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Moffat Tunnel
Society: ASCE Main Category: Civil Sub Category: Tunnels, Water Supply & Control Era: 1920-1929 DateCreated: 1928 Thru the Continental Divide Nederland State: CO Zip: 80466 Country: USA Website: Creator: Moffat, David , Moffat Tunnel Improvement District

Known as "the highest and lowest holing in history," the tunnel bored through the Rockies at an elevation of 9,200 feet, 2,800 feet below the surface. Eight hundred men worked around the clock for 3 1/2 years, moving 3 billion pounds of rock. 

Image Credit: Courtesy Flickr/Bradley Gordon (CC BY 2.0) Image Caption: Moffat Tunnel Era_date_from: 1928
Minot's Ledge Lighthouse
Society: ASCE Main Category: Civil Sub Category: Water Transportation Era: 1860-1869 DateCreated: 1860 Minots Ledge Scituate State: MA Zip: Country: USA Website: Creator: Totten, Joseph , Cook, John

Minot's Ledge is a wave-swept rock formation in a rocky area of ocean about a mile off the Cohasset shore near Boston. Numerous serious shipwrecks prompted the government to erect a beacon there, and construction began in the summer of 1847.  

The light, constructed on tall iron legs, was put into operation on January 1, 1850. Designers believed that the water would flow freely through the legs, leaving the lighthouse intact. But a terrible winter storm toppled it in 1851, killing the two assistant keepers.  

Image Credit: Public Domain (United States Coast Guard) Image Caption: Minot's Ledge Lighthouse Era_date_from: 1860
Milwaukee Metropolitan Sewage Treatment Plant
Society: ASCE Main Category: Civil Sub Category: Water Supply & Control Era: 1910-1919 DateCreated: 1919 Lake Freeway Milwaukee State: WI Zip: 53207 Country: USA Website: Creator:

This was America's first large-scale activated sludge plant. The successful operation of Milwaukee's sewage treatment plant led the way for many other American municipalities to adopt its methods of efficient environmental recycling.

Prior to 1925, sewage and industrial waste from the City of Milwaukee and its suburbs (then population 500,000) was discharged to the Milwaukee, Menomonee, and Kinnickinnic rivers, which converge in Milwaukee and flow together through a single outlet into Lake Michigan.

Image Credit: Public Domain (National Park Service) Image Caption: Milwaukee Metropolitan Sewage Treatment Plant Era_date_from: 1919
United States Military Academy
Society: ASCE Main Category: Civil Sub Category: Civil Engineering Profession Era: 1800-1829 DateCreated: 1813 On the Hudson River West Point State: NY Zip: 10996 Country: USA Website: Creator: Jefferson, Thomas , Thayer, Sylvanus

In 1794, Congress authorized and President Thomas Jefferson signed into law the raising of a Corps of Artillerists and Engineers (now the United States Army Corps of Engineers) to be educated and stationed at the newly created United States Military Academy. The U.S. Military Academy was the first school of engineering in America to offer formal instruction in civil engineering. 

Image Credit: Original Image: Public Domain (US Army) Image Caption: United States Military Academy Era_date_from: 1813
Middlesex Canal
Society: ASCE Main Category: Civil Sub Category: Water Transportation Era: 1800-1829 DateCreated: 1803 71 Faulkner Street Billerica State: MA Zip: 01862 Country: USA Website: Creator: Baldwin, Loammi , Weston, William

While the Erie Canal  has become well-known in the annals of American history, the Middlesex Canal, built two decades earlier and a model for canal engineers throughout young America, has only recently become recognized for its important achievements. Extending 27 miles northeast from Boston harbor to the Merrimack River near present-day Lowell, Masachusetts, the Middlesex Canal provided low-cost and efficient freight transport for almost five decades, helping to establish the canal in the U.S. as a viable means of economic development.  

Image Credit: Courtesy Wikipedia/Daderot (CC BY-SA 3.0) Image Caption: Middlesex Canal Era_date_from: 1803
McNeill Street Pumping Station
Society: ASCE Main Category: Civil Sub Category: Water Supply & Control Era: 1880-1889 DateCreated: 1887 Water Works Museum Shreveport State: LA Zip: 71101 Country: USA Website: Creator: Worthington, Henry R.

The city of Shreveport could not justify the cost of building a water distribution system solely for the purpose of supplying potable water. It was a series of disastrous fires in the 1880s that galvanized support for a pumping facility that would provide ample water for firefighting. 

Image Credit: Public Domain (National Park Service) Image Caption: McNeill Street Pumping Station Era_date_from: 1887
Rogue River Bridge
Society: ASCE Main Category: Civil Sub Category: Bridges Era: 1930-1939 DateCreated: 1931 Rogue River Gold Beach State: OR Zip: 97444 Country: USA Website: Creator: McCullough, Conde

The Rogue River Bridge was the most advanced concrete bridge in America when it was built. Distinguished bridge engineer Conde McCullough employed the techniques of Frenchman Eugene Freyssinet to create thin, graceful concrete arches for this seven-span structure.

Pre-compression of the concrete arch was achieved and, as a result of its success, pre-stressing became one of the hallmarks of American bridge building techniques.

Image Credit: Courtesy Flickr/Bruce Fingerhood (CC BY 2.0) Image Caption: Rogue River Bridge Era_date_from: 1931
Mason-Dixon Line
Society: ASCE Main Category: Civil Sub Category: Boundaries & Surveys Era: 1750-1799 DateCreated: 1767 Delaware Pennsylvania State: Zip: Country: USA Website: Creator: Mason, Charles , Dixon, Jeremiah

The granite milestones marking the Mason-Dixon Line bear crests from the two parties involved in the land-grant dispute, the families of William Penn and Charles Calvert (also known as Lord Baltimore). 

Image Credit: Original Image: Flickr/Padraic (CC BY-SA 2.0) Image Caption: Mason-Dixon Line Era_date_from: 1767
Marshall Building
Society: ASCE Main Category: Civil Sub Category: Buildings Era: 1900-1909 DateCreated: 1906 207 E. Buffalo Street Milwaukee State: WI Zip: 53202 Country: USA Website: Creator: Turner, Claude

Designed by Claude A. P. Turner, a pioneer of reinforced concrete construction, the Marshall Building was constructed originally in 1906 as a five-story building. In 1911 the sixth floor of the building was added as per Turner's original design. This building is the oldest extant example of Turner's "mushroom" flat-slab system which transformed the design and construction of reinforced-concrete floors worldwide.

Image Credit: Courtesy ASCE Image Caption: Marshall Building Era_date_from: 1906
Manhattan Bridge
Society: ASCE Main Category: Civil Sub Category: Bridges Era: 1900-1909 DateCreated: 1909 Manhattan Bridge Brooklyn State: NY Zip: 11201 Country: USA Website: Creator: Nichols, Othniel Foster , Moisseiff, Leon

When opened in 1909, the 1,470 foot long main span of the Manhattan Bridge was the third longest suspension bridge span in the world, after the nearby Brooklyn and Williamsburg Bridges. The Manhattan Bridge has two 725 foot long suspended side spans for an overall length of 2,920 feet. The bridge deck is supported by 4 main cables of 20.75 inch diameter, each composed of more than 35,000 individual wires. The bridge deck is stiffened by four parallel trusses of 24 foot depth, hinged at the towers.

Image Credit: Courtesy Flickr/Dave Herholz (CC BY-SA 2.0) Image Caption: Manhattan Bridge Era_date_from: 1909
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