The Starrucca Viaduct of the Erie Railroad Company crosses Starrucca Creek in Lanesboro, Pennsylvania. It is one of the oldest and one of the longest railroad bridges in Pennsylvania. Its 18 slender, semicircular stone arches each span 50 feet and the structure rises 110 feet above the creek.
Civil
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Image Credit:
Courtesy Flickr/Navin Rajagopalan (CC BY-SA 2.0)
Image Caption:
Starrucca Viaduct
Era_date_from:
1848
1973
A Day's Pay According to tunnel records, the following pay rates were established for the 600-700 laborers required for this project:
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Image Credit:
Public Domain
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Postcard of the west end St. Clair River Tunnel in Port Huron, Michigan, United States.
Era_date_from:
1891
1991
The scheme virtually reverses the flow of the Snowy River from its natural course toward the ocean and directs it inland. The entire complex includes 16 dams, seven power stations (with a production capacity of 3,740,000 kilowatts), over 90 miles of tunnels, a pumping station, and 50 miles of aqueducts.
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Image Credit:
Courtesy Wikicommons/Ear1grey (CC BY-SA 3.0)
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Snowy hydro murray 1 machine hall floor
Era_date_from:
1974
1997
This was one of the first power facilities to demonstrate the feasibility of long distance electric power transmission. Through an elaborate switchboard at the main station, tied to similar boards at substations, a complete circuit was created to drive an electric motor 153 miles from the generator a remarkable distance at that time.
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Image Credit:
Courtesy Flickr/Allen Sheffield (CC BY 2.0)
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Snoqualmie Falls
Era_date_from:
1899
1981
Three rivers - the Allegheny, Monongahela, and Ohio - join in Pittsburgh, making the city a natural site for the building of bridges. But the Smithfield Street Bridge stands apart from other Pittsburgh bridges for several reasons: it replaced structures by two well-known bridge engineers, Lewis Wernwag and John A. Roebling; it was the first use in America of the lenticular - or lens-shaped - truss design; and it was one of the first major bridges in the U.S. built primarily with steel.
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Image Credit:
Courtesy Flickr/RJ Schmidt (CC BY-ND 2.0)
Image Caption:
Smithfield Street Bridge
Era_date_from:
1883
1975
Sewall's Bridge is a singular example of an era when wooden trestle bridges carried highway traffic across New England waterways. It is the earliest pile-trestle bridge for which an authentic construction record exists, and the oldest for which builder's drawings survive. Spanning the York River, it was named for Major Samuel Sewall, Jr., the civil engineer who designed and constructed it.
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Image Credit:
Public Domain (State Historical Society of Colorado)
Image Caption:
Sewall's Bridge
Era_date_from:
1761
1986
The Second Street Bridge is a simply ornamented, wrought-iron structure. It is 18 feet wide and spans 225 feet over the Kalamazoo River. It was built to replace a dilapidated wooden bridge that had served the area for nearly 50 years.
The bridge is anchored to fieldstone abutments on each shore, and the deck is composed of wood beams. Iron lattice work provides structural stability and iron finials on the end posts provide aesthetic appeal. It includes a wooden pedestrian walkway.
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Image Credit:
Courtesy Wikipedia/Chris Light
Image Caption:
Second Street Bridge
Era_date_from:
1886
1982
Traversing the Great Glen of the Scottish Highlands for 60 miles the Caledonian Canal connects the North Sea by Beauly and Moray Firth on the east coast with the Irish Sea by Lochs Linnhe and Eil on the west. Thirty eight miles of the canal pass through freshwater lochs Douchfour, Ness, Oich and Lochy with the remaining 22 miles formed by earth cutting. Initially 28 locks, and later 29, were required to reach the summit elevation of 106 feet at Loch Oich.
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Image Credit:
Courtesy Flickr/Dave Conner (CC BY 2.0)
Image Caption:
Caledonian Canal
Era_date_from:
1804
2007
The Savannah city plan, whose execution began in 1733, is distinguished from those of previous colonial towns by the repeated pattern of connected neighborhoods, multiple squares, streets, and designed expansion into lands held by the city. It is unique in the history of urban planning in a number of aspects, not the least of which is that the squares allow for more open space in Savannah than any city layout in history.
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Image Credit:
Courtesy Wikipedia/PurpleChez
Image Caption:
City Plan of Savannah
Era_date_from:
1733
1977
Located at the northern tip of Michigan where Lake Superior, Lake Michigan, and Lake Huron join together, the Sault Ste. Marie Hydroelectric Power Complex was built to harness the hydroelectric potential of the 20-foot falls at the headwaters of the St. Marys (sic) River, the sole outlet of Lake Superior. A century after its construction, the plant remains the largest low-head hydroelectric facility in the United States. Today, the Sault Ste. Marie plant supplies electricity to area residents, especially those in the Upper Peninsula of Michigan.
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Image Credit:
Courtesy Flickr/Madison Berndt (CC BY 2.0)
Image Caption:
Sault Ste. Marie Hydroelectric Complex
Era_date_from:
1902
1983
Innovations
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