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The Tabernacle in December 2008
Society: ASCEMain Category: CivilSub Category: BuildingsEra: 1860-1869DateCreated: 1867Mormon TabernacleSalt Lake CityState: UTZip: 84150Country: USAWebsite: Grow, Henry

Just 20 years after settling the uninhabited Salt Lake valley, Brigham Young and his Mormon followers completed one of the nation's most impressive public structures. The 9,000-seat Mormon Tabernacle boasts a clear span roof measuring 150 feet by 250 feet, its timber trusses joined with wooden pegs and lashed with green rawhide, which shrank and tightened as it dried.

Image Credit: Courtesy Wikicommons/Leon7 (CC BY-SA 3.0)Image Caption: The Tabernacle in December 2008.Era_date_from: 1867
Eads Bridge
Society: ASCEMain Category: CivilSub Category: Water TransportationEra: 1870-1879DateCreated: 1874Eads BridgeEast St. LouisState: ILZip: 62201Country: USAWebsite: Eads, James

In the decade following the Civil War, the Mississippi River began to lose its standing as the primary transport artery in the Midwest. Railroads were taking over, and Chicago was rapidly becoming the center of Midwestern commerce. The Eads Bridge was the first major railroad link over the Mississippi, constructed by the city of St. Louis in an attempt to maintain its dominance as a regional commercial hub.

Image Credit: Courtesy Flickr/Patrick Yodarus (CC BY-SA 2.0)Image Caption: Eads BridgeEra_date_from: 1874
Druid Lake Dam
Society: ASCEMain Category: CivilSub Category: DamsEra: 1870-1879DateCreated: 1871Druid Hill ParkBaltimoreState: MDCountry: USAWebsite: Martin, Robert

Like other American cities in the late 19th century, Baltimore had grown so quickly its supply system was unable to provide city residents with a dependable supply of water. Two reservoirs built outside the city helped increase capacity, but heavy rainfalls in the largely agricultural area tended to foul this additional water supply. City officials elected to construct a holding reservoir within the city - contained by an earthen dam - where silty water would be allowed to settle. No such project had ever been undertaken in the United States.

Image Credit: Courtesy Flickr/Jeff Covey (CC BY-SA 2.0)Image Caption: Druid Lake DamEra_date_from: 1871
Bethlehem Waterworks
Society: ASCEMain Category: CivilSub Category: Water Supply & ControlEra: 1750-1799DateCreated: 1761Historic Subdistrict ABethlehemState: PAZip: 18018Country: USAWebsite: Christiansen, Hans Christopher , Moravians

The first known pumping system providing drinking and wash water in the North American colonies. The building (still standing) is dated 1761, but it was preceded by an experimental frame building dated 1754. Before the Bethlehem built its system, assigned carriers would daily haul water up the hill from a well near the city gate. A wooden waterwheel, driven by the flow of Monocacy Creek, drove wooden pumps which lifted the water through wooden pipes to the top of the hill where the water was distributed by gravity.

Image Credit: Courtesy Flickr/Discover Lehigh Valley (CC BY 2.0)Image Caption: Through multiple restorations (1964, 1972, 1975), the Bethlehem Waterworks still stands today, despite being over 250 years old.Era_date_from: 1761
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