First of its kind

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86th Street Overpass (Polk County, Iowa)
Built 1958; Replaced 1994
Lost Aluminum Bridge over Over I-35 & I-80 on 86th Street in Urbandale
Replaced by new bridge

Alvord Lake Bridge (San Francisco County, California)
Built 1889 by Ernest L. Ransome
Reinforced concrete arch bridge over a pedestrian walkway at Golden Gate Park
Open to traffic

Barton Creek Boulevard Bridge (Travis County, Texas)
Built 1986
Concrete fin back beam bridge over Barton Creek on Barton Creek Blvd.
Open to traffic

Brookside Park Bridge (Cuyahoga County, Ohio)
Built 1909
Closed-spandrel arch bridge over Big Creek on Pedestrian Walkway
Open to traffic

Bussey Bridge (Suffolk County, Massachusetts)
Built 1876; Collapsed 1887
Lost "Hewins" deck truss bridge over South Street on Boston & Providence Railroad
Collapsed

CA&E - Chicago River Bridge (Cook County, Illinois)
Built 1895 for Metropolitan-West Side Elevated Railroad, removed ca 1958 after the CA&E folded in 1957
Lost Pony truss bridge over Chicago River on Chicago, Aurora & Elgin Railroad
Removed but not replaced

Cline Hall of Science-Fitch Hall Skywalk (Polk County, Iowa)
Built 1949
Steel stringer bridge over Pedestrian Pathway on Pedestrian Pathway
Open to pedestrians only

CSX - Carrollton Viaduct (Baltimore, Maryland)
Built in 1829 for the Baltimore and Ohio Railroad, this is the oldest railroad bridge in the world still in use.
Stone arch bridge over Gwynn's Falls
Open to traffic

Dunlap's Creek Bridge (Fayette County, Pennsylvania)
Built 1836-39; rehabilitated 1981
Cast-iron arch bridge over Dunlap Creek on PA 4003 in Brownsville
Open to traffic

First Bridge (Rock Island County, Illinois)
Built 1856, Replaced 1866.
Lost howe through truss bridge over Mississippi River
Lost

Hawk Street Viaduct (Albany County, New York)
Built 1890; Repaired 1925; Closed to everyone but pedestrians 1968; Razed 1970
Cantilevered steel arch bridge over Sheridan Hollow on Hawk Street
Removed

Hawkeye UHPC Bridge (Buchanan County, Iowa)
Built 2015
Concrete stringer bridge over Little Wapsipinicon River Tributary on Deacon Avenue
Open to traffic

High Line Elevated Park (New York County, New York)
Built 1929-34; Abandoned in 1980; Faced threats of demolition in the mid-1980s and again during the Guliani administration; Conversion into a park began in 2006; Section I opened in 2009; Section II opened in 2011; Section III Opened 2014
Park built on steel stringer bridges over city streets
Open to pedestrians only

Jakway Park Bridge (Buchanan County, Iowa)
Built 2008
Concrete deck girder bridge over East Branch Buffalo Creek on 136th Street
Open to traffic

Kite Avenue Private Drive Bridge (Daviess County, Missouri)
Bowstring-Parker-Warren hybrid pony truss bridge over Tributary of East Brushy Creek on Private Drive
Open to private traffic

Mars Hill Bridge (Wapello County, Iowa)
Built 2006
Bridge over Little Soap Creek on 100th Avenue
Open to traffic

Meramec River MO 21 Bridge (St. Louis County, Missouri)
Built 1940; rehabilitated 2010
Steel through arch bridge over the Meramec River on Tesson Ferry Road (Missouri State Highway 21) at the St. Louis / Jefferson County line
Open to four lanes of traffic

Mount Washington Cog Railway (Coos County, New Hampshire)
Built 1868
Timber stringer bridge over Ammonoosic River/Mount Washington/Several intermittent streams on Mount Washington Cog Railway
Open to traffic

Okoboji Bridge (Dickinson County, Iowa)
Built in 1909 over the strait between West and East Okoboji Lakes, replaced in 1926 but the truss span was relocated to its present spot.
Pony truss bridge over a branch of Little Sioux River on 180th Avenue
Knocked off its foundation by flooding in 2011. Bridge taken out of the river and is currently sitting at the end of a dead-end road. Future unknown.

Puente Atirantado (Naranjito, Puerto Rico)
Built 2008
Cable-stayed bridge over Río de La Plata on PR-5
Open to traffic

Snake River Bridge (Old) (Asotin County, Washington)
Built 1899; replaced 1939
Lost Through truss bridge over Snake River on US-12
Replaced by a new bridge

South St. Paul Monorail (Dakota County, Minnesota)
Built 1888; Removed ca. 1889
Lost Double-intersection Warren deck truss bridge over Bryant Street to 17th Avenue North on Monorail
Removed

Staple Bend Tunnel (Cambria County, Pennsylvania)
Built 1831-33
Tunnel on Rail Trail
Open to pedestrians only

US 41/45 Pedestrian/Bicycle Overpass (Waukesha County, Wisconsin)
Built 1970; First Cable-stayed bridge built in the United States
Cable-stayed bridge over US 41-US 45 on Water St. in Menomonee Falls
Open to pedestrians/bicycles

US20 Iowa River Bridge (Hardin County, Iowa)
Built 2003
Girder bridge over Iowa River on US 20
Open to traffic