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73-585: Popolopen Torne (officially called "The Torne") is a small peak with a relatively sharp and barren summit, part of the Hudson Highlands , at 942 feet (287 meters) above sea level. The blue- blazed , horseshoe-shaped Timp Torne trail makes a loop from Mine Torne Road to the summit and back again. Its short and steep ascent offers hikers 360° views of the Hudson River, West Point , Bear Mountain , and Harriman State Park . U.S. Route 6 passes through

146-470: 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

219-550: 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

292-599: 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 a lack of durability, and gave way to the Pratt truss design, which was stronger. Again,

365-435: 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

438-481: 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 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

511-477: 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

584-789: 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;

657-459: A pin-jointed structure, one where the only forces on the truss members are tension or compression, not bending. This 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

730-582: A suspended rope truss, which results in a very stiff bridge due to its diagonal braces. Another special feature is the fiber composite deck in lieu of a traditional timber deck for this type of structure. The fiber composite deck adds lightness, long term durability and reduced maintenance requirements. The bridge is of similar design to the Wheeling Suspension Bridge in West Virginia. Iron mining and smelting once took place along

803-545: 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

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876-700: 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

949-519: 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

1022-518: Is exposed in the south wall of upper Hell Hole. Its continuation is unfortunately lost under debris from the construction of [highway] US 6 which mantles most of the Bear Mountain side of the valley." For most of its length through the gorge, the creek is narrow and extremely rocky, with fast moving rapids and several waterfalls. It can only be reached on foot and is not generally navigable by boat. The red-blazed Popolopen Gorge Trail runs along

1095-832: 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

1168-570: 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 , was the second Allan truss bridge to be built, the oldest surviving bridge in

1241-695: 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;

1314-457: Is required where rigid joints impose significant bending loads upon the elements, as in a Vierendeel truss . In 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

1387-407: 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, 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

1460-525: 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

1533-546: Is used for aquatic training such as scuba diving and amphibious assault. In the late nineteenth and early twentieth centuries, cadets from West Point traditionally had a three-day war game dubbed "the Battle of Popolopen" each August. The lake was originally the site of a summer camp. Its waters were drawn to supply nearby mining operations. During World War II , the Army purchased the land for exclusive military use. It adapted

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1606-875: The American Revolutionary War , when it was important for the Continental Army to hold the river valley and prevent the British from cutting New England off from the rest of the colonies. During the Revolutionary War, to prevent British shipping from using the river, the Hudson River Chain was forged at the Sterling Iron Works in Warwick, New York , a town in Orange County . From 1778 to 1782,

1679-770: 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

1752-621: 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

1825-1316: 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

1898-445: 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

1971-481: 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

2044-499: 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 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

2117-641: The Highlands, reaching its deepest point of 216 feet (66 m), near Garrison . Many stretches are challenging to navigate , earning nicknames like "World's End." Prior to European exploration, the Hudson Highlands were inhabited by Native American Lenape people. Henry Hudson and his crew on the Half Moon were the first Europeans known to see the Highlands when they explored the river in 1609. The mountains became strategically important during

2190-598: The Highlands— with the stark contrasts and shadows they offered, in a way that suggested raw nature, a world reborn. After the movement had faded, a critic derisively referred to the movement as the Hudson River School ; the name stuck as the label for the new nation's first homegrown artistic movement. In the early 20th century, in response to damage caused by quarrymen and loggers in the Highlands, local conservationists began to press for public ownership of

2263-533: The Hudson River. The creek's watershed, or drainage basin , covers about 30 square miles (77 km²) It runs mainly through lands occupied by the US Military Academy, to a gorge between Bear Mountain and Popolopen Torne, and drains to the Hudson River at Fort Clinton, New York. Local usage applies "Hell Hole" to a series of small plunge pools within this gorge, although the usage contradicts

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2336-685: 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 ,

2409-409: The U.S. Geological Survey maps and other widely used sources. The geologist K.E. Lowe wrote that the gorge known as Hell Hole is the result of a fault within a regional intrusion of crystalline rock called Storm King granite. He said, "Despite painstaking investigation, the writer found only one outcrop revealing direct evidence of faulting. A badly weathered, unhealed zone of crushed Storm King granite

2482-471: 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 the US started being built on a large scale in the 1870s. Bowstring truss bridges were

2555-469: The area's woods and mountains. Their efforts paid off in the first of several state parks that now blanket the chain. Later that century, an ambitious power-generating plan that would have dug into Storm King Mountain led to a landmark lawsuit by environmental groups that made history when the judge ruled that aesthetic impacts of such large projects could be considered and that a coalition of citizen groups had legal standing. This landmark lawsuit formed

2628-461: 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 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

2701-542: The basis for a large body of case law concerning environmentalism. East (north to south) West (north to south) Deck truss A truss bridge is a bridge whose load-bearing superstructure is composed of a truss , a structure of connected elements, usually forming triangular units. The connected elements, typically straight, may be stressed from tension , compression , or sometimes both in response to dynamic loads. There are several types of truss bridges, including some with simple designs that were among

2774-713: 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 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

2847-406: 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 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

2920-732: 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

2993-497: 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 the more common designs. The Allan truss , designed by Percy Allan ,

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3066-688: The chain was stretched across the river from the Fort Clinton at West Point . The site of the fort is today the easternmost point of the grounds of the United States Military Academy . The only surviving piece of the boom and chain is currently on display at Washington's Headquarters State Historic Site in Newburgh, New York . Several decades after independence, Thomas Cole started an artistic movement by painting America's wild and rugged landscapes— especially, at first,

3139-414: 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

3212-600: 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

3285-416: The creek flow exceeds that of the outlet near the bottom. This intermittent body of water is marked "Roe Pond" on some maps; at least one other pond in the area has the same name. Later converted to a hydroelectric plant, the mill building was demolished in the 1950s. An aqueduct was built on the north side of the gorge in 1906 to bring water from Queensboro Brook and Popolopen Creek to West Point. Another

3358-484: 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

3431-420: The first bridges designed in the 19th and early 20th centuries. A truss bridge is economical to construct primarily because it uses materials efficiently. The nature of a truss allows 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

3504-520: The late eighteenth century. The remains of the furnace have been preserved, as part of the grounds of the West Point Military Reservation . A grist mill was built in 1799 by Eugene Lucet. The Route 9W highway crossing was later constructed downriver from this. A dam was built upstream in 1901, just above the old Hell Hole bridge, to improve the water supply to the mill. The dam is still intact, and water pools behind it when

3577-412: 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

3650-417: The process of isostasy through the late Cenozoic Era . The hills were given their rounded form when glaciers cut through the Appalachian Mountains here. The Highlands are among the lowest summits in that range, and the Appalachian Trail reaches its lowest elevation in the Trailside Zoo between Bear Mountain State Park and Bear Mountain Bridge . Conversely, the river becomes narrower and deeper through

3723-567: The remains of the summer retreat as Camp Popolopen, a POW camp for German prisoners . After the war, the name was changed to Camp Buckner. The New York Department of Environmental Conservation began stocking tiger muskies in Lake Popolopen in 2011. 400 fish measuring 10.5" were stocked in 2011, and 800 fish measuring 10.5" were stocked in 2012. Popolopen Creek—also called Popolopen Brook—is an approximately 10.4-mile-long (16.7 km) stream, fed mainly by Lake Popolopen, Mine Lake, Stillwell Lake, and Weyant's Pond, eventually draining into

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3796-445: 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

3869-451: 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

3942-404: The south in Westchester County and Rockland County , respectively. The highlands are a subrange of the Appalachian Mountains . North to south they fall between Newburgh Bay and Haverstraw Bay , the latter forming the northern region of the New York - New Jersey Highlands . The Hudson River enters this region in the south at Dunderberg Mountain near Stony Point , and from the north in

4015-434: The south side of the creek to a foot bridge just south of Popolopen Torne. Here, it joins the blue-blazed Timp-Torne, 1777 West and 1779 trails. These run along the north side of the creek from Hell Hole to the bridge, with the Timp-Torne detouring over the summit of Popolopen Torne. They cross the footbridge and join the Popolopen Gorge Trail to detour around West Point property, and the combined trails turn southwest and follow

4088-401: 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

4161-464: 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 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

4234-409: 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

4307-442: The top member is sufficiently stiff then this vertical element may be eliminated. If 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

4380-489: 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 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

4453-471: 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 a continuous truss, a cantilever truss does not need to be connected rigidly, or indeed at all, at

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4526-428: 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

4599-399: The upper reaches of Popolopen Creek. The Forest of Dean Mine produced iron ore from the Revolutionary era into the twentieth century, and operated a narrow gauge railroad along the creek as far as the eastern slopes of Popolopen Torne. The mine site has been submerged by Stilwell Lake. Queensboro Furnace, located just above the outlet of Queensboro Brook into the creek, smelted iron during

4672-418: The valley formed between Popolopen Torne and Bear Mountain just before it reaches the Bear Mountain Bridge . Lake Popolopen is a lake northwest of the mountain, on the West Point Military Reservation near New York State Route 293 . Camp Buckner and Camp Natural Bridge are located at the lake, which is frequently used for training and recreation. The lake comprises the largest body of water at West Point, and

4745-426: The valley of Queensboro Brook. During the American Revolution, the mouth of Popolopen Creek was spanned by a pontoon bridge. Much later, the road north from Hessian Lake to Fort Montgomery once crossed the lower part of the gorge by an iron bridge. The steep descents into the gorge and sharp turns onto this bridge made it dangerous for auto traffic. In 1916 the road (then Route 3, renumbered U.S. Route 9W in 1930)

4818-503: The vicinity of Breakneck Ridge and Storm King Mountain near Cornwall, New York . These highlands have played a significant role in America's environmental, cultural, and military history. The bedrock of the Highlands is part of the Reading Prong and more than a billion years old, formed during the Grenville Orogeny . It represents the very core of the Appalachian range, which has been formed by successive mountain-building events ( orogenies ). The present mountains have been exposed by

4891-430: The wood is employed for compression elements while other types may be easier to erect in particular site conditions, or when 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,

4964-414: 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

5037-488: Was built on the south side in 1929–30 to supply Bear Mountain State Park with water from Queensboro Lake. Repairs to the latter required the closing of the combined Popolopen Gorge–1777 West–1779–Timp-Torne trails from the fall of 2008 to spring 2009. Hudson Highlands The Hudson Highlands are mountains on both sides of the Hudson River in New York state lying primarily in Putnam County on its east bank and Orange County on its west. They continue somewhat to

5110-405: 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

5183-414: Was performed in 1992, additional repairs were completed in 2007. . As noted above a new footbridge (built 2002) has been constructed across the Popolopen Creek's just downstream from this bridge. The concept design of this bridge was proposed by Bruce Ramsay & Jim Hume of Cleveland Bridge Pty. Ltd. of the U.K., Cleveland Bridge were also responsible for its construction. The footbridge was designed as

5256-683: 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

5329-423: Was rerouted over a high steel viaduct further downstream, near the site of Fort Montgomery , in 1916. Another bridge was built immediately adjacent in 1936. Called Popolopen Bridge, the 1936 structure is of the deck truss design, more than 600 feet long, 48 feet wide. It rises about 150 feet above the mouth of Popolopen Creek. As of 2000, its average daily traffic was about 18,000 vehicles. Although rehabilitation

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