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Pratt truss

The Pratt truss is named after Thomas and Caleb Pratt, Boston railroad engineers who patented the design in 1844. The Pratt and its variations are the most common design of metal truss bridges. On a basic Pratt truss, the diagonals slope toward the center of the bridge, do not cross any verticals, and are approximately parallel. The top chord is straight and parallels the lower chord. The panels can have sub-divisions - or verticals and diagonals that don't reach from the top to bottom chord, though this can be considered a variation of the basic type. There are many variations, or sub-types of the Pratt truss, some of which have their own name including Parker, camelback, Pennsylvania, Baltimore, and others. It is used in bridges as a through truss, pony truss, and deck truss.


"Flying" Bridge (Chickasaw County, Iowa)
Built 1876 in Otterville, IA. Moved to Fredericksburg, IA in 1998.
Pratt through truss bridge over East Wapsipinicon River on Robert Mattke Park Trail
Open to pedestrians

"Motel 6 Bridge" (Old US 34/281/Nine Bridges Road Bridge) (Hall County, Nebraska)
See posted link (http://www.fhwa.dot.gov/nediv/bridges/hall.htm)
Pratt pony truss bridge over North Channel Platte River on an abandoned alignment of US 34/281/Nine Bridges Road
Open to pedestrians only

"Venice on the Creek" Bridge (Denver County, Colorado)
Built ca. 1890 at an unknown location; relocated here in 1923
Through truss bridge over Cherry Creek with buildings inside it.
Open to pedestrians only

1.75 West Road Bridge (Sangamon County, Illinois)
history unknown, replaced in 1991
Lost Pratt through truss bridge over Lick Creek(Lake Springfield) on Iron Bridge Rd. (Formerly Boy Scout Rd.)
Replaced by a new bridge

106th Street Bridge (Cook County, Illinois)
Built 1928; rehabilitated 1998
Bascule bridge over Calumet River on 106th Street in Chicago
Open to traffic

107th Street (abandoned) Cedar Creek Bridge (Johnson County, Kansas)
Pratt through truss bridge over Cedar Creek on 107th Street (abandoned)
Closed to all traffic

10th Street Bridge (Beaver County, Pennsylvania)
Built 1891; Converted to road use 1926; Closed 1978; Removed 2001
Lost Pratt deck truss bridge over Beaver River on 10th Street
Removed

110th Street Bridge (Humboldt County, Iowa)
Built 1911 by the Iowa Bridge Co.
Through truss bridge over East Fork Des Moines River on 110th Street
Open to one-lane traffic

110th Street Bridge (Kossuth County, Iowa)
Built 1895 by the King Bridge Co.
Lost through truss bridge over East Fork Des Moines River on 110th Street between Humboldt and Algona
Removed 2016-17

11th Street Bridge (Old) (Pierce County, Washington)
(Main design: Pratt through truss)
Built 1894; Replaced 1913
Lost Pratt through truss bridge over Tacoma Narrows on East 11th Street
Replaced by a new bridge

122nd Street Bridge (Ray County, Missouri)
Built 1913, probably by the Kansas City Bridge Co.
Pony truss bridge over a branch of West Fork Crooked River on W. 122nd Street
Open to traffic

12th Street Swing Bridge (Cook County, Illinois)
Built 1886; Replaced 1928
Lost Pratt through truss bridge over South Branch Chicago River on 12th Street
Replaced by a new bridge

133rd Avenue Bridge (Allegan County, Michigan)
Built 1897 by the Michigan Bridge Co,; Replaced by new bridge in 1996; Relocated in 1999 to the Calhoun County Historic Bridge Park
Relocated Pratt pony truss bridge over Rabbit River on 133rd Avenue in Hopkins; now relocated to the Historic Bridge Park in Calhoun County and restored as a pedestrian bridge
Relocated and open to pedestrians

13th Street Bridge (Saline County, Nebraska)
Built 1925
Through truss bridge over Big Blue River on 13th Street in Crete
Open to traffic

13th Street Bridge (Allegheny County, Pennsylvania)
Built in 1892, and dismantled in 1917.
Lost Bridge over Youghiogheny River
No longer exists

13th Street South Skunk River Bridge (Story County, Iowa)
Lally column settled during flooding in 1918; Repaired shortly thereafter
Lost Truss bridge over South Skunk River on 13th Street
Replaced by new bridge

140th Avenue Bedstead Bridge (Clay County, Iowa)
Lost Bedstead Pratt pony truss bridge over Willow Creek on 140th Avenue
Removed but not replaced

145th Avenue Bridge (Kossuth County, Iowa)
Built 1900; bypassed by new bridge in 1997
Through truss bridge over East Fork Des Moines River on 145th Avenue (CH C12)
Open to pedestrians only

155th Street Pedestrian Bridge (New York County, New York)
Pratt through truss bridge over Amtrak West Side Connector on Pedestrian Path
Open to pedestrians only

16th Street Swing Bridge (Will County, Illinois)
Built 1905; removed 1993
Lost swing through truss bridge over Sanitary & Ship Canal on Division Street
Removed but not replaced

170th Road Bridge (Brown County, Kansas)
Pratt pony truss bridge over Gregg Creek on 170 Road
Open to traffic

180th Street Bridge (Story County, Iowa)
Built 1927; rehabilitated 1974; replaced 2011
Through truss bridge over South Skunk River on 180th Street Bridge
Replaced by a new bridge

180th Street Bridge (Clinton County, Iowa)
Built 1949
Pony truss bridge over Silver Creek(West) on 180th Street in Welton
Closed to all traffic

18th Street Bridge (Older) (Cook County, Illinois)
Built 1888; Replaced 1905
Lost Pratt through truss bridge over South Branch Chicago River on 18th Street
Replaced by a new bridge

1st Avenue Bridge (Old) (Linn County, Iowa)
Built 1885 ; replaced 1920
Lost Pratt through truss bridge over Cedar River on 1st Avenue
Replaced by a new bridge

1st Petit Jean Bridge (at Magazine) (Logan County, Arkansas)
Built 1909, Demolished 1982
Lost Pratt through truss bridge over Petit Jean River on AR 109 just south of Magazine
Demolished to make way for upgrade of hwy. 109

200th Avenue Bridge (Clay County, Iowa)
Pratt through truss bridge over Little Sioux River on 200th Avenue
Removed but not replaced

200th Street Bridge (Brown County, Kansas)
Pratt pony truss bridge over Wolf River on 200th Street
Open to traffic

200th Street Bridge (Howard County, Iowa)
Built 1904
Pratt pony truss bridge over Wapsipinicion River on 200th Street
Intact but closed to all traffic

218th Street Bridge (Delaware County, Iowa)
Built 1915, Replaced by a UCEB in 2013
Through truss bridge over Plum Creek on 218th Street
Replaced by a new bridge

220th Street Bridge (Adams County, Iowa)
Built ca. 1930
Through truss bridge over East Nodaway River on 220th Street in Corning
Open to traffic

280th Street Bridge (Butler County, Iowa)
Pratt through truss bridge over West Fork Cedar River on 280th Street
Intact but closed to all traffic

2nd Avenue Bridge (McHenry County, North Dakota)
Built 1921; rehabilitated 1968. Relocated here from North Dakota Highway 41 on the north edge of Velva in the 1960s.
Through truss bridge over Mouse River on 2nd Avenue in Velva
Open to traffic

2nd Petit Jean Bridge (at Magazine) (Logan County, Arkansas)
Built 1922; Bypassed by new bridge 1982
Tthrough truss bridge over Petit Jean River on Old AR 109 south of Magazine
Bypassed by modern bridge in 1982

2nd Street Bridge (Bureau County, Illinois)
Built 1899
Pony truss bridge over King Creek just west of Mineral on 2nd St (TR10B)
Open to traffic

2nd Street Bridge (Older) (Muscatine County, Iowa)
Built ca. 1884; Replaced 1917
Lost Pony truss bridge over Mad Creek on 2nd Street
Replaced by new bridge

3 Rivers Trail - Gotch Park Bridge (Humboldt County, Iowa)
Built 1899, converted for trail use in 1991
Through truss bridge over East Fork Des Moines River on the Three Rivers Bike Trail at Gotch Park near Humboldt
Open to pedestrians and bicyclists only

305th Street Lime Creek Bridge (Buchanan County, Iowa)
Built 1910
Through truss bridge over Lime Creek on 305th Street
Intact but closed to all traffic

325th Street Bridge (Delaware County, Iowa)
Built ca. 1920
Through truss bridge over Buffalo Creek on 325th Street
Abandoned; hunters still walk this bridge

325th Street Bridge (Harrison County, Iowa)
Built ca. 1920; removed after 2002
Through truss bridge over Mosquito Creek on 325th Street
Removed; road abandoned

340th Street Bridge (Clay County, Iowa)
Built 1911; Replaced 2008
Lost Pony truss bridge over Ocheyedan River on 340th Street
Replaced by a new bridge

351st Road Bridge (Miami County, Kansas)
Built 1912
Abandoned Pratt through truss bridge over Marais Des Cygnes River on 351st Road
Abandoned

370th Street Bridge (Older) (Calhoun County, Iowa)
Lost Pratt through truss bridge over Raccoon River on 370th Street
Replaced by a new bridge

39th Street Bridge (Old) (Cook County, Illinois)
Lost Pratt through truss bridge over South Fork South Branch Chicago River on 39th Street
No longer exists

3rd Avenue Iowa River Bridge (Marshall County, Iowa)
Lost Pratt through truss bridge over Iowa River on 3rd Avenue
Replaced by a new bridge

3rd Avenue Linn Creek Bridge (Older) (Marshall County, Iowa)
Built ?; Replaced 1920
Lost Pratt through truss bridge over Linn Creek on Third Street
Replaced by a new bridge

3rd Bridge (at Sugar Grove) (Logan County, Arkansas)
Built 1906 by the Joliet Bridge Co.; closed to traffic ca. 1998
Closed through truss bridge over Petit Jean River on Old AR 109 just north of Sugar Grove, 4 miles south of Magazine.
Closed to all traffic

3rd Street Bridge (Bremer County, Iowa)
Built 1917; rehabilitated 1982 and 2006
Through truss bridge over Cedar River on 3rd Street SE in Waverly
Potentially doomed if the city council has its way

3rd Street Bridge (Osceola County, Iowa)
Pratt through truss bridge over Otter Creek on 3rd Street
Replaced by a new bridge

410th Street Bridge (Sioux County, Iowa)
Built 1897 by W.W. Allen; replaced 2001
Lost through truss bridge over Floyd River on 410th Street southwest of Hospers
Replaced by a modern bridge

430th Street Bridge (Clay County, Iowa)
Built 1916
Pony truss bridge over Willow Creek on 430th Street
Open to traffic

46th Street Bridge (Ashtabula County, Ohio)
Built 1896, closed to traffic in 1981
Lost Deck truss bridge over Ashtabula River on 46th Street in Ashtabula
Replaced by new bridge

485th Avenue Bridge (Palo Alto County, Iowa)
Built ca. 1919; replaced 1999
Lost pony truss bridge over Old Channel West Fork Des Moines River on 485th Avenue just off CR B55, west of Rodman
Replaced by a modern bridge

485th Street Bridge (Clay County, Iowa)
Pratt pony truss bridge over Tributary of Little Sioux River on private road just off 485th Street
Closed to all traffic

4th Street Bridge (Emmet County, Iowa)
Lost Pratt through truss over West Fork Des Moines River on 4th Street
Replaced by a new bridge

4th Street Salt Creek Bridge (Tama County, Iowa)
Lost Pratt pony truss bridge over Salt Creek on 4th Street
Replaced by a new bridge

5th Street Bridge (Linn County, Iowa)
Lost Pratt through truss bridge over East Big Creek on 5th Street
Replaced by a new bridge

5th Street Pedestrian Walkway Bridges (Forsyth County, North Carolina)
Built 1927
1927 Truss bridge over NC 1508 on a pedestrian walkway in Winston-Salem
Open to pedestrians only

6th Avenue Bridge (Linn County, Iowa)
Replaced 1947
Lost Through truss bridge over Indian Creek on 6th Avenue
Replaced on a new alignment

6th Street West Through Truss (Plymouth County, Iowa)
Lost Pratt through truss bridge over Floyd River on 6th Street West
Lost

7th Street Bridge (Potter County, Pennsylvania)
Built 1883 at 7th Street by the King Iron Bridge Co.; reinforcement arch added 1983; relocated to 4th Street as a pedestrian bridge in 2011
Pratt through truss bridge over Allegheny River relocated to 4th Street
Open to pedestrians

8th Street Bridge (Umatilla County, Oregon)
Built 1909; rehabilitated 1955
Pin-connected Pratt through truss bridge over Umatilla River on 8th Street in Pendleton
Open to traffic

8th Street Pedestrian Bridge (Ward County, North Dakota)
Pratt through truss footbridge over Burlington Northern Santa Fe Railway on a pedestrian trail in Minot
Open to pedestrians

8th Street Tunnel Viaduct (Jackson County, Missouri)
(Main design: Pratt through truss)
Lost Pratt through truss bridge over Rail yard on Kansas City Public Service Co.
Removed

95th Street Bridge (Old) (Cook County, Illinois)
Built 1902; Replaced 1958
Lost bascule truss bridge over Calumet River on 95th Street
Replaced by a new bridge

9th Street Bridge (Roanoke, Virginia)
Built 1943
Pratt pony truss bridge over Roanoke River on 9th Street in Roanoke
Replaced by a new bridge

9th Street Bridge (Old) (Los Angeles County, California)
Built 1889; Replaced 1925
Pratt through truss bridge


A&K - New Mills Bridge (Kennebec County, Maine)
Lost Pratt through truss bridge over Cobbossecontee Stream on Androscoggin & Kennebec Railway
Removed

AA - Raisin River Bridge (Dundee) (Monroe County, Michigan)
Pratt through truss bridge over Raisin River on Ann Arbor Railroad
Open to traffic

Abandoned BMS - Pulp Mill Bridge (Coos County, New Hampshire)
Built 1921 by Berlin Construction Co.;Abandoned 2006
Abandoned bridge over Androscoggin River on Berlin Mills Railway
Derelict/abandoned

Abandoned Bridge (Marion County, Ohio)
Built c1925
Pratt through truss bridge over Little Scioto River on Hollman Road
Bypassed--Derelict/abandoned

Abandoned CN - West Twin River Swing Bridge (Manitowoc County, Wisconsin)
Built 1899
Abandoned through truss bridge over West Twin River on Abandoned
Abandoned

Abandoned CSX - Pigeon Creek Bridge (Vanderburgh County, Indiana)
Abandoned through truss bridge over pigeon creek on abandoned railroad
Abandoned

Abandoned DH (Warrensburg Branch) - Hudson River Bridge #1 (Warren County, New York)
Built 1905; Abandoned 1980
Abandoned Pin connected Pratt through truss bridge over Hudson River on Abandoned Delaware & Hudson Railroad
Derelict/abandoned

Abandoned DH (Warrensburg Branch) - Hudson River Bridge #2 (Warren County, New York)
Built 1905, abandoned 1980
Abandoned pratt through truss bridge over Hudson River on D&H Warrensburg Branch
Derelict/abandoned

Abandoned FM2854 Bridge (Montgomery County, Texas)
Built 1910; Bypassed 1968
Abandoned through truss bridge over San Jacinto River
Abandoned

Abandoned KCS - Kansas River Bridge (Wyandotte County, Kansas)
(Main design: Parker through truss)
Built 1916; abandoned 1983
Abandoned three-span through truss bridge over Kansas River on the former Kansas City Southern Railway, south of James Street
Closed to all traffic

Abandoned NS - Sohl Avenue Swing Bridge (Lake County, Indiana)
Built 1902
Abandoned through truss bridge over Grand Calumet River on Abandoned Norfolk Southern Railway
Abandoned

Abandoned NYC - Mill Creek Bridge (Ashtabula County, Ohio)
Originaly part of the Lake Shore &Michigan Southern Franklin Division High grade
Abandoned bridge over Mill Creek on Former rail line
Abandoned

Abandoned Plum River Bridge (Carroll County, Illinois)
Abandoned through truss bridge over Plum River on Abandoned road alignment
Derelict/abandoned

Abandoned Pony Truss (Wright County, Iowa)
Pratt pony truss bridge
Abandoned

Abandoned Prairie Creek Bridge (Jackson County, Iowa)
Abandoned pony truss bridge over Prairie Creek on 17th Street
Abandoned

Abandoned SP - Neches River Bridge (Jasper County, Texas)
Abandoned through truss bridge over Neches River on Railroad
Abandoned

Abandoned TSRR - Richland Creek Bridge (Giles County, Tennessee)
Abandoned pratt through truss bridge over Richland Creek on Tennessee Southern Railroad
Derelict/abandoned

Abandoned White River Bridge (Mellette County, South Dakota)
Abandoned pratt through truss bridge over White River on Abandoned A Street
Derelict/abandoned

Abbett Avenue Bridge (Morris County, New Jersey)
Built 1896; rehabilitated 1941; demolished ca. 1978; replacement bridge built 1986
Lost pony truss bridge over Whippany River on Abbett Avenue in Morristown
Replaced by new bridge

Abbey Avenue Viaduct (Cuyahoga County, Ohio)
Built 1888 by the King Bridge Co.
Lost Pratt deck truss bridge over Walworth Valley Run and Nickle Plate/Big Four Railroad on Abbey Ave
Replaced by new bridge

Abbotts Creek Bridge (Davidson County, North Carolina)
(Main design: Parker through truss)
Built 1927 by the Virginia Bridge Co.; replaced 1985
Lost Parker truss bridge over Abbotts Creek (High Rock Lake) on NC-2294
Lost circa 1985

Abel Hill Bridge (Martin County, Indiana)
Built in 1877 by the Columbia Bridge Works; replaced in 1996.
Lost Pratt through truss bridge over Lost River on CR #3
Replaced by new bridge

Abiaca Creek Bridge (Carroll County, Mississippi)
Built ca. 1930
Through truss bridge over Abiaca Creek on Nebo Rd.
Open to traffic

Achmun Creek Bridge (Yell County, Arkansas)
Built ca. 1920
Through truss bridge over Achmun Creek on Mickles Switch Road (CR 49/Old AR 10) northwest of Ola
Open to one-lane traffic

Ackelson Bridge (Washington County, Pennsylvania)
Built 1904
Pony truss bridge over Little Raccoon Run on TR 506
Open to traffic

Ackerman Creek-Tumbleweed Rd. Bridge (Marshall County, Kansas)
Built ca. 1930
Pony truss bridge over Ackerman Creek on Tumbleweed Road, 1.5 mi. west of Vliets
Open to traffic

Adair County Road 16 Bridge (Adair County, Missouri)
Built ca. 1960
Through truss bridge over Blackbird Creek on Grapevine Road
Open to traffic

Adams Street Bridge (Cook County, Illinois)
Built 1927; rehabilitated 1996 and 2017
Bascule bridge over South Branch Chicago River on Adams Street (former westbound US 66) in Chicago
Open to traffic

Adams Street Bridge (Mason County, Illinois)
lost 3 span Pratt Through Truss Bridge
Lost Pratt through truss bridge over Illinois River in Havana
Replaced by new bridge

Adams Street Bridge (Wise County, Virginia)
Built unknown
Half-hip Pratt pony truss bridge over old Interstate railbed on pedestrians
Open to pedestrians

Adams Street Swing Bridge (Cook County, Illinois)
(Main design: Camelback through truss)
Built 1889 to replace earlier 1869 swing bridge; replaced 1927
Lost Camelback through truss bridge over Chicago River (south branch) on Adams Street
Replaced by a new bridge

Adamsboro Bridge (Cass County, Indiana)
Built in 1898 by the Wabash Bridge & Iron Works, replaced in 1985.
Lost through truss bridge over Eel River on CR 150 N in Adamsboro
Replaced by new bridge

ADBF - Raisin River Bridge (Adrian) (Lenawee County, Michigan)
Pratt deck truss bridge over Raisin River on Adrian & Blissfield Railroad
Open to traffic