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Society: ASCE Main Category: Civil Sub Category: Bridges Era: 1930-1939 DateCreated: 1937 1-99 San Francisco – Bay Bridge Oakland State: CA Zip: 94607 Country: USA Website: Creator: Purcell, Charles , American Bridge Company
Ever since the Gold Rush days of the 1850s, San Francisco Bay area residents and businesses had lobbied for a bridge joining San Francisco and Oakland. Early studies indicated that the bridge was impractical and infeasible; but in October 1929, President Herbert Hoover (himself an engineer) and California Governor C. C. Young appointed the Hoover-Young San Francisco Bay Bridge Commission to study the question more closely.
Image Credit: Courtesy Flickr/David Baron (CC BY-SA 2.0) Image Caption: San Francisco - Oakland Bay Bridge Era_date_from: 1937
Norris Dam
Society: ASCE Main Category: Civil Sub Category: Dams Era: 1930-1939 DateCreated: 1936 Norris Dam Knoxville State: TN Zip: 37705 Country: USA Website: Creator: Wank, Roland

Norris Dam impounds the Clinch River, a mountain tributary of the Tennessee River. The facility stands as a tribute and symbol of the birth of the Tennessee Valley Authority (TVA). Given broad jurisdiction over resource development in the watershed (a 40,000-square-mile basin comprising parts of Virginia, North Carolina, Georgia, Alabama, Mississippi, Kentucky, and Tennessee), the TVA was formed to plan for flood control, improve navigation, and produce hydroelectric power.

Image Credit: Courtesy Flickr/vosburg09 (CC BY 2.0) Image Caption: Norris Dam Era_date_from: 1936
New Castle Ice Harbor
Society: ASCE Main Category: Civil Sub Category: Water Transportation Era: 1750-1799 DateCreated: 1794 Ice Harbor
Delaware 19709
New Castle State: DE Zip: Country: USA Website: Creator: Delafield, Richard

In 1794, the Delaware legislature authorized a lottery to fund the erection of ice piers in the harbor at New Castle. The ice harbor was designed to protect anchored ships from storms and ice. At the time, New Castle served as the principal winter port for ships from the Port of Philadelphia because ice on the Delaware River posed such a serious hazard to the wooden-hulled vessels. The harbor was the first of its type on the river and the last one to be maintained as the need for them declined. It served as a model for the other four harbors constructed in the area.

Image Credit: Image Caption: New Castle Ice Harbor Era_date_from: 1794
Cranetown Triangulation Site
Society: ASCE Main Category: Civil Sub Category: Boundaries & Surveys Era: 1800-1829 DateCreated: 1817 Kip's Castle Park Essex County State: NJ Zip: Country: USA Website: Creator: Hassler, Ferdinand

The precise system of measurements provided today by the U.S. Coast and Geodetic Survey originated with an act of Congress under the administration of Thomas Jefferson in 1807 that funded work on "an accurate chart" of America's coastal waters. Intended to aid sea-going commerce, the first work on this project, carried out in 1816 and 1817, helped establish a complex grid of geodetic reference points on which much of our land- and sea-based navigation now depends. 

Image Credit: Source: (National Oceanic and Atmospheric Administration) Image Caption: Cranetown Triangulation Site Era_date_from: 1817
Eiffel Tower
Society: ASCE Main Category: Civil Sub Category: Buildings Era: 1880-1889 DateCreated: 1889 AvenueAnatole75007 Paris State: Zip: Country: France Website: Creator: Eiffel, Gustave , Sauvestre, Stephen

The Eiffel Tower was built for the International Exhibition of Paris of 1889 commemorating the centenary of the French Revolution. Of the 700 proposals submitted in a design competition, Gustave Eiffel's was unanimously chosen. At 300 meters and 7,000 tons, it was the world's tallest building until 1930.

The elevators ascend and descend within the curved legs of the tower, starting at an angle of 54 degrees from horizontal at the base and leveling out to 78 degrees at the top. The elevator cars are built with seatbacks that rotate to adjust to the varying angle.

Image Credit: Courtesy of Flickr/Sean MacEntee (CC BY 2.0) Image Caption: Eiffel Tower Era_date_from: 1889
Society: ASME Main Category: Mechanical, Mechanical Sub Category: Rail Transportation, Entertainment Era: 1950-1959 DateCreated: 1959 Disneyland Anaheim State: CA Zip: 92803 Country: USA Website: Creator: Wenner-Gren, Axel, ALWEG
Disney engineers designed this monorail system based on the system developed by Axel Wenner-Gren of the Alweg Company in Cologne, West Germany. Wenner-Gren ran his experimental monorail in 1952 on a level track, and when adopted by Disney in 1959, it was designed to simulate the terrain typical of urban transit. Opening in 1959, the system has been in continuous operation as a passenger service carrying an average of 340,000 passengers a year and logging 10,000 miles. The original trains were replaced in 1969 and a new fleet introduced in 1987 to upgrade the existing chassis.
Image Credit: Courtesy Flickr/prayitno (CC BY 2.0) Image Caption: Disneyland Monorail System Era_date_from: 1959
Fairbanks Exploration Company Gold Dredge No. 8
Society: ASME Main Category: Mechanical Sub Category: Minerals Extraction & Refining Era: 1920-1929 DateCreated: 1928 1755 Old Steese Hwy N Fairbanks State: AK Zip: 99712 Country: USA Website: Creator: U.S. Smelting, Refining, and Mining Company (USSR&M)

This floating dredge is one of the last mammoth gold dredges in the Fairbanks Mining District that traveled an ancient stream bed, thawing the ground ahead of it and scooping up the gravel. During 32 years of operation, a fortune in gold washed through its sluices. Ladder dredges came to Alaska in the early 1920s, after the U.S. Smelting, Refining, and Mining Company (USSR&M) brought water to the area via the 90-mile Davidson Ditch. Using the water to warm the ground, the ground was thawed at an average 9 inches a day.

Image Credit: Courtesy Flickr/Roger Wollstadt (CC BY-SA 2.0) Image Caption: Fairbanks Exploration Company Gold Dredge No. Era_date_from: 1928
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