded that goal of a 40 percent reduction. In Fiscal Year 2009, the BNR process at Blue Plains reduced the nitrogen load by more than 58 percent. DC Water and EPA agreed upon new nitrogen limits as part of

7569-621: Was unanimously approved by the Historic Preservation Review Board in May 2016, which will vote on the buildings on the site but not the overall Master Plan for redevelopment. In 2013 DC Water proposed a plan to use McMillan to provide neighborhood relief of flooding that plagued the Bloomingdale neighborhood, in which the site is situated. The plan calls for the use of two cells to retain water, and to demolish

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