Key Bridge (Washington, D.C.)
   HOME

TheInfoList



OR:

The Francis Scott Key Bridge, more commonly known as the Key Bridge, is a six-lane reinforced concrete arch bridge conveying U.S. Route 29 (US 29) traffic across the Potomac River between the Rosslyn neighborhood of Arlington County, Virginia, and the Georgetown neighborhood of Washington, D.C. Completed in 1923, it is Washington's oldest surviving road bridge across the Potomac River. Key Bridge was added to the National Register of Historic Places in 1996.


History


Deterioration of the Aqueduct Bridge

The Key Bridge replaced the older
Aqueduct Bridge Aqueduct Bridge may refer to: * Aqueduct Bridge (Clay City, Indiana), U.S. * Aqueduct Bridge (New York City), now called High Bridge, New York, U.S. * Aqueduct Bridge (Potomac River), between Georgetown, Washington, D.C. and Rosslyn, Virginia, U.S. ...
. The first Aqueduct Bridge was built in 1830 to carry the Chesapeake and Ohio Canal across the Potomac to connect with the Alexandria Canal on the Virginia shore. The bridge was converted into a roadway during the American Civil War. In 1866, the canal was restored and a new wooden roadway built over it atop trestles. The 1830 bridge was torn down in 1884, and a new structure built which opened in 1889. The Washington and Virginia abutments still survive. Both are located a short distance west of the Key Bridge. Between the two abutments, a pier remains in the river near the Virginia shore (See Demolition of Aqueduct Bridge). Proposals were made to replace the Aqueduct Bridge as early as 1901. But these proposals were delayed when the McMillan Plan was issued in 1902. The plan's proposals for new bridges across the Potomac called into question whether Aqueduct Bridge should be replaced or merely torn down. In the meantime, Congress approved repairs to the bridge in 1902 1908, and 1913..


The Carlin bill

In March 1914, Representative
Charles Creighton Carlin Charles Creighton Carlin (April 8, 1866 – October 14, 1938) was an American lawyer, newspaper publisher and Democratic politician who served in the United States House of Representatives representing Virginia's 8th congressional district. Ea ...
of Virginia sponsored legislation to replace Aqueduct Bridge with a new, $1 million structure. The Commissioners of the District of Columbia (the city's appointed government) approved the new bridge in June. Controversy over the new bridge immediately broke out. Senator
Claude A. Swanson Claude Augustus Swanson (March 31, 1862July 7, 1939) was an American lawyer and Democratic politician from Virginia. He served as U.S. Representative (1893-1906), Governor of Virginia (1906-1910), and U.S. Senator from Virginia (1910-1933), befor ...
, chairman of the Senate Committee on Public Works, wanted the new bridge built about downstream at the mouth of
Rock Creek Rock Creek or Rockcreek may refer to: Streams United States * Rock Creek (California) * Rock Creek (Fountain Creek tributary), Colorado * Rock Creek (Idaho) * Rock Creek (Kankakee River tributary), Illinois * Rock Creek (Wapsipinicon River tribut ...
(at about 30th Street NW), where it would cross
Analostan Island Theodore Roosevelt Island is an island and national memorial located in the Potomac River in Washington, D.C. During the Civil War, it was used as a training camp for the United States Colored Troops. The island was given to the federal governme ...
and the Potomac River to Rosslyn. Georgetown merchants strongly opposed this plan. There were some in Congress who wanted to repair the existing bridge, but a study by the United States Army Corps of Engineers in August 1914 showed that the existing structure was inadequate for the amount of traffic and too unstable to be saved. Secretary of War
Lindley Miller Garrison Lindley Miller Garrison (November 28, 1864 – October 19, 1932) was an American lawyer from New Jersey who served as Secretary of War under U.S. President Woodrow Wilson between 1913 and 1916. Biography Early years Lindley Miller Garrison ...
, who oversaw the Corps, agreed that a new bridge was necessary in December. Rep.
William C. Adamson William Charles Adamson (August 13, 1854 – January 3, 1929) was a United States representative from Georgia, an Associate Justice of the United States Customs Court and a member of the Board of General Appraisers. Early years and family Adams ...
, chairman of the House Committee on Public Works, challenged Swanson and declared that the new bridge should be placed where the old one was. The Carlin bill began moving through the House in January 1915. But House members balked at the cost. Garrison tried to break the deadlock on January 9 by issuing a report that declared the existing bridge unsafe, and requesting that the new one be built in the same location. The D.C. Commissioners said the location of the bridge was up to them, and the Corps warned that not only could the existing bridge not be enlarged but agreed with Garrison that it was structurally unsound. Swanson changed his mind, and agreed in January 1916 that the new bridge should be built on the existing site. Garrison endorsed the Carlin bill on January 27. On February 3, 1916, vehicular traffic over Aqueduct Bridge was limited by the city to a single automobile at a time due to its dangerous nature. The House passed legislation appropriating $1.175 million for construction of a new bridge on March 6. D.C. commissioners held hearings on the bridge site in late March, and approved the site in early April. The Senate passed some minor amendments to the House bill, and after some legislative discussions and a conference committee, the Carlin bill passed Congress on May 2, 1916. President Woodrow Wilson signed the legislation on May 19.


Construction

On June 1, 1916, the Army Corps of Engineers named the new bridge "Francis Scott Key Bridge," in honor of the man who had written the lyrics to the ''
Star Spangled Banner "The Star-Spangled Banner" is the national anthem of the United States. The lyrics come from the "Defence of Fort M'Henry", a poem written on September 14, 1814, by 35-year-old lawyer and amateur poet Francis Scott Key after witnessing the bo ...
'' whose home was just a few blocks from the bridge's abutment. Plans began to be drawn up at that time. The Classical Revival bridge was designed by
Nathan C. Wyeth Nathan Corwith Wyeth (April 20, 1870 – August 30, 1963) was an American architect. He is best known for designing the West Wing of the White House, creating the first Oval Office. He designed a large number of structures in Washington, D.C., in ...
, an architect in private practice in the city, and Major Max C. Tyler, an engineer with the Army Corps of Engineers. The legislation authorizing the bridge's construction required that the United States Department of War consult with the United States Commission of Fine Arts (CFA) in the design of the bridge. Subsequently, the Chief of Engineers of the Army Corps of Engineers asked the CFA for a list of architects whom the CFA believed would be competent to design an aesthetically pleasing bridge. The CFA swiftly provided a list, and in July 1916 Tyler met with the CFA to discuss a short list of potential architects. The CFA and Tyler also conferred on the bridge's orientation, design, and approaches. Tyler selected Wyeth. The plans were nearly complete by September. Wyeth and Tyler's initial design for the bridge was a double-deck structure with a single, high span. But with World War I erupting in Europe, inflation made this structure too costly. Wyeth then submitted a design for a single-deck, single-span bridge on January 12, 1917. The CFA asked Wyeth to design a multi-span bridge, or, failing that, to construct non-structural decorative elements that would make it look as if the bridge had multiple spans. Wyeth agreed, and the CFA approved the bridge design. In January 1917, the Corps of Engineers found that inflation in the price of construction materials made it necessary to ask for $300,000 more in funding from Congress. Congress balked at paying. But citizen pressure and the danger of Aqueduct Bridge's collapse due to ice flows in the spring convinced Congress to pay the money. Construction contracts were drawn up in late February, and excavation work on the D.C. abutments began in March. The first
coffer dam A cofferdam is an enclosure built within a body of water to allow the enclosed area to be pumped out. This pumping creates a dry working environment so that the work can be carried out safely. Cofferdams are commonly used for construction or re ...
for construction of the piers was sunk in May 1918, and the old Aqueduct Bridge formally closed on July 9. Immense amounts of concrete were needed to construct the bridge. One concrete mixing plant was constructed on the D.C. shore, and concrete was delivered to the worksite in the river by ropeway conveyor. A second mixing plant was constructed in mid-river: The plant was floated into position, and then allowed to sink down to the riverbed. Steel for the reinforced concrete structure and for the steel arches within its spans was assembled on the D.C. shoreline, then floated by barge to the worksite. Progress was slow, as reinforced concrete was a relatively new type of construction. The project ran out of money, and Tyler requested and won an additional $1.1 million from Congress in 1920 to finish the work. The new $2.35 million Key Bridge opened on January 17, 1923. The federal government turned title to the bridge over to the District of Columbia on November 15, 1924. The old Aqueduct Bridge was razed beginning in December 1933. The Aqueduct Bridge's superstructure and most of the above-water portions of its piers were removed in 1933. The bases of the piers were retained to protect the Key Bridge's piers from ice floe damage.


Description

The Key Bridge spans the Potomac River, connecting the Georgetown neighborhood in the District of Columbia with the neighborhood of Rosslyn in Arlington County, Virginia. Key Bridge is Washington's oldest existing road bridge across the Potomac River. The bridge is an open- spandrel, arched structure oriented in a north-south direction and constructed of
reinforced concrete Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having hig ...
and
steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
. Each span consists of three steel arches: A center arch which is in width, and two outer arches each in width. To lighten the load on the span arches, the spandrels were filled with additional arches. Depending on the size of the span, there are either three or four spandrel arches. Together, the span arch and spandrel arches form a truss. The
piers Piers may refer to: * Pier, a raised structure over a body of water * Pier (architecture), an architectural support * Piers (name), a given name and surname (including lists of people with the name) * Piers baronets, two titles, in the baronetages ...
were decorated with pilasters in the
Doric Doric may refer to: * Doric, of or relating to the Dorians of ancient Greece ** Doric Greek, the dialects of the Dorians * Doric order, a style of ancient Greek architecture * Doric mode, a synonym of Dorian mode * Doric dialect (Scotland) * Doric ...
style. The northern terminus of the bridge is just east of the site of Francis Scott Key's home, which was dismantled in the late 1940s. A park honoring Key now occupies the site. The bridge connects with M Street NW, Canal Road NW, and the Whitehurst Freeway (which provides access to K Street NW and
downtown ''Downtown'' is a term primarily used in North America by English speakers to refer to a city's sometimes commercial, cultural and often the historical, political and geographic heart. It is often synonymous with its central business distric ...
). The northbound span has an exit ramp to the eastbound Whitehurst Freeway; however, traffic from the westbound Whitehurst Freeway to the southbound span must use M Street. The southern terminus of the bridge is in the state of Virginia. Northbound traffic accesses the bridge via North Lynn Street, with southbound traffic exits the bridge via North Fort Myer Drive. A cloverleaf ramp from southbound George Washington Memorial Parkway connects to northbound North Lynn Street just before the bridge. Southbound traffic may turn right onto an off-ramp leading to northbound George Washington Memorial Parkway. The bridge's southbound off-ramp connect with north/west-bound U.S. Route 29. Traffic wishing to access southbound Interstate 66 (the Custis Memorial Parkway) must do so by traversing local Rosslyn streets. The bridge originally measured in length, with a roadway above the average water level. The original road deck was wide. It included two wide traffic lanes, a center lane with streetcar tracks, and two wide sidewalks. A horizontal, decorative molding ran along the outer edge of the bridge. It projected outward by . Atop this
cornice In architecture, a cornice (from the Italian ''cornice'' meaning "ledge") is generally any horizontal decorative moulding that crowns a building or furniture element—for example, the cornice over a door or window, around the top edge of a ...
was a paneled parapet. The parapet (or railing) was high and thick. Between each
baluster A baluster is an upright support, often a vertical moulded shaft, square, or lathe-turned form found in stairways, parapets, and other architectural features. In furniture construction it is known as a spindle. Common materials used in its cons ...
of the parapet is a recessed panel. Atop the parapet were
street light A street light, light pole, lamp pole, lamppost, street lamp, light standard, or lamp standard is a raised source of light on the edge of a road or path. Similar lights may be found on a railway platform. When urban electric power distribution ...
s. These were made of cast iron, were tall, and featured a
griffin The griffin, griffon, or gryphon (Ancient Greek: , ''gryps''; Classical Latin: ''grȳps'' or ''grȳpus''; Late Latin, Late and Medieval Latin: ''gryphes'', ''grypho'' etc.; Old French: ''griffon'') is a legendary creature with the body, tail ...
leg and winged shield at the base. The light were spaced apart. The bridge had five arches when constructed. The central arch was long, and the two adjacent arches were long. The shoreward arches were each long. Separate spans completed the approaches to the bridge. The span over the Chesapeake and Ohio Canal in the District of Columbia was either or long (sources vary), while the span over K Street NW was long. The original approach span on the Virginia side was long.


Renovations and alterations


1939 alterations

Francis Scott Key Bridge was significantly altered in 1938 when Congress extended the George Washington Memorial Parkway north along the Virginia shoreline past Key Bridge. A new span over the parkway was added in 1939, giving the bridge an eighth span. Sources vary significantly as to the bridge's new length, with estimates including , , , and .


1955 alterations

Another major alteration to the bridge occurred in 1955. The District of Columbia was transitioning to buses from streetcars, and as part of this change the streetcar tracks over the bridge were torn out. The road deck was widened at this time as well to , which allowed the roadway itself to be widened to . A high
guard rail Guard rail, guardrails, or protective guarding, in general, are a boundary feature and may be a means to prevent or deter access to dangerous or off-limits areas while allowing light and visibility in a greater way than a fence. Common shapes ...
was added between the roadway and the sidewalks, which necessitated narrowing the sidewalks to just . The parapet and original street lights were also removed. A steel railing was added on the external side of the sidewalks, and high "cobrahead" aluminum lampposts were installed every .


1987 alterations

An entirely new roadway deck was installed in 1986-87. The new road deck was a bonded post-tensioned concrete deck in width. The roadway width remained the same, but the extra deck width allowed the sidewalks to be widened to . The 1955 railing was removed, and a precast concrete parapet high with recessed panels between the balusters was installed. The new parapet resembles the 1923 railing. Atop the new parapet is a high steel railing designed to act as a suicide prevention measure. The new steel railing has wide bars set apart. Type 16 Washington Upright Lampposts, each high, were installed above the apex of each arch and atop each pier. On March 1, 1996, the Key Bridge was added to the National Register of Historic Places.


2014 rehabilitation

Key Bridge underwent a major inspection in 2011. Officials were concerned that the chemical agents used to bond the tensioned cables running through the concrete road deck were corroding the concrete. The architectural engineering firm of Johnson, Mirmiran & Thompson (JMT) was hired to inspect the bridge. JMT discovered that the deck slab was ready to fail, and there was extensive corrosive deterioration of the underside of the concrete deck. Cracks were also found in some of the abutments, arches and spandrel arches, concrete deck, and piers. The sonic echo/impulse response method was used to identify areas within the concrete where cables had disintegrated or where corrosion had created voids. JMT restored some deteriorated portions of the deck. The bridge was rated "structurally deficient" after these tests. In 2013, Key Bridge carried approximately 62,000 vehicles each day. '' The Washington Post'' in April 2014 called Key Bridge one of the three "busiest deficient bridges" in the District of Columbia, along with Arlington Memorial Bridge and the connection between Park Road and the
Anacostia Freeway The Anacostia Freeway is a freeway in the U.S. state of Maryland and the District of Columbia. It follows: *Interstate 295 (Maryland–District of Columbia), a spur route connecting I-95 / I-495 and Maryland Route 210 (Indian Head Highway) near the ...
. The District of Columbia Department of Transportation (DDOT) announced a two-year, $21 million rehabilitation of the bridge in April 2014. In addition to repairing the previously-identified structural issues, the street lights were replaced with modern energy-efficient lampposts, the guard rail between the roadway and sidewalks was strengthened, the bridge's drainage system fixed and improved, and the bridge painted.


2016 rehabilitation

A second round of rehabilitation work on Key Bridge was scheduled for fall 2015, although the contract was not announced until October 2015, delaying work about six months. The two-year, $30 million project was intended to replace more street lights with modern fixtures, strengthen the deck overhangs on both sides of the bridge, repair the concrete deck beneath the roadway, repair cracked and broken portions of the concrete superstructure, repair the reinforced concrete beams beneath the concrete deck, improve drainage, and clad the footings of the piers with "fiber-reinforced polymer jackets" to inhibit corrosion. The right lanes of the bridge is being treated with a resin as a test to see if the material will help reduce water infiltration and corrosion. Minor repairs and alterations will also improve pedestrian and bicycle safety on the ramp to the eastbound Whitehurst Freeway. These include removing bollards that narrow the sidewalk, and installing cameras that detect pedestrians and bicycles and will trigger flashing lights on the ramp to warn motorists about their presence. Work began in October 2016 and was to last two years, but was still ongoing in August 2019.


See also

* * * * *
List of bridges documented by the Historic American Engineering Record in Washington, D.C. This is a list of bridges documented by the Historic American Engineering Record in Washington, D.C. Bridges References {{HAER list, structure=bridge *List *List Washington, D.C. Bridges Bridges A bridge is a structure built to Spa ...
* List of bridges on the National Register of Historic Places in Virginia *
List of bridges on the National Register of Historic Places in Washington, D.C. This is a list of bridges on the National Register of Historic Places in Washington, D.C. See also * National Register of Historic Places listings in the District of Columbia * Architecture of Washington, D.C. References

{{NRHP bridges B ...
* National Register of Historic Places listings in Arlington County, Virginia * National Register of Historic Places listings in Washington, D.C. *
Architecture of Washington, D.C. Washington, D.C., the capital of the United States, has a unique and diverse architectural history. Encompassing government, monumental, commercial, and residential buildings, D.C. is home to some of the country's most famous and popular structur ...


References


Bibliography

* * * * * * * * *


External links

* * {{Georgetown, Washington, D.C. Bridges completed in 1923 Road bridges on the National Register of Historic Places in Washington, D.C. Historic American Engineering Record in Washington, D.C. Neoclassical architecture in Washington, D.C. Neoclassical architecture in Virginia Bridges over the Potomac River Georgetown (Washington, D.C.) Road bridges on the National Register of Historic Places in Virginia Transportation in Arlington County, Virginia U.S. Route 29 Buildings and structures in Arlington County, Virginia Bridges of the United States Numbered Highway System National Register of Historic Places in Arlington County, Virginia 1923 establishments in Virginia Concrete bridges in the United States Open-spandrel deck arch bridges in the United States