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1970

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
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
Potowmack Canal and Locks
Society: ASCEMain Category: CivilSub Category: Water TransportationEra: 1750-1799DateCreated: 1799Great Falls ParkFairfax CountyState: VACountry: USAWebsite: http://www.asce.org/Project/Potowmack-Canal-and-Locks/Creator: Washington, George, Potowmack Canal Company

These canals and locks are a part of the first extensive system of canal and river navigation works undertaken in the United States. The idea for the canal was proposed by George Washington, when, as an engineer, surveyor and military emissary for Virginia, he saw the need for a trade route west beyond the Allegheny Mountains. In order to do create this route, it was necessary to try to tame the Potomac River which was a wild, unruly stream which only the hardiest of rivermen ever attempted.

YearAdded:
1970
Image Credit: Courtesy Flickr/Rudi Riet (CC BY-SA 2.0)Image Caption: Potowmack Canal and LocksEra_date_from: 1799
Frankford Avenue Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1600sDateCreated: 1697Pennypack ParkPhiladelphiaState: PAZip: 19114Country: USAWebsite: http://www.asce.org/Project/Frankford-Avenue-Bridge/Creator: Unknown

"For 273 years, the little stone bridge that carries Frankford Ave. across Pennypack Creek has been doing its humble job with a minimum of attention..." 
 - Gerald McKelvey, The Philadelphia Inquirer, September 16, 1970

YearAdded:
1970
Image Credit: Public Domain (National Park Service)Image Caption: Frankford Avenue BridgeEra_date_from: 1697
Cornish - Windsor Covered Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1860-1869DateCreated: 1866Windsor Covered BridgeCornishState: VTZip: 03745Country: USAWebsite: http://www.asce.org/project/cornish-windsor-covered-bridge/Creator: Town, Ithiel

The Cornish-Windsor Covered Bridge is the longest wooden bridge in the United States and the longest two-span, covered bridge in the world. It is also a classic example of wooden bridge-building in 19th-century America. With copious supplies of timber at hand and a generous reserve of carpentry skills available, bridge builders in early America quickly discarded the masonry arches prevalent in the Old World. Instead, they opted for a revival of timber-truss designs dating from 14th century Europe.

YearAdded:
1970
Image Credit: Courtesy Flickr/aussiegtl (CC BY 2.0)Image Caption: Cornish - Windsor Covered BridgeEra_date_from: 1866
Bridgeport Covered Bridge
Society: ASCEMain Category: CivilSub Category: Bridges, TransportationEra: 1860-1869DateCreated: 1862Yuba RiverPenn ValleyState: CAZip: 95946Country: USAWebsite: http://www.asce.org/Project/Bridgeport-Covered-Bridge/Creator: Virginia City Turnpike Company, Burr, Theodore

A product of the Northern California Gold Rush, the Bridgeport Covered Bridge is believed to be the longest, single-span, wooden covered bridge in the United States. Crossing the south fork of the Yuba River at a span of 233 feet, the bridge was built by the Virginia City Turnpike Company as part of a 14-mile toll road authorized by the California state legislature. The toll road was an essential link connecting Virginia City, Nevada, and the silver-producing Comstock Lode with the centers of California commerce.

YearAdded:
1970
Image Credit: Courtesy Flickr/Rick Cooper (CC BY 2.0)Image Caption: The Bridgeport Covered Bridge, one of the longest covered bridges in the nationEra_date_from: 1862
Ascutney Mill Dam
Society: ASCEMain Category: CivilSub Category: DamsEra: 1830-1839DateCreated: 1834Mill BrookWindsorState: VTZip: 05089Country: USAWebsite: http://www.asce.org/Project/Ascutney-Mill-Dam/Creator: Beard, Ithamar , Cobb, Simeon

Ithamar A. Beard, an engineer of some prominence in New England, surveyed the mill brook and selected the best site for a storage dam. Contractor Simeon Cobb, knowledgeable of contemporary civil engineering practices, made major changes to the dam's original design, converting the linear dam into a gentle arch.

YearAdded:
1970
Image Credit: Courtesy Wikipedia/Ymblanter (CC BY-SA 3.0)Image Caption: The Ascutney Mill Arch-Gravity DamEra_date_from: 1834
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