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Union Canal Tunnel
Society: ASCEMain Category: CivilSub Category: TunnelsEra: 1800-1829DateCreated: 1828Union CanalLebanonState: PACountry: USAWebsite: http://www.asce.org/Project/Union-Canal-Tunnel/Creator: Ives, John

According to oral history, George Washington visited the canal diggings in 1792, and then again in 1794, while he was accompanying troops to suppress the Whiskey Rebellion in Western Pennsylvania. 

YearAdded:
1970
Image Credit: Courtesy Flickr/Ospreye (CC BY 2.0)Image Caption: Union Canal TunnelEra_date_from: 1828
Tunkhannock Viaduct
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1910-1919DateCreated: 1915Tunkhannock CreekNicholsonState: PAZip: 18446Country: USAWebsite: http://www.asce.org/Project/Tunkhannock-Viaduct/Creator: Cohen, Abraham Burton, Delaware, Lackawanna and Western Railroad

This majestic viaduct was built during the golden age of railroading. It was at the western end of a major readjustment in grade and alignment of the Erie-Lackawanna Railroad, and had double tracks to carry the trains across the valley of Tunkhannock Creek. The Hallstead cutoff (between Scranton, Pennsylvania and Hallstead, New Jersey) reduced passenger travel time by 20 minutes, and freight travel time by over an hour.

YearAdded:
1975
Image Credit: Original Photo: Flickr/Jim Danvers (CC BY 2.0)Image Caption: Tunkhannock ViaductEra_date_from: 1915
Bollman Truss Bridge
Society: ASCEMain Category: CivilSub Category: Bridges, TransportationEra: 1860-1869DateCreated: 1869Little Patuxent RiverSavageState: MDCountry: USAWebsite: http://www.asce.org/Project/Bollman-Truss-Bridge/Creator: Bollman, Wendel

The design of the Bollman Truss Bridge-patented in 1852 and one of the first to use iron exclusively in all essential structural elements-was critical in the rapid expansion of American railroads in the 19th century. Replacing wooden bridges, which  were cumbersome to build and vulnerable to decay, the Bollman Truss Bridge could be built relatively quickly and inexpensively, while providing the long-lasting qualities associated with metal. This allowed new rail lines to be built over long distances in a short period of time.

YearAdded:
1966
Image Credit: Courtesy Flickr/Andrew Bossi (CC BY-SA 2.0)Image Caption: Bollman Truss Bridge as it looks today, after the repairs done in 1934-84.Era_date_from: 1869
Borden Base Line
Society: ASCEMain Category: CivilSub Category: Boundaries & SurveysEra: 1830-1839DateCreated: 1831South DeerfieldState: MACountry: USAWebsite: http://www.asce.org/Project/Borden-Base-Line/Creator: Paine, Robert Treat , Borden, Simeon

The Borden Base Line is a 39,009.73 feet (7.42 miles ) survey line through the State of Massachusetts. The line was the first project of its kind undertaken in America and its establishment was the key element for Massachusetts pioneering mandate to survey the entire state. 

The challenge was to use trigonometrical principles, instead of astronomical observation alone, to provide greater accuracy in surveying large areas.

YearAdded:
1981
Image Credit: Public Domain (Copyright Exp.)Image Caption: An 1871 map of Massachusetts highlighting the Borden Base LineEra_date_from: 1831
Triborough Bridge Project
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1930-1939DateCreated: 1936Robert F. Kennedy BridgeNew YorkState: NYZip: 10035Country: USAWebsite: http://www.asce.org/Project/Triborough-Bridge-Project/Creator: Moses, Robert , Ammann, Othmar

The Triborough Bridge Project is a three-branched waterway crossing that connects Manhattan, the Bronx, and Queens at a junction of the East River and the Harlem River in New York City. The complex structure includes a suspension bridge from Wards Island to Queens, a vertical lift span from Randall's Island to Manhattan, a fixed span (designed to be convertible to a lift span) across the Bronx Kills, viaducts, and an innovative three-legged roadway interchange.

YearAdded:
1986
Image Credit: Public Domain (National Park Service)Image Caption: Triborough Bridge ProjectEra_date_from: 1936
Central Pacific Railroad
Society: ASCEMain Category: CivilSub Category: Roads & RailsEra: 1860-1869DateCreated: 1863-1869Western AmericaOgdenState: UTCountry: USAWebsite: http://www.asce.org/project/central-pacific-railroad/Creator: Judah, Theodore , Crocker, Charles

Central Pacific Railroad served as the Western terminus of America's first transcontinental railroad, passing through the formidable Sierra Nevada Mountains. In all, 15 tunnels were blasted through solid granite. 

Thousands of Chinese from Kwantung Province were recruited by Central Pacific Railroad Company and became known for their diligence and hard work. In the second year of construction, nine out of ten workers on the CPRR were Chinese.

YearAdded:
1968
Image Credit: Courtesy Flickr/Jim Bowen (CC BY 2.0)Image Caption: Central Pacific RailroadEra_date_from: 1863
Tipon
Society: ASCEMain Category: CivilSub Category: Civil Engineering ProfessionEra: 1000-1599DateCreated: 1200 - 1534Acceso a Tipon
TiponCountry: PeruWebsite: http://www.asce.org/Project/Tipon/Creator: Incan Civilization and predecessors

Tipon is a self-contained, walled settlement that served as an estate for Inca nobility. Located 13 miles down the Huatanay River Valley by the Inca capital of Cusco, the 500-acre archeological site provides knowledge and better understanding of the pre-historic Inca and their irrigation and building skills. The site represents great mastery of irrigation and hydraulic technology. The civil engineers of Tipon designed buildings, 13 integrated central terraces, waterworks, hundreds of other terraces and massive structures to be visually and functionally harmonious with their surroundings.

YearAdded:
2006
Image Credit: Courtesy Flickr/Emmanuel Dyan (CC BY 2.0)Image Caption: TiponEra_date_from: 1200
Thomas Viaduct Railroad Bridge
Society: ASCEMain Category: CivilSub Category: Roads & RailsEra: 1830-1839DateCreated: 1835Patapsco RiverArbutusState: MDZip: 21227Country: USAWebsite: http://www.asce.org/Project/Thomas-Viaduct-Railroad-Bridge/Creator: Latrobe II, Benjamin Henry, McCartney, John

Opened in 1835, the Thomas Viaduct was the first multiple-arch, stone railroad viaduct in the United States. The viaduct is composed of eight arches each with a clear span of about 58 feet. The viaduct has an overall length of 614 feet and a height of about 60 feet above the Patapsco River. Construction of the viaduct began in August of 1833, and a ceremony marking its completion was conducted on July 4, 1835. The viaduct was constructed for the Baltimore and Ohio (B&O) Railroad and is named in honor Philip E. Thomas, who served from 1827 to 1836 as the first president of the B&O.

YearAdded:
1964
Image Credit: Public Domain (National Park Service)Image Caption: Thomas Viaduct Railroad BridgeEra_date_from: 1835
Theodore Roosevelt Dam
Society: ASCEMain Category: CivilSub Category: Water Supply & ControlEra: 1910-1919DateCreated: 1911Theodore Roosevelt DamTonto National ForestState: AZZip: 85545Country: USAWebsite: http://www.asce.org/Project/Theodore-Roosevelt-Dam---Salt-River-Project/

The first electric power generated by the Theodore Roosevelt Dam for commercial use was transmitted over a high-voltage line to Phoenix, where it was employed to operate the city's new streetcar system. 

YearAdded:
1970
Image Credit: Courtesy Bureau of Reclamation (CC BY-SA 2.0)Image Caption: Theodore Roosevelt DamEra_date_from: 1911
Thames Tunnel
Society: ASCEMain Category: CivilSub Category: TunnelsEra: 1840-1849DateCreated: 1843Beneath the Thames RiverLondonCountry: UKWebsite: http://www.asce.org/Project/Thames-Tunnel/Creator: Brunel, Marc Isambard , Brunel, Isambard Kingdom

By the turn of the 19th century, London's streets were clogged with traffic. Over 3,700 passengers used the Thames River's main boat crossing each day, while wagons and carts were forced to cross via the London Bridge, two miles away. Building a bridge would further impede shipping on the already-crowded Thames; a tunnel was the obvious alternative.

The first attempt at a tunnel in the present location began in 1807. The excavation had proceeded only 1,000 feet-using traditional mining methods-when crews reached a layer of quicksand and were forced to stop.

YearAdded:
1991
Image Credit: Courtesy Flickr/Annie Mole (CC BY 2.0)Image Caption: Thames TunnelEra_date_from: 1843
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