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Rockville Stone Arch Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1900-1909DateCreated: 1902Susquehanna RiverMarysvilleState: PAZip: 17053Country: USAWebsite: http://www.asce.org/Project/Rockville-Stone-Arch-Bridge/

The third bridge built on the same site to carry railroad tracks across the Susquehanna River just north of Harrisburg, Pennsylvania, the Rockville Stone Arch Bridge, at 3,820 feet long and 52 feet wide, is believed to be the longest and widest stone-arch railroad bridge in the world. A central link in rail travel between New York City and Pittsburgh, the Rockville Stone Arch Bridge accommodates four lines of railroad tracks, today serving both the Norfolk Southern and Amtrak lines.

YearAdded:
1979
Image Credit: Courtesy Flickr/John Mueller (CC BY 2.0)Image Caption: Rockville Stone Arch BridgeEra_date_from: 1902
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
Ellicott's Stone
Society: ASCEMain Category: CivilSub Category: Boundaries & SurveysEra: 1750-1799DateCreated: 1799Unnamed RdBucksState: ALZip: 36512Country: USAWebsite: https://www.asce.org/project/ellicott-stone/Creator: Ellicott, Andrew

The stone was set by the joint U.S.-Spanish survey party on April 10, 1799.  Made of sandstone, it is roughly two feet high and eight inches thick. On the north side of the stone is the inscription "U.S. Lat. 31, 1799." On the south side is "Dominio de S.M. Carlos IV, Lat. 31, 1799."

YearAdded:
1968
Image Credit: Public Domain (Author's Choice)Image Caption: Ellicott's StoneEra_date_from: 1799
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