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134-461: The Big Four Bridge is a six-span truss bridge that crosses the Ohio River , connecting Louisville, Kentucky , and Jeffersonville, Indiana . It was completed in 1895, updated in 1929, taken out of rail service in 1968, and converted to bicycle and pedestrian use in 2013. The largest single span is 547 feet (167 m); the entire bridge spans 2,525 feet (770 m). It took its name from

268-544: A National Historic Landmark , encompasses several examples of neoclassical architecture , including the American Legion , Central Library , and Birch Bayh Federal Building and United States Courthouse . The district is also home to several sculptures and memorials, Depew Memorial Fountain , and open space, hosting many annual civic events. After completion of the Soldiers' and Sailors' Monument , an ordinance

402-470: A Parker truss or Pratt truss than a true arch . In the Brown truss all vertical elements are under tension, with exception of the end posts. This type of truss is particularly suited for timber structures that use iron rods as tension members. See Lenticular truss below. This combines an arch with a truss to form a structure both strong and rigid. Most trusses have the lower chord under tension and

536-693: A U.S. district court was established at Indianapolis in 1825. Growth occurred with the opening of the National Road through the town in 1827, the first major federally funded highway in the United States. A small segment of the ultimately failed Indiana Central Canal was opened in 1839. The first railroad to serve Indianapolis, the Jeffersonville, Madison and Indianapolis Railroad , began operation in 1847, and subsequent railroad connections fostered growth. Indianapolis Union Station

670-411: A caisson that was supposed to hold back the river water flooded, drowning the workers. Another six men died a few months later on May 14, 1890, at 5:10 PM when a wooden beam broke while working on a different pier, Pier Number 4 caisson. The Big Four Bridge had one of the biggest bridge disasters in the United States, occurring on December 15, 1893, at 10:20 AM when a construction crane was dislodged by

804-614: A covered bridge to protect the structure. In 1820, a simple form of truss, Town's lattice truss , was patented, and had the advantage of requiring neither high labor skills nor much metal. Few iron truss bridges were built in the United States before 1850. Truss bridges became a common type of bridge built from the 1870s through the 1930s. Examples of these bridges still remain across the US, but their numbers are dropping rapidly as they are demolished and replaced with new structures. As metal slowly started to replace timber, wrought iron bridges in

938-495: A planned city for the new seat of Indiana's state government. The city was platted by Alexander Ralston and Elias Pym Fordham on a 1-square-mile (2.6 km ) grid. Completion of the National and Michigan roads and later arrival of rail solidified the city's position as a major manufacturing and commercial center. Since the 1970 city-county consolidation , known as Unigov , local government administration operates under

1072-689: A till plain . Elevations across Indianapolis vary from about 650 feet (198 m) to 900 feet (274 m) above mean sea level . Indianapolis is located in the West Fork White River drainage basin , part of the larger Mississippi River watershed via the Wabash and Ohio rivers. The White River flows 31 miles (50 km) north-to-south through the city and is fed by some 35 streams, including Eagle Creek, Fall Creek , Pleasant Run, and Pogue's Run . The city's largest waterbodies are artificial quarry lakes and reservoirs . Indianapolis

1206-421: A Center for Community Progress report, neighborhoods like Cottage Home and Fall Creek Place have experienced measurable gentrification since 2000. The North Meridian Street Historic District is among the most affluent urban neighborhoods in the U.S., with a mean household income of $ 102,599 in 2017. The city of Indianapolis maintains 212 public parks, totaling 11,258 acres (4,556 ha) or about 5.1% of

1340-550: A Parker truss vary from near vertical in the center of the span to diagonal near each end, similar to a Warren truss. George H. Pegram , while the chief engineer of Edge Moor Iron Company in Wilmington, Delaware , patented this truss design in 1885. The Pegram truss consists of a Parker type design with the vertical posts leaning towards the center at an angle between 60 and 75°. The variable post angle and constant chord length allowed steel in existing bridges to be recycled into

1474-420: A block from Monument Circle. The city's address numbering system originates at the intersection of Washington (running east–west) and Meridian streets (running north–south). Beginning construction in 1836, the 8-mile (13 km)-long Indiana Central Canal is the oldest extant artificial facility in the city. Between 1985 and 2001, nearly 1.5 miles (2.4 km) of the former canal in downtown Indianapolis

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1608-454: A center of automobile manufacturing. The city was an early focus of labor organization . The Indianapolis streetcar strike of 1913 and subsequent police mutiny and riots led to the creation of the state's earliest labor-protection laws, including a minimum wage , regular work weeks, and improved working conditions. The International Typographical Union and United Mine Workers of America were among several influential labor unions based in

1742-594: A continuous truss functions as a single rigid structure over multiple supports. This means that the live load on one span is partially supported by the other spans, and consequently it is possible to use less material in the truss. Continuous truss bridges were not very common before the mid-20th century because they are statically indeterminate , which makes them difficult to design without the use of computers . A multi-span truss bridge may also be constructed using cantilever spans, which are supported at only one end rather than both ends like other types of trusses. Unlike

1876-523: A continuous truss, a cantilever truss does not need to be connected rigidly, or indeed at all, at the center. Many cantilever bridges, like the Quebec Bridge shown below, have two cantilever spans supporting a simple truss in the center. The bridge would remain standing if the simple truss section were removed. Bridges are the most widely known examples of truss use. There are many types, some of them dating back hundreds of years. Below are some of

2010-435: A conventional truss into place or by building it in place using a "traveling support". In another method of construction, one outboard half of each balanced truss is built upon temporary falsework. When the outboard halves are completed and anchored the inboard halves may then be constructed and the center section completed as described above. The Fink truss was designed by Albert Fink of Germany in 1854. This type of bridge

2144-605: A lack of durability, and gave way to the Pratt truss design, which was stronger. Again, the bridge companies marketed their designs, with the Wrought Iron Bridge Company in the lead. As the 1880s and 1890s progressed, steel began to replace wrought iron as the preferred material. Other truss designs were used during this time, including the camel-back. By the 1910s, many states developed standard plan truss bridges, including steel Warren pony truss bridges. In

2278-531: A large proportion of the early Irish and German immigrants were Catholics . Few African Americans lived in central Indiana before 1840. The first European Americans to permanently settle in the area that became Indianapolis were either the McCormick or Pogue families. The McCormicks are generally considered to be the first permanent settlers; however, some historians believe George Pogue and family may have arrived first, on March 2, 1819, and settled in

2412-634: A log cabin along the creek that was later called Pogue's Run . Other historians have argued as early as 1822 that John Wesley McCormick and his family and employees became the area's first European American settlers, settling near the White River in February 1820. On January 11, 1820, the Indiana General Assembly authorized a committee to select a site in central Indiana for the new state capital. The state legislature approved

2546-477: A lower chord (functioning as a suspension cable) that curves down and then up to meet at the same end points. Where the arches extend above and below the roadbed, it is called a lenticular pony truss bridge . The Pauli truss bridge is a specific variant of the lenticular truss, but the terms are not interchangeable. One type of lenticular truss consists of arcuate upper compression chords and lower eyebar chain tension links. Brunel 's Royal Albert Bridge over

2680-726: A new span using the Pegram truss design. This design also facilitated reassembly and permitted a bridge to be adjusted to fit different span lengths. There are twelve known remaining Pegram span bridges in the United States with seven in Idaho , two in Kansas , and one each in California , Washington , and Utah . The Pennsylvania (Petit) truss is a variation on the Pratt truss . The Pratt truss includes braced diagonal members in all panels;

2814-458: A political upset. The Ballard administration oversaw the lease of the city's parking meters and the sale of the city's water and wastewater utilities with proceeds financing street repairs. Ballard pursued several environmental sustainability efforts, including establishing an office of sustainability, installing 200 miles (320 km) of bike lanes and trails, and spearheading a controversial deal to start an electric carsharing program. Two of

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2948-520: A population of more than 2.6 million, the combined statistical area ranks 27th . Indianapolis proper covers 368 square miles (950 km ), making it the 19th-most extensive city by land area in the country. Indigenous peoples inhabited the area dating to as early as 10,000 BC. In 1818, the Lenape relinquished their tribal lands in the Treaty of St. Mary's . In 1821, Indianapolis was established as

3082-680: A result of the city's expansive land area, Indianapolis has a unique urban-to-rural transect , ranging from dense urban neighborhoods to suburban tract housing subdivisions, to rural villages. Typical of American cities in the Midwest, Indianapolis urbanized in the late 19th and early 20th centuries, resulting in the development of relatively dense, well-defined neighborhoods clustered around streetcar corridors, especially in Center Township . Notable streetcar suburbs include Broad Ripple , Irvington , and University Heights . Starting in

3216-468: A result, falsework was longitudely reinforced to prevent further occurrences, and also to prevent strong winds from causing similar damage by using special bracing on the bottom frame of the truss. Also, a new rule was enforced: "never trust a bolted joint any longer than is necessary to put a riveted one in place". The Big Four Bridge was finally completed in September 1895. Due to the various accidents,

3350-489: A severe wind, causing the falsework support of a truss to be damaged and the truss—with forty-one workers on it—to fall into the Ohio River. Twenty of the workers survived, but 21 died. The accident almost cost more lives, as a ferry crossing the Ohio River just barely missed being hit by the truss. Hours later, a span next to the damaged span also fell into the river, but was unoccupied at the time, causing no injuries. As

3484-606: A stop at Indianapolis, where an estimated crowd of more than 100,000 people passed the assassinated president's bier at the Indiana Statehouse . Following the Civil War and in the wake of the Second Industrial Revolution , Indianapolis experienced tremendous growth and prosperity. In 1880, Indianapolis was the world's third-largest pork packing city, after Chicago and Cincinnati , and

3618-445: A strike; before the collapse, similar incidents had been common and had necessitated frequent repairs. Truss bridges consisting of more than one span may be either a continuous truss or a series of simple trusses. In the simple truss design, each span is supported only at the ends and is fully independent of any adjacent spans. Each span must fully support the weight of any vehicles traveling over it (the live load ). In contrast,

3752-518: A system of parkways following the city's waterways. The system's 3,474 acres (1,406 ha) were added to the National Register of Historic Places in 2003. Marion County is also home to parks managed by the State of Indiana, including Fort Harrison State Park and White River State Park . Established in 1996, Fort Harrison State Park covers 1,744 acres (706 ha) that are overseen by

3886-473: A town of 1 square mile (2.6 km ), near the confluence of the White River and Fall Creek . Known as the Mile Square, the plan followed a grid pattern centered on a traffic circle called Monument Circle , from which Indianapolis's "Circle City" nickname originates. Four diagonal avenues— Indiana (northwest), Kentucky (southwest), Massachusetts (northeast), and Virginia (southwest)—radiated

4020-545: A variant of the lenticular truss, "with the top chord carefully shaped so that it has a constant force along the entire length of the truss." It is named after Friedrich Augustus von Pauli  [ de ] , whose 1857 railway bridge (the Großhesseloher Brücke  [ de ] ) spanned the Isar near Munich . ( See also Grosshesselohe Isartal station .) The term Pauli truss is not interchangeable with

4154-430: Is 42.4 inches (108 cm). Snowfall averages 25.9 inches (66 cm) per season. Official temperature extremes range from 106 °F (41 °C), set on July 14, 1936 , to −27 °F (−33 °C), set on January 19, 1994 . The U.S. Census Bureau considers Indianapolis as two entities: the consolidated city and the city's remainder, or balance . The consolidated city is coterminous with Marion County , except

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4288-492: Is a planned city . On January 11, 1820, the Indiana General Assembly authorized a committee to select a site in central Indiana for the new state capital, appointing Alexander Ralston and Elias Pym Fordham to survey and design a town plan for Indianapolis. Ralston had been a surveyor for the French architect Pierre L'Enfant , assisting him with the plan for Washington, D.C. Ralston's original plan for Indianapolis called for

4422-700: Is a Pratt truss design with a polygonal upper chord. A "camelback" is a subset of the Parker type, where the upper chord consists of exactly five segments. An example of a Parker truss is the Traffic Bridge in Saskatoon , Canada. An example of a camelback truss is the Woolsey Bridge near Woolsey, Arkansas . Designed and patented in 1872 by Reuben Partridge , after local bridge designs proved ineffective against road traffic and heavy rains. It became

4556-519: Is a hybrid between a Warren truss and a double-intersection Pratt truss. Invented in 1863 by Simeon S. Post, it is occasionally referred to as a Post patent truss although he never received a patent for it. The Ponakin Bridge and the Bell Ford Bridge are two examples of this truss. A Pratt truss includes vertical members and diagonals that slope down towards the center, the opposite of

4690-415: Is a six-span bridge, totaling 2,525 feet (770 m) long, with a clearance of 53 feet (16 m). The northernmost span is a riveted , eight-panel Parker through truss . The next three spans are 547 feet (167 m) long, and are riveted, 16-panel Pennsylvania through trusses. The two southern spans are riveted, 10-panel Parker through trusses. It carried a single track of railway. The Big Four Bridge

4824-521: Is home to two major league sports teams, three Fortune 500 companies, eight university campuses, and numerous cultural institutions, including the world's largest children's museum . The city is perhaps best known for hosting the world's largest single-day sporting event, the Indianapolis 500 . Among the city's historic sites and districts , Indianapolis is home to the largest collection of monuments dedicated to veterans and war casualties in

4958-597: Is land and 6.3 square miles (16 km ) is water. It is the 19th-most extensive city by land area in the U.S. As a consolidated city-county , Indianapolis's city limits are coterminous with Marion County , except the autonomous and semi-autonomous municipalities outlined in Unigov . Nine civil townships form the broadest geographic divisions within the city and county; these are Center , Decatur , Franklin , Lawrence , Perry , Pike , Warren , Washington , and Wayne townships. The consolidated city-county borders

5092-832: Is named after the K formed in each panel by the vertical member and two oblique members. Examples include the Südbrücke rail bridge over the River Rhine, Mainz, Germany, the bridge on I-895 (Baltimore Harbor Tunnel Thruway) in Baltimore, Maryland, the Long–Allen Bridge in Morgan City, Louisiana (Morgan City Bridge) with three 600-foot-long spans, and the Wax Lake Outlet bridge in Calumet, Louisiana One of

5226-695: Is practical for use with spans up to 250 feet (76 m) and was a common configuration for railroad bridges as truss bridges moved from wood to metal. They are statically determinate bridges, which lend themselves well to long spans. They were common in the United States between 1844 and the early 20th century. Examples of Pratt truss bridges are the Governor's Bridge in Maryland ; the Hayden RR Bridge in Springfield, Oregon , built in 1882;

5360-411: Is situated 98 miles (158 km) northwest of Cincinnati, Ohio , 107 miles (172 km) north of Louisville, Kentucky , 164 miles (264 km) southeast of Chicago, Illinois , and 168 miles (270 km) west of Columbus, Ohio . According to the U.S. Census Bureau , the Indianapolis (balance) encompasses a total area of 367.9 square miles (953 km ), of which 361.6 square miles (937 km )

5494-525: Is the Victoria Bridge on Prince Street, Picton, New South Wales . Also constructed of ironbark, the bridge is still in use today for pedestrian and light traffic. The Bailey truss was designed by the British in 1940–1941 for military uses during World War II. A short selection of prefabricated modular components could be easily and speedily combined on land in various configurations to adapt to

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5628-404: Is the capital and most populous city of the U.S. state of Indiana and the seat of Marion County . Indianapolis is situated in the state's central till plain region along the west fork of the White River . The city's official slogan, " Crossroads of America ", reflects its historic importance as a transportation hub and its relative proximity to other major North American markets. At

5762-746: Is unique in that it contains some 200 farms covering thousands of acres of agricultural land within its municipal boundaries. Equestrian farms and corn and soybean fields interspersed with suburban development are commonplace on the city's periphery, especially in Franklin Township . Noted as one of the finest examples of the City Beautiful movement design in the U.S., the Indiana World War Memorial Plaza Historic District began construction in 1921 in downtown Indianapolis. The district,

5896-611: Is used in the teaching of statics, by the building of model bridges from spaghetti . Spaghetti is brittle and although it can carry a modest tension force, it breaks easily if bent. A model spaghetti bridge thus demonstrates the use of a truss structure to produce a usefully strong complete structure from individually weak elements. In the United States , because wood was in abundance, early truss bridges would typically use carefully fitted timbers for members taking compression and iron rods for tension members , usually constructed as

6030-497: The 2020 census , the balance population was 887,642. Indianapolis is the 16th-most populous city in the U.S., the third-most populous city in the Midwest after Chicago and Columbus, Ohio , and the fourth-most populous state capital in the nation after Phoenix , Austin , and Columbus. The Indianapolis metropolitan area is the 34th-most populous metropolitan statistical area in the U.S., home to 2.1 million residents. With

6164-598: The City-County Building was the first high-rise in the city to surpass the Soldiers' and Sailors' Monument in height. A building boom , lasting from 1982 to 1990, saw the construction of six of the city's ten tallest buildings. The tallest is Salesforce Tower , completed in 1990 at 811 ft (247 m). Indiana limestone is the signature building material in Indianapolis, widely included in

6298-621: The Dearborn River High Bridge near Augusta, Montana, built in 1897; and the Fair Oaks Bridge in Fair Oaks, California , built 1907–09. The Scenic Bridge near Tarkio, Montana , is an example of a Pratt deck truss bridge, where the roadway is on top of the truss. The queenpost truss , sometimes called "queen post" or queenspost, is similar to a king post truss in that the outer supports are angled towards

6432-1316: The Fort Wayne Street Bridge in Goshen, Indiana , the Schell Bridge in Northfield, Massachusetts , the Inclined Plane Bridge in Johnstown, Pennsylvania , the Easton–Phillipsburg Toll Bridge in Easton, Pennsylvania , the Connecticut River Bridge in Brattleboro, Vermont , the Metropolis Bridge in Metropolis, Illinois , and the Healdsburg Memorial Bridge in Healdsburg, California . A Post truss

6566-767: The George Floyd protests in Indiana prompted a series of local police reforms and renewed efforts to bolster social services for mental health treatment and homelessness. In 2021, a mass shooting occurred at a FedEx facility on the city's southwest side, killing nine (including the gunman) and injuring seven others. Indianapolis is located in the East North Central region of the Midwestern United States , about 14 miles (23 km) south-southeast of Indiana's geographic center . It

6700-495: The Howe truss . The interior diagonals are under tension under balanced loading and vertical elements under compression. If pure tension elements (such as eyebars ) are used in the diagonals, then crossing elements may be needed near the center to accept concentrated live loads as they traverse the span. It can be subdivided, creating Y- and K-shaped patterns. The Pratt truss was invented in 1844 by Thomas and Caleb Pratt. This truss

6834-654: The Indiana Department of Natural Resources . Since 1979, White River has been owned and operated by the White River State Park Development Commission, a quasi-governmental agency. White River's 250 acres (100 ha) are home to several attractions, including the Indianapolis Zoo and White River Gardens . Two land trusts are active in the city managing several sites for nature conservation throughout

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6968-486: The Louisville Waterfront Park near the bridge, which took place from late 2015 to early 2016. Improvements included additional landscaping, a new path west from the ramp, and a plaza underneath the bridge. Between its closing as a rail bridge and its reopening as a pedestrian span, the bridge has seen occasional fires; two in the 1970s, one in 1987 and one in 2008. In 1987 Christmas lights posted on

7102-493: The Mississippi Flyway , the city sees more than 400 migratory bird species throughout the year. Some 57 species of fish can be found in the city's waterways, including bass and sunfish . Some federally-designated endangered and threatened species are native to the Indianapolis area, including several species of freshwater mussels , the rusty patched bumble bee , Indiana bat , northern long-eared bat , and

7236-481: The River Tamar between Devon and Cornwall uses a single tubular upper chord. As the horizontal tension and compression forces are balanced these horizontal forces are not transferred to the supporting pylons (as is the case with most arch types). This in turn enables the truss to be fabricated on the ground and then to be raised by jacking as supporting masonry pylons are constructed. This truss has been used in

7370-399: The analysis of its structure using a few assumptions and the application of Newton's laws of motion according to the branch of physics known as statics . For purposes of analysis, trusses are assumed to be pin jointed where the straight components meet, meaning that taken alone, every joint on the structure is functionally considered to be a flexible joint as opposed to a rigid joint with

7504-511: The decidious forests that once covered 98% of the region were cleared for agriculture and urban development , contributing to considerable habitat loss . Indianapolis's current urban tree canopy averages approximately 33%. A rare example of old-growth forest in the city can be found on 15 acres (6.1 ha) of Crown Hill Cemetery 's North Woods in the Butler–Tarkington neighborhood. The cemetery's 555 acres (225 ha) represents

7638-530: The running buffalo clover . In recent years, the National Wildlife Federation has ranked Indianapolis among the ten most wildlife-friendly cities in the U.S. Indianapolis has a hot-summer humid continental climate ( Köppen climate classification : Dfa ), but can be considered a borderline humid subtropical climate ( Köppen : Cfa ) using the −3 °C (27 °F) isotherm. It experiences four distinct seasons. The city lies at

7772-412: The 1920s and 1930s, Pennsylvania and several states continued to build steel truss bridges, using massive steel through-truss bridges for long spans. Other states, such as Michigan , used standard plan concrete girder and beam bridges, and only a limited number of truss bridges were built. The truss may carry its roadbed on top, in the middle, or at the bottom of the truss. Bridges with the roadbed at

7906-516: The 1970s and 1980s, local radio station WLRS -FM lit up the Big Four Bridge as part of their "Bridge the Gap" Christmas promotion, which was used as a fund raiser for needy local families. Some of the lights spelled out "LRS 102". After unsuccessful litigation to stop the project, the Big Four Bridge was converted into a pedestrian and bicycle bridge as part of Louisville Waterfront Park and

8040-417: The 1990s, including the openings of Circle Centre Mall , Victory Field , and Gainbridge Fieldhouse , as well as ongoing redevelopment of the Indiana Central Canal and White River State Park areas. Bart Peterson took office in 2000, the first Democrat elected to the post since John J. Barton 's 1963 election . The Peterson administration focused on education reform and promoting the arts. In 2001,

8174-462: The City of Jeffersonville would provide $ 2 million in matching dollars to pay for construction of a ramp to the Big Four Bridge. Kentucky pledged $ 12 million to replace the deck on the bridge and connect it to the spiral ramp that was completed in Waterfront Park . On February 7, 2013, the Louisville ramp was opened for pedestrian and bicycle traffic. Initially planned for August 2013, the Jeffersonville ramp opened on May 20, 2014. The Big Four Bridge

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8308-518: The Indianapolis area include mammals such as the white-tailed deer , eastern chipmunk , eastern cottontail , and the eastern grey and American red squirrels . In recent years, local raccoon and groundhog populations have increased alongside sightings of American badgers , beavers , mink , coyotes , and red fox . Birds native to the area include the northern cardinal , wood thrush , eastern screech owl , mourning dove , pileated and red-bellied woodpeckers , and wild turkey . Located in

8442-435: The Kentucky side, which has computer-controlled lights that can show various colors. The Indiana construction also had to be cautious of historic properties. During Thunder Over Louisville, the Big Four Bridge sets the limit on how close private boats can get to the fireworks, which are centered three bridges away on the George Rogers Clark Memorial Bridge. The Waterfront Development Corporation spent $ 500,000 in upgrades to

8576-468: The Klan. While campaigning in the city in 1968, Robert F. Kennedy delivered one of the most lauded speeches in 20th century American history, following the assassination of civil rights leader Martin Luther King Jr. As in most U.S. cities during the Civil Rights Movement , the city experienced strained race relations. A 1971 federal court decision forcing Indianapolis Public Schools to implement desegregation busing proved controversial. During

8710-455: The Louisville and Jeffersonville Bridge Company was financially strapped after building the bridge, and later in 1895 sold it to the Indianapolis -based Cleveland, Cincinnati, Chicago and St. Louis Railway , also known as the Big Four Railroad. This gave the railway its first entry into the Louisville market, although the railroad would have likely used the bridge even if they had not bought it, as they desired access to Louisville. One effect of

8844-405: The Ohio , but the United States Army Corps of Engineers approved the building site, even after the vocal protestations. Construction began on October 10, 1888. The Big Four Bridge would be the only Louisville bridge with serious accidents during its building; 37 individuals died during its construction. The first 14 died on January 9, 1890, at 5:40 PM while working on Pier Number 5 foundation when

8978-427: The Pennsylvania truss adds to this design half-length struts or ties in the top, bottom, or both parts of the panels. It is named after the Pennsylvania Railroad , which pioneered this design. It was once used for hundreds of bridges in the United States, but fell out of favor in the 1930s and very few examples of this design remain. Examples of this truss type include the Lower Trenton Bridge in Trenton, New Jersey ,

9112-407: The U.S. outside of Washington, D.C. The name Indianapolis is derived from pairing the state's name, Indiana (meaning "Land of the Indians", or simply "Indian Land" ), with the suffix -polis , the Greek word for "city". Jeremiah Sullivan , justice of the Indiana Supreme Court , is credited with coining the name. Other names considered were Concord, Suwarrow, and Tecumseh . In 1816,

9246-399: The US started being built on a large scale in the 1870s. Bowstring truss bridges were a common truss design during this time, with their arched top chords. Companies like the Massillon Bridge Company of Massillon, Ohio , and the King Bridge Company of Cleveland , became well-known, as they marketed their designs to cities and townships. The bowstring truss design fell out of favor due to

9380-440: The adjacent counties of Boone to the northwest; Hamilton to the north; Hancock to the east; Shelby to the southeast; Johnson to the south; Morgan to the southwest; and Hendricks to the west. Between 2.6 million and 11,700 years ago, the Indianapolis area was situated on the southern margin of the Laurentide Ice Sheet . The erosive advance and retreat of glacial ice produced a flat or gently sloping landscape, known as

9514-406: The age and condition of the bridge; the wood trusses on the bridge were unsafe for firefighters to scale, due to the fire on the bridge ten years before. Louisville Fire & Rescue chief Greg Frederick decided that firefighters were not to be sent onto the bridge; a boat from the Harrods Creek Fire Department was used to put out the fire, as Louisville's fire boat did not have a hose that could reach

9648-454: The balance between labor, machinery, and material costs has certain favorable proportions. The inclusion of the elements shown is largely an engineering decision based upon economics, being a balance between the costs of raw materials, off-site fabrication, component transportation, on-site erection, the availability of machinery, and the cost of labor. In other cases, the appearance of the structure may take on greater importance and so influence

9782-456: The blaze on the bridge. It took two and a half hours to control the fire. Navigation lights used for the heavy barge traffic were being changed at the time of the report. The Coast Guard shut down river traffic for about a mile around the bridge due to falling debris. An official determination on the cause of the fire was expected in June 2008. Truss bridge The nature of a truss allows

9916-425: The bridge illustrated in the infobox at the top, vertical members are in tension, lower horizontal members in tension, shear , and bending, outer diagonal and top members are in compression, while the inner diagonals are in tension. The central vertical member stabilizes the upper compression member, preventing it from buckling . If the top member is sufficiently stiff then this vertical element may be eliminated. If

10050-509: The bridge on March 10, 1968. The Big Four Bridge's former traffic was then routed over Louisville's Fourteenth Street Bridge . From July 26, 1974, to January 1975, both approach spans were removed by the Detzel Construction Company of Cincinnati, Ohio, and were sold for scrap. As a result, the Big Four Bridge became the first Louisville bridge to fall out of use, and gained the nickname "Bridge That Goes Nowhere". During

10184-675: The bridge to dismantle it and reassemble in Costa Rica , as he believed it would be cheaper to import the bridge than build a new one. At the time the city did not actually own the bridge, and the plan never went through. The Big Four Bridge fell into disuse after the Big Four Railroad's parent company, the New York Central Railroad , was merged into the Penn Central in 1968. The last train ran across

10318-542: The bridge to promote a toy drive started the fire; both the Jeffersonville and Louisville fire departments fought six to eight hours to put out the blaze. On May 7, 2008, the bridge caught fire a quarter mile (400 m) north of the Louisville end, shortly after noon, 70 to 80 feet (21 to 24 m) above the Ohio River; suspected to have started from an electrical problem. This fire was more troublesome due to

10452-593: The center of the structure. The primary difference is the horizontal extension at the center which relies on beam action to provide mechanical stability. This truss style is only suitable for relatively short spans. The Smith truss , patented by Robert W Smith on July 16, 1867, has mostly diagonal criss-crossed supports. Smith's company used many variations of this pattern in the wooden covered bridges it built. Indianapolis Indianapolis ( / ˌ ɪ n d i ə ˈ n æ p ə l ɪ s / IN -dee-ə- NAP -ə-lis ), colloquially known as Indy ,

10586-732: The center, the opposite of the Pratt truss . In contrast to the Pratt truss, the diagonal web members are in compression and the vertical web members are in tension. Few of these bridges remain standing. Examples include Jay Bridge in Jay, New York ; McConnell's Mill Covered Bridge in Slippery Rock Township, Lawrence County, Pennsylvania ; Sandy Creek Covered Bridge in Jefferson County, Missouri ; and Westham Island Bridge in Delta, British Columbia , Canada. The K-truss

10720-423: The city's first mayor, led the new city government, which included a seven-member city council. In 1853, voters approved a new city charter that provided for an elected mayor and a fourteen-member city council. The city charter continued to be revised as Indianapolis expanded. Effective January 1, 1825, the seat of state government moved to Indianapolis from Corydon, Indiana . In addition to state government offices,

10854-489: The city's land area by more than 300 square miles (780 km ) and increased its population by some 250,000 people. It was the first major city-county consolidation to occur in the U.S. without a referendum since the creation of the City of Greater New York in 1898. Lugar is credited with initiating downtown revitalization efforts, overseeing the building of Market Square Arena , renovations to Indianapolis City Market , and

10988-561: The city's land area. Eagle Creek Park , Indianapolis's largest and most visited park, ranks among the largest municipal parks in the U.S., covering 4,766 acres (1,929 ha). Garfield Park , the city's first municipal park, opened in 1876 as Southern Park. In the early 20th century, the city enlisted landscape architect George Kessler to conceive a framework for Indianapolis's modern parks system. Kessler's 1909 Indianapolis Park and Boulevard Plan linked notable parks, such as Brookside , Ellenberger , Garfield, and Riverside , with

11122-713: The city's largest capital projects, the Indianapolis International Airport 's new terminal and Lucas Oil Stadium , were completed in 2008. In 2012, construction began on a $ 2 billion tunnel system designed to reduce sewage overflows into the city's waterways. Since 2016, the administration of Joe Hogsett has focused on addressing a rise in gun violence and the city's racial disparities. In recent years, significant capital and operational investments have been made in public safety, criminal justice, and public transit. The city also established rental assistance and food security programs. In 2020,

11256-431: The city's many monuments, churches, academic, government, and civic buildings. For statistical purposes, the consolidated city-county is organized into 99 "neighborhood areas" with most containing numerous individual historic and cultural districts, subdivisions, and some semi-autonomous towns. In total, some 500 self-identified neighborhood associations are listed in the city's Registered Community Organization system. As

11390-667: The city's population more than doubled. An estimated 4,000 men from Indianapolis served in 39 regiments, and an estimated 700 died during the war. On May 20, 1863, Union soldiers attempted to disrupt a statewide Democratic convention at Indianapolis, forcing an adjournment of the proceedings, sarcastically referred to as the Battle of Pogue's Run . Fear turned to panic in July 1863, during Morgan's Raid into southern Indiana, but Confederate forces turned east toward Ohio , never reaching Indianapolis. On April 30, 1865, Lincoln's funeral train made

11524-856: The city. As a stop on the Underground Railroad , Indianapolis had one of the largest black populations in the Northern States , until the Great Migration . Led by D. C. Stephenson , the Indiana Klan became the most powerful political and social organization in Indianapolis from 1921 through 1928, controlling the City Council and the Board of School Commissioners, among others. At its height, more than 40% of native-born white males in Indianapolis claimed membership in

11658-414: The compression members and to control deflection. It is mainly used for rail bridges, showing off a simple and very strong design. In the Pratt truss the intersection of the verticals and the lower horizontal tension members are used to anchor the supports for the short-span girders under the tracks (among other things). With the Baltimore truss, there are almost twice as many points for this to happen because

11792-600: The construction of a stadium, with the upper chords of parallel trusses supporting a roof that may be rolled back. The Smithfield Street Bridge in Pittsburgh, Pennsylvania , is another example of this type. An example of a lenticular pony truss bridge that uses regular spans of iron is the Turn-of-River Bridge designed and manufactured by the Berlin Iron Bridge Co. The Pauli truss is

11926-581: The defunct Cleveland, Cincinnati, Chicago and St. Louis Railway , which was nicknamed the "Big Four Railroad". Access to the Big Four Bridge is limited to pedestrian and bicycle use. A pedestrian ramp on the Kentucky side was opened on February 7, 2013. The original approaches that carried rail traffic onto the main spans were first removed in 1974–1975, earning the Big Four Bridge the nickname "Bridge That Goes Nowhere". The George Rogers Clark Memorial Bridge downstream, which carries U.S. Route 31 across

12060-429: The design decisions beyond mere matters of economics. Modern materials such as prestressed concrete and fabrication methods, such as automated welding , and the changing price of steel relative to that of labor have significantly influenced the design of modern bridges. A pure truss can be represented as a pin-jointed structure, one where the only forces on the truss members are tension or compression, not bending. This

12194-453: The direction of an elected 25-member city-county council headed by the mayor . Indianapolis anchors the 29th largest metropolitan economy in the U.S. Prominent industries include trade, transportation, and utilities; education and health services; professional and business services; government; leisure and hospitality; and manufacturing. The city has notable niche markets in amateur sports and auto racing . Contemporary Indianapolis

12328-484: The earliest examples is the Old Blenheim Bridge , which with a span of 210 feet (64 m) and a total length of 232 feet (71 m) long was the second-longest covered bridge in the United States, until its destruction from flooding in 2011. The Busching bridge, often erroneously used as an example of a Long truss, is an example of a Howe truss, as the verticals are metal rods. A Parker truss bridge

12462-567: The falsework was entirely removed. During construction, the Big Four Bridge's usual rail traffic was routed over the Kentucky & Indiana Terminal Bridge . The interurbans that used the Big Four Bridge would instead disembark at Sellersburg, Indiana , and have the passengers board buses into Louisville for the duration of the Big Four's reconstruction. In 1961 the John F. Kennedy Memorial Bridge

12596-490: The first visit from a president-elect in the city's history. On April 16, 1861, the first orders were issued to form Indiana's first regiments and establish Indianapolis as a headquarters for the state's volunteer soldiers. Within a week, more than 12,000 recruits signed up to fight for the Union. Indianapolis became a major logistics hub during the war, establishing the city as a crucial military base. Between 1860 and 1870,

12730-538: The formation of Indiana University–Purdue University Indianapolis . Amid the changes in government and growth, the city pursued an aggressive economic development strategy to raise the city's stature as a sports tourism destination, known as the Indianapolis Project. During the administration of the city's longest-serving mayor, William Hudnut (1976–1992), millions of dollars were invested into sports venues and public relations campaigns. The strategy

12864-404: The increasing weight of the rail traffic, contracts were finalized in June 1928 to build a bigger Big Four Bridge, which opened on June 25, 1929. The new Big Four Bridge was built on the piers of the old bridge, a "novel building process", as it sped up the time necessary to build the new bridge; the old one served to reinforce the new one as it was being built. The old piers would still be used, but

12998-430: The independent municipalities of Beech Grove , Lawrence , Southport , and Speedway . The city's balance excludes the populations of ten semi-autonomous municipalities that are included in totals for the consolidated city. These are Clermont , Crows Nest , Homecroft , Meridian Hills , North Crows Nest , Rocky Ripple , Spring Hill , Warren Park , Williams Creek , and Wynnedale . An eleventh town, Cumberland ,

13132-456: The largest green space in Center Township , home to an abundance of wildlife and some 130 species of trees. Native trees most common to the area include varieties of ash , maple , and oak . Several invasive species are also common in Indianapolis, including tree of heaven , wintercreeper , Amur honeysuckle , and Callery pear . A 2016 bioblitz along three of the city's riparian corridors found 590 taxa . Urban wildlife common to

13266-482: The lower chord (a horizontal member of a truss) is sufficiently resistant to bending and shear, the outer vertical elements may be eliminated, but with additional strength added to other members in compensation. The ability to distribute the forces in various ways has led to a large variety of truss bridge types. Some types may be more advantageous when the wood is employed for compression elements while other types may be easier to erect in particular site conditions, or when

13400-604: The mayor's office became the first in the U.S. to authorize charter schools . Indianapolis Cultural Districts were designated in 2003, followed by the groundbreaking of the Indianapolis Cultural Trail in 2007. Further consolidation of city and county units of government resulted in the establishment of the Indianapolis Metropolitan Police Department in 2007. Later that year, Greg Ballard succeeded Peterson in

13534-434: The mayoral administration of Richard Lugar (1968–1976), the city and county governments consolidated. Known as Unigov (a portmanteau of "unified" and "government"), the city-county consolidation removed bureaucratic redundancies, captured increasingly suburbanizing tax revenue, and created a Republican political machine that dominated local politics until the early 2000s. Effective January 1, 1970, Unigov expanded

13668-713: The mid-20th century, the post–World War II economic expansion and subsequent suburbanization greatly influenced the city's development patterns. From 1950 to 1970, nearly 100,000 housing units were built in Marion County, most outside Center Township in suburban neighborhoods such as Castleton , Eagledale , and Nora . Since the 2000s, downtown Indianapolis and surrounding neighborhoods have seen increased reinvestment mirroring nationwide market trends, driven by empty nesters and millennials . Renewed interest in urban living has been met with some dispute regarding gentrification and affordable housing . According to

13802-515: The more common designs. The Allan truss , designed by Percy Allan , is partly based on the Howe truss . The first Allan truss was completed on 13 August 1894 over Glennies Creek at Camberwell, New South Wales and the last Allan truss bridge was built over Mill Creek near Wisemans Ferry in 1929. Completed in March 1895, the Tharwa Bridge located at Tharwa, Australian Capital Territory ,

13936-412: The needs at the site and allow rapid deployment of completed trusses. In the image, note the use of pairs of doubled trusses to adapt to the span and load requirements. In other applications the trusses may be stacked vertically, and doubled as necessary. The Baltimore truss is a subclass of the Pratt truss. A Baltimore truss has additional bracing in the lower section of the truss to prevent buckling in

14070-614: The new state capital in 1820. The indigenous people of the land prior to systematic removal are the Miami Nation of Indiana ( Miami Nation of Oklahoma ) and Indianapolis makes up part of Cession 99; the primary treaty between the indigenous population and the United States was the Treaty of St. Mary's (1818) . The availability of new federal lands for purchase in central Indiana attracted settlers, many of them descendants of families from northwestern Europe. Although many of these first European and American settlers were Protestants ,

14204-427: The ongoing revitalization of the Louisville riverfront. This conversion had been proposed and planned since the 1990s. In February 2013, pedestrians were allowed to access the completed bridge from the ramp on the Kentucky side. The Indiana ramp opened on May 20, 2014. Lighting along the bridge is required for safety and had been redesigned to please nearby residents. Originally, the lighting was to be similar to that on

14338-438: The opening of the Big Four Bridge was increased transportation of freight by rail, significantly decreasing the number of packet boats that at one time crossed the Ohio River by the dozens. On February 19, 1904, a Baltimore and Ohio train accidentally crossed the Big Four Bridge, because engineer Dick Foreman fell asleep and went the wrong way at Otisco, Indiana . The fireman kept shoveling coal and did not pay attention. It

14472-650: The region. Indianapolis is situated in the Southern Great Lakes forests ecoregion which in turn is located within the larger temperate broadleaf and mixed forests biome , as defined by the World Wide Fund for Nature . Based on the U.S. Environmental Protection Agency 's alternative classification system , the city is located in the Eastern Corn Belt Plains , an area of the country known for its fertile soil. Much of

14606-553: The river, was previously the only bridge allowing bicyclists and pedestrians to travel between Louisville and the neighboring Indiana cities of New Albany , Clarksville , and Jeffersonville. In February 2011, Kentucky and Indiana announced that the two states, along with the City of Jeffersonville, would allocate $ 22 million in funding to complete the Big Four Bridge project, creating a pedestrian and bicycle path to link Louisville and Jeffersonville. Indiana would spend up to $ 8 million and

14740-474: The roadbed but are not connected, a pony truss or half-through truss. Sometimes both the upper and lower chords support roadbeds, forming a double-decked truss . This can be used to separate rail from road traffic or to separate the two directions of road traffic. Since through truss bridges have supports located over the bridge deck, they are susceptible to being hit by overheight loads when used on highways. The I-5 Skagit River bridge collapsed after such

14874-461: The second-largest railroad center in the U.S. by 1888. By 1890, the city's population surpassed 100,000. Some of the city's most notable businesses were founded during this period of growth and innovation, including L. S. Ayres (1872), Eli Lilly and Company (1876), Madam C. J. Walker Manufacturing Company (1910), and Allison Transmission (1915). Some of the city's most prominent architectural features and best-known historical events date from

15008-574: The short verticals will also be used to anchor the supports. Thus the short-span girders can be made lighter because their span is shorter. A good example of the Baltimore truss is the Amtrak Old Saybrook – Old Lyme Bridge in Connecticut , United States. The Bollman Truss Railroad Bridge at Savage, Maryland , United States is the only surviving example of a revolutionary design in the history of American bridge engineering. The type

15142-451: The simplest truss styles to implement, the king post consists of two angled supports leaning into a common vertical support. This type of bridge uses a substantial number of lightweight elements, easing the task of construction. Truss elements are usually of wood, iron, or steel. A lenticular truss bridge includes a lens-shape truss, with trusses between an upper chord functioning as an arch that curves up and then down to end points, and

15276-492: The site, adopting the name Indianapolis on January 6, 1821. In April, Alexander Ralston and Elias Pym Fordham were appointed to survey and design a town plan for the new settlement. Indianapolis became a seat of county government on December 31, 1821, when Marion County , was established. A combined county and town government continued until 1832 when Indianapolis was incorporated as a town. Indianapolis became an incorporated city effective March 30, 1847. Samuel Henderson ,

15410-474: The spring and summer, with slightly higher averages during May, June, and July. May is typically the wettest, with an average of 5.05 inches (12.8 cm) of rain. Most rain is derived from thunderstorm activity. There is no distinct dry season, although occasional droughts occur. Severe weather is not uncommon, particularly in the spring and summer months. Indianapolis experiences an average of 20 thunderstorm days annually. Indianapolis's average annual rainfall

15544-454: The standard for covered bridges built in central Ohio in the late 1800s and early 1900s. The Pegram truss is a hybrid between the Warren and Parker trusses where the upper chords are all of equal length and the lower chords are longer than the corresponding upper chord. Because of the difference in upper and lower chord length, each panel is not square. The members which would be vertical in

15678-414: The strength to maintain its shape, and the resulting shape and strength of the structure are only maintained by the interlocking of the components. This assumption means that members of the truss (chords, verticals, and diagonals) will act only in tension or compression. A more complex analysis is required where rigid joints impose significant bending loads upon the elements, as in a Vierendeel truss . In

15812-481: The term lenticular truss and, according to Thomas Boothby, the casual use of the term has clouded the literature. The Long truss was designed by Stephen H. Long in 1830. The design resembles a Howe truss , but is entirely made of wood instead of a combination of wood and metal. The longest surviving example is the Eldean Covered Bridge north of Troy, Ohio , spanning 224 feet (68 m). One of

15946-542: The top or the bottom are the most common as this allows both the top and bottom to be stiffened, forming a box truss . When the roadbed is atop the truss, it is a deck truss; an example of this was the I-35W Mississippi River bridge . When the truss members are both above and below the roadbed it is called a through truss; an example of this is the Pulaski Skyway , and where the sides extend above

16080-878: The transition between USDA plant hardiness zones 6a and 6b. Typically, summers are fairly hot, humid, and wet. Winters are generally cold with moderate snowfall. The July daily average temperature is 75.4 °F (24.1 °C). High temperatures reach or exceed 90 °F (32 °C) an average of 18 days each year, and occasionally exceed 95 °F (35 °C). Spring and autumn are usually pleasant, if at times unpredictable. Midday temperature drops exceeding 30 °F or 17 °C are common during March and April, and instances of very warm days (80 °F or 27 °C) followed within 36 hours by snowfall are not unusual during these months. Winters are cold, with an average January temperature of 28.1 °F (−2.2 °C). Temperatures dip to 0 °F (−18 °C) or below an average of 3.7 nights per year. The rainiest months occur in

16214-542: The turn of the 20th century. The Soldiers' and Sailors' Monument , dedicated on May 15, 1902, would later become the city's unofficial symbol. Ray Harroun won the inaugural running of the Indianapolis 500 , held May 30, 1911 , at Indianapolis Motor Speedway . Indianapolis was one of the hardest hit cities in the Great Flood of 1913 , resulting in five known deaths and the displacement of 7,000 families. Once home to 60 automakers, Indianapolis rivaled Detroit as

16348-428: The upper chord under compression. In a cantilever truss the situation is reversed, at least over a portion of the span. The typical cantilever truss bridge is a "balanced cantilever", which enables the construction to proceed outward from a central vertical spar in each direction. Usually these are built in pairs until the outer sections may be anchored to footings. A central gap, if present, can then be filled by lifting

16482-518: The year Indiana gained statehood, the U.S. Congress donated four sections of federal land to establish a permanent seat of state government. Two years later, under the Treaty of St. Mary's (1818), the Delaware relinquished title to their tribal lands in central Indiana, agreeing to leave the area by 1821. This tract of land, which was called the New Purchase , included the site selected for

16616-414: Was also easy to assemble. Wells Creek Bollman Bridge is the only other bridge designed by Wendel Bollman still in existence, but it is a Warren truss configuration. The bowstring truss bridge was patented in 1841 by Squire Whipple . While similar in appearance to a tied-arch bridge , a bowstring truss has diagonal load-bearing members: these diagonals result in a structure that more closely matches

16750-553: Was built to carry I-65 over the Ohio River. Because of the location of the Big Four Bridge and the growth of the Kennedy Interchange , the interchange had to avoid the columns that were on the approach to the bridge, causing the interchange to have several two-lane ramps rather than a single stretch of highway, and helped earn the nickname Spaghetti Junction . In 1988 Oscar Arias , President of Costa Rica, contacted Louisville mayor Jerry Abramson to inquire about buying

16884-453: Was first conceived in Jeffersonville in 1885 by various city interests. The Louisville and Jeffersonville Bridge Company was formed in 1887 to construct the Big Four Bridge, after a charter by the state of Indiana ; Kentucky also chartered the company in 1888. The riverboat industry, a big economic factor in Jeffersonville, had requested that the bridge be built further upstream from the Falls of

17018-405: Was named after its inventor, Wendel Bollman , a self-educated Baltimore engineer. It was the first successful all-metal bridge design (patented in 1852) to be adopted and consistently used on a railroad. The design employs wrought iron tension members and cast iron compression members. The use of multiple independent tension elements reduces the likelihood of catastrophic failure. The structure

17152-463: Was passed in 1905 restricting building heights on the traffic circle to 86 ft (26 m) to protect views of the 284 ft (87 m) monument. The ordinance was revised in 1922, permitting buildings to rise to 108 ft (33 m), with an additional 42 ft (13 m) allowable with a series of setbacks . A citywide height restriction ordinance was instituted in 1912, barring structures over 200 ft (61 m). Completed in 1962,

17286-683: Was popular with the Baltimore and Ohio Railroad . The Appomattox High Bridge on the Norfolk and Western Railway included 21 Fink deck truss spans from 1869 until their replacement in 1886. There are also inverted Fink truss bridges such as the Moody Pedestrian Bridge in Austin, Texas. The Howe truss , patented in 1840 by Massachusetts millwright William Howe , includes vertical members and diagonals that slope up towards

17420-468: Was redeveloped into the Canal Walk, a cultural and recreational amenity. North of 18th Street, the canal retains much of its original appearance, flowing through the northside neighborhoods of Riverside , Butler–Tarkington , Rocky Ripple , and Broad Ripple . This segment has been recognized as an American Water Landmark since 1971. Compared to American cities of similar populations, Indianapolis

17554-509: Was successful in landing the U.S. Olympic Festival in 1982, securing the relocation of the Baltimore Colts in 1984, and hosting the 1987 Pan American Games . Beginning in 1992, the mayoral administration of Stephen Goldsmith introduced a number of austerity measures to address budget shortfalls through privatization and greater reliance on public–private partnerships . Major downtown revitalization projects continued through

17688-435: Was the conductor that finally noticed the error midway across the Big Four Bridge. The wayward train had to back up all the way back to Otisco. On September 12, 1905, the first interurban crossed the Big Four Bridge. On January 14, 1918, two interurbans collided on the Big Four Bridge at 5:30 PM in a blinding snowstorm, killing three passengers (Thomas Alvey, George Greenwald, and Leo Hagan), and injuring 20 aboard. Due to

17822-565: Was the first of its kind in the world when it opened in 1853. During the American Civil War , Indianapolis was mostly loyal to the Union cause. Governor Oliver P. Morton , a major supporter of President Abraham Lincoln , quickly made Indianapolis a rallying place for Union army troops. On February 11, 1861, President-elect Lincoln arrived in the city, en route to Washington, D.C. for his presidential inauguration , marking

17956-848: Was the second Allan truss bridge to be built, the oldest surviving bridge in the Australian Capital Territory and the oldest, longest continuously used Allan truss bridge. Completed in November 1895, the Hampden Bridge in Wagga Wagga, New South Wales , Australia, the first of the Allan truss bridges with overhead bracing, was originally designed as a steel bridge but was constructed with timber to reduce cost. In his design, Allan used Australian ironbark for its strength. A similar bridge also designed by Percy Allen

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