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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.


BNSF - Puyallup River Bridge (Pierce County, Washington)
Pratt through truss bridge over Puyallup River on Railroad (BNSF)
Open to traffic

BNSF - Rainbow Falls Bridge (Cascade County, Montana)
Built 1901
Pratt deck truss bridge over Missouri River on BNSF Railroad
Open to traffic

BNSF - Red Lake River Bridge (Polk County, Minnesota)
Built 1892, Second Span Added 1906, 1892 Span Removed Date Unknown
Pratt Through Truss Bridge over Red Lake River in Crookston
Open to traffic

BNSF - Red River Bridge (Love County, Oklahoma)
Construction Began 1902, Completed 1909
Six span Pratt Through truss bridge over Red River on BNSF Railway
Open to traffic

BNSF - Rock Creek Bridge (Skamania County, Washington)
Pratt through truss bridge over Rock Creek on Railroad (BNSF)
Open to traffic

BNSF - S&S Canal Bridge (Cook County, Illinois)
Built 1898
Two track Pratt through truss bridge over Sanitary & Ship Canal on BNSF (former Santa Fe) Railroad
Open to traffic

BNSF - Saline Creek Bridge (Ste. Genevieve County, Missouri)
Through truss railroad bridge over Saline Creek parallel to US 61 north of St. Mary
Still in use

BNSF - Salt Creek Bridge (Ashland West) (Saunders County, Nebraska)
Built Ca. 1908, Approaches Rebuilt 1952; Replaced 2018
Pratt through truss bridge over Salt Creek on BNSF Railway
Replaced by a new bridge

BNSF - Salt Fork Bridge (Kay County, Oklahoma)
Built 1899; Replaced 2014
Pratt through truss bridge over Salt Fork Arkansas River on BNSF Railway (former Santa Fe Railroad)
Replaced by a new bridge

BNSF - Salt River Bridge (Shelby County, Missouri)
Pratt deck truss bridge over Salt River on BNSF Railway
Open to traffic

BNSF - San Joaquin River Bridge (Madera County, California)
Built 1910
Deck truss bridge over San Joaquin River on BNSF Railway
Open to traffic

BNSF - Skunk River Bridge (Henry County, Iowa)
Built 1899
Pratt deck truss bridge over Skunk River on BNSF Railway
Open to traffic

BNSF - Skunk River Bridge (Des Moines County, Iowa)
Built 1910
Through truss bridge over Skunk River on BNSF Railway
Open to traffic

BNSF - St. Cloud Crossing (Stearns County, Minnesota)
Built in 1892 as part of the Great Northern Railroad. Rehabilitated in 1922. Changed hands in 1970, 1996, and again in 2000. Still serves traffic as part of a short line going through St. Cloud
Pratt deck truss bridge over Mississippi River on BNSF Railroad
Open to traffic

BNSF - Stanislaus River Bridge (Stanislaus County, California)
Built 1905, Truss span replaced with deck girder ca. 1995
Lost Pratt through truss bridge over Stanislaus River on BNSF Railway


BNSF - Stillaguamish River Bridge (Snohomish County, Washington)
Pratt through truss bridge over Stillaguamish River on BNSF Railway
Open to traffic

BNSF - Terry Overpass (Prairie County, Montana)
Built 1907
Pratt pony truss bridge over Railroad (BNSF) on Railroad (BNSF)
Open to traffic

BNSF - Toutle River Bridge (Cowlitz County, Washington)
Built 1908
Pratt through truss bridge over Toutle River on B.N.S.F. Railroad
Open to traffic

BNSF - Twin Crossing Bridge No 1 (Wasco County, Oregon)
Built 1911
Pratt deck truss bridge over Deschutes River
Open to traffic

BNSF - Victorville Bridge (San Bernardino County, California)
Built 1914, Warren Span added 1921
Pratt through truss bridge over Mojave River on BNSF Railroad
Open to traffic

BNSF - Wakadena Creek Bridge (Carroll County, Missouri)
Built 1907, Approaches Rebuilt 2011
Pratt Through truss bridge over Wakenda Creek on BNSF Railway
Open to traffic

BNSF - Walnut River Bridge (S) (Cowley County, Kansas)
Built 1904, Parallel Span added 1919, Approaches Rebuilt 1922; 1919 Span Removed 19xx
Pratt Through truss bridge over Walnut River on BNSF Railway
Open to traffic

BNSF - Walnut River Bridge (W) (Cowley County, Kansas)
Built 1905, Second Track added 1919; North Approach Rebuilt Ca. 2003
Pratt through truss bridge over Walnut River on BNSF Railway
Open to traffic

BNSF - Washougal River Bridge (Old) (Clark County, Washington)
Built 1908; Replaced 2017
Pratt through truss bridge over Washougal River on Railroad (BNSF)
Replaced by a new bridge

BNSF - White Salmon River Bridge (Skamania County, Washington)
Built 1911
Pratt through truss bridge over White Salmon River on Railroad (BNSF)
Open to traffic

BNSF - Wind River Bridge (Skamania County, Washington)
Erected ca. 1919, replaced wih new span August 2019
Pratt through truss bridge over Wind River on Railroad (BNSF)
Replaced by a new bridge

BNSF - Yellowstone River Bridge (Yellowstone County, Montana)
Bridge over Yellowstone River on Railroad
Open to traffic

Board Camp Creek Bridge (Polk County, Arkansas)
Built 1915
Pony truss bridge over Board Camp Creek on CR 657
Reopened

Boardwalk Bridge (Linn County, Missouri)
Pratt through truss bridge over Locust Creek on a pedestrian trail in Pershing State Park
Open to pedestrians only

Boat Dock Road Bridge (Madison County, Alabama)
Built 1925
Through truss bridge over Aldridge Creek on Boat Dock Road in Huntsville
Closed to traffic

Bob Moore Senior Bicycle Bridge (Floyd County, Georgia)
Dedicated to the memory of Robert L. (Bob) Moore, Sr., Rome native and bicycle shop owner
Pratt through truss bridge over Etowah River in Rome, Georgia
Open to pedestrians only

Bobby Woodman Trail - Sugar River Bridge (Sullivan County, New Hampshire)
Pratt through truss bridge over Sugar River on the Bobby Woodman Trail
Open to pedestrians

Bobtown Bridge (Webster County, Iowa)
Built 1876; Replaced 1919
Lost Pratt through truss bridge over Des Moines River on Hawkeye Avenue
Replaced by a new bridge

Bobtown Mine Railroad Bridge #3 (Greene County, Pennsylvania)
Abandoned pratt through truss bridge over Dunkard Creek on Bobtown Mine Railroad
Abandoned

Bodines Bridge (Lycoming County, Pennsylvania)
Built 1890 by E.A. Perkins & Co.; replaced 1991
Lost through truss bridge over Lycoming Creek on SR 1006
Replaced by new bridge

Boeuf River US 82 Bridge (Chicot County, Arkansas)
Replaced 1950
Lost pony truss bridge over Boeuf River on US 82
No longer exists

Boggs Creek Bridge (Martin County, Indiana)
Built 1897; replaced 2005
Lost pony truss bridge over Boggs Creek on CR 400 North (CR66)
Replaced by new bridge

Boggy Creek Bridge (Rogers County, Oklahoma)
Abandoned pratt through truss bridge over Boggy Creek on former alignment of Keetonville Rd
Derelict/abandoned

Bogle Road Bridge (Warren County, Kentucky)
Lost pony truss bridge over R J Corman Railroad on Bogle Road
Replaced by a new bridge

Bohemian Highway Bridge (Sonoma County, California)
Built 1934
Pratt Pony truss bridge over Russian River on Bohemian Highway in Monte Rio
Open to traffic

Bois D'Arc Bridge (Butler County, Kansas)
Built 1885
Through truss bridge over Little Walnut River, 3.8 mi. east and 0.5 mi. north of Gordon
Closed. Formerly open to traffic with a 6'6" height restriction.

Bois D'Arc Creek Bridge (Kay County, Oklahoma)
Built ca. 1940; replaced 2014
Lost pony truss bridge over Bois D'Arc Creek on E0130
Replaced by a new bridge

Bois D'Arc Creek Bridge (Kay County, Oklahoma)
Built ca. 1930; replaced 2013
Lost pony truss bridge over Bois D'Arc Creek on W. Peckham Road (3618C)
Replaced by a new bridge

Boise River Greenbelt - 9th Street Bridge (Ada County, Idaho)
Built 1911; Converted to pedestrian use 1988
Pratt through truss bridge over Boise River on Boise River Greenbelt (an old alignment of 9th Street)
Open to pedestrians

Boise River Greenbelt - Boise River Bridge (Ada County, Idaho)
Built 1923
Pratt through truss bridge over Boise River on the Boise River Greenbelt (Old Railroad Bridge)
Open to pedestrians

Bolckow Bridge (Andrew County, Missouri)
Lost through truss bridge over One Hundred and Two River near Bolckow
No longer exists

Bolivia Road Bridge (Sangamon County, Illinois)
(Main design: Parker through truss)
Built 1901
Through truss bridge over Sangamon River on Bolivia Road (TR 518)
Intact but closed to all traffic

Bolley Ditch CR 1400N Bridge (Miami County, Indiana)
Built ca. 1905
Lost Pratt pony truss bridge over Bolley Ditch on County Road 1400 North
Replaced by a new bridge

Bonaparte Bridge (Van Buren County, Iowa)
Built 1877, Replaced 1960
Lost Pratt through truss bridge over Des Moines River on Road
Replaced by a new bridge

Bones Creek Bridge (Bates County, Missouri)
Built 1911 by the Vincennes Bridge Co.; replaced 2001
Lost two-span pony truss bridge over Bones Creek on Whoopie Road (3502 Road)
Replaced by new bridge

Bonnell Bridge (Dearborn County, Indiana)
Built in 1914 by the Oregonia Bridge Company, replaced 1999
Lost Pratt through truss bridge over West Fork Tanners Creek on Konradi Road
Replaced by a new bridge

Bonnie Doon Crossing (Lyon County, Iowa)
Abandoned pratt through truss bridge over Rock River on Grant Avenue
Abandoned

Bonpas Creek Bridge (Richland County, Illinois)
Built ca. 1909
Pony truss bridge over Bonpas Creek on TR 261, 2.25 mi. northwest of Berryville.
Open to traffic

Book Road Bridge (Butler County, Pennsylvania)
Built ca. 1895
Pony truss bridge over Muddy Creek on Book Road (TR 348)
Open to traffic

Boom Island Pedestrian Bridge (Hennepin County, Minnesota)
Built 1901, Converted to pedestrian usage in 1987; Rehabilitated 2018
Pratt through truss bridge over Back Channel of Mississippi River on Pedestrian trail
Open to pedestrians

Boomer Creek Bridge (Payne County, Oklahoma)
Built 1927; replaced 2010
Lost pony truss bridge over Boomer Creek on E0630 in Stillwater
Replaced by a new bridge

Boone Bridge (Boone County, Iowa)
(Main design: Parker through truss)
Built 1928; replaced 2000
Lost Parker through truss bridge over Des Moines River on Lincoln Highway
Replaced by a new bridge

Boone Cemetery Bridge (Sullivan County, Indiana)
Built 1896; replaced 1989
Lost Pratt through truss bridge over Busseron Creek on CR 500 South
Replaced by new bridge

Boone Creek Bridge (Bourbon County, Kentucky)
Built 1913
Pratt Through Truss over Boone Creek on Cr-01111-0
Derelict/abandoned

Booths Creek Bridge (Marion County, West Virginia)
Built 1888
Pony truss bridge over Booths Creek on CR 73/16
Open to traffic

Borman Bridge (Cherry County, Nebraska)
Built 1916 by the Canton Bridge Co.
Through truss bridge over Niobrara River on Road 220, 1 mi. east and 1 mi. south of Valentine
Open to traffic

Bormann Bridge (Humboldt County, Iowa)
Built ca. 1900
Through truss bridge over Des Moines River on 130th Avenue
Open to traffic

Boscobel Covered Bridge (Grant County, Wisconsin)
(Main design: Pratt through truss)
Built 1874; Replaced 1936
Lost Pratt through truss bridge over Wisconsin River on US 61
Replaced by a new bridge

Bottom Road Bridge (Baltimore County, Maryland)
Built 1886; rehabilitated 2001
Through truss bridge over Little Gunpowder Falls on Bottom Road
Open to traffic

Boulder Creek Bridge (Maricopa County, Arizona)
(Main design: Parker through truss)
Built 1937
4-span through truss bridge over Boulder Creek on AZ 88
Open to traffic

Bourbeuse River Twin Bridges (Franklin County, Missouri)
EB replaced built 1925, replaced 1959, WB built 1935, carried service road 1959-1973
Lost pair of through truss bridges over Bourbeuse River on US 66 (now I-44)
Replaced by new bridge

Bowen Mill Bridge (Richland County, Wisconsin)
Built across the Wisconsin River at Spring Green in 1907; Relocated here in 1966; Replaced 1994
Lost Pratt through truss bridge over Pine River on CTH AA in Richland Center
Unknown. Replaced by new bridge in 1994

Bowers Bridge Road Bridge (York County, Pennsylvania)
Built 1889 by Wrought Iron Bridge Co.; rehabilitated 1954
Lost through truss bridge over Little Conewago Creek on Bowers Bridge Road
Repalced by concrete slab

Bowman Road Bridge (Knox County, Indiana)
Built ca. 1905 by the Canton Bridge Company; replaced 1991
Lost through truss bridge over Black Creek on Bowman Road (CR 1500E)
Replaced by new bridge

Bowmans Creek Bridge (Wyoming County, Pennsylvania)
Built ca. 1900; rehabilitated ca. 1950
Through truss bridge over Bowmans Creek on TR 413
Replaced by a new bridge

Box Elder Creek Bridge (Petroleum County, Montana)
Built 1930
Pony truss bridge over Box Elder Creek on CR 015
Open to traffic

Boxelder Creek Bridge (Pennington County, South Dakota)
Built ca. 1920; replaced 2002
Nearly lost through truss bridge over Boxelder Creek on Base Line Road, 1.0 mi. west and 3.8 mi. south of Wasta
Relocated 100 yards ESE of former location and partly dismantled

Boy Scout Camp Road Bridge (Peoria County, Illinois)
Built 1952, replaced 2016
Lost pony truss bridge over Dickison Run on Boy Scout Camp Road in Peoria
Replaced with box culvert

Boyds Creek Bridge (Chambers County, Alabama)
Built 1935
Pony truss bridge over Boyds Creek on CR 94
Open to traffic

Boyer Crossing Bridge (McKean County, Pennsylvania)
Built ca. 1910; rehabilitated 2001; replaced 2009
Lost Pratt through truss bridge over Allegheny River on TR 414
Replaced by a new bridge

Boylston Street - Boston & Albany Railroad Bridge (Suffolk County, Massachusetts)
Redecked with asphalt 1939; replaced ca. 1965
Lost Pratt pony truss bridge over Boston & Albany Railroad on Boylston Street
Replaced by a new bridge

BPRR - Redbank Creek Viaduct (Jefferson County, Pennsylvania)
(Main design: Pratt through truss)
Pratt through truss bridge over Red Bank Creek/Buffalo & Pittsburgh Railroad on Buffalo & Pittsburgh Railroad
Open to traffic

BPRR - South Fork Pine Creek Truss #1 (Armstrong County, Pennsylvania)
Through truss bridge over South Fork Pine Creek on Buffalo & Pittsburgh Railroad
Open to traffic

BPRR - South Fork Pine Creek Truss #2 (Armstrong County, Pennsylvania)
Pratt through truss bridge over South Fork Pine Creek on Buffalo & Pittsburgh Railroad
Open to traffic

BPRR - Thru-Deck Bridge (Jefferson County, Pennsylvania)
Through and deck truss bridge over Mahoning Creek on BR&P Railway Line in Punxsutawney
Open to traffic

Bracht Ditch Bridge (Adams County, Indiana)
Pratt pony truss bridge over Bracht Ditch on Private lane.
Might still be in limited use on a private farm lane.

Bradford Bridge (Bracken County, Kentucky)
Abandoned pony truss bridge over Little Snag Creek
Abandoned

Bradford Lake Bridge (White County, Arkansas)
Lost through truss bridge over Bradford Lake (Departee Creek) on Lake Road, east of Bradford
No longer exists

Bradford-Bloomer Road Bridge (Miami County, Ohio)
Built 1945; rehabilitated 1991
Through truss bridge over Stillwater River on Bradford-Bloomer Road (CR 86)
Demolished

Bradley Bridge (Callaway County, Missouri)
Built 1885 by the Missouri Valley Bridge & Iron Co.; replaced 2003
Lost through truss bridge over Auxvasse Creek on CR 428 southeast of Fulton
Replaced by modern bridge

Brady Bridge (Somerset County, Pennsylvania)
Built ca. 1905
Pony truss bridge over Stony Creek on TR 515
Open to traffic

Branch Avenue Bridge (Providence County, Rhode Island)
Replaced ca. 1984
Lost Pratt through truss bridge over Northeast Corridor (Amtrak) on Branch Avenue
Replaced by new bridge

Branch Beaver Creek (Martin County, Indiana)
Built 1898; Replaced 1990
Lost Bedstead Pratt pony truss bridge over Branch Beaver Creek on Red School Road
Replaced by a new bridge

Branch Black Vermillion Bridge (Marshall County, Kansas)
Built ca. 1910
Pony truss bridge over a branch of Black Vermillion River, 8.0 mi. south and 5.5 mi. west of Frankfort
Open to traffic

Branch Black Vermillion River-Utah Rd. Bridge (Marshall County, Kansas)
Built ca. 1910
Pony truss bridge over a branch of Black Vermillion River, 1.5 mi. south and 0.5 mi. east of Vermillion
Open to traffic

Branch Bridge (Calhoun County, Alabama)
This bridge has been replaced with a pony truss Pratt camelback
Pratt pony camelback truss bridge over Branch on Wellington Road
Open to traffic

Branch Busseron Creek Bridge (Sullivan County, Indiana)
Built 1903; replaced 1987
Lost Bedstead Pratt pony truss bridge over Branch Busseron Creek on CR 150 W
Replaced by new bridge

Branch Busseron Creek Bridge (Sullivan County, Indiana)
Built 1903; replaced 1992
Lost Bedstead Pratt pony truss bridge over Branch Busseron Creek on CR 250 W
Replaced by culvert

Branch Canville Creek Bridge (Neosho County, Kansas)
Built 1903 by A. M. Blodgett, Kansas City, MO
Pony truss bridge over a branch of Canville Creek on 3-18.4 Local, 3.4 mi. east and 1.0 mi. north of Odense
Intact but closed to all traffic

Branch Crooked Creek Bridge (Jefferson County, Kansas)
Lost pony truss bridge over a branch of Crooked Creek on Saline Road, 2.3 mi. south and 3.0 mi. east of Nortonville
Lost

Branch Delaware River Bridge (Atchison County, Kansas)
Built 1933
Two span Pratt pony truss bridge over Nebo Creek, 1.1 mi. south and 1.0 mi. west of Arrington
Open to traffic

Branch Deleware River Bridge (Atchison County, Kansas)
Built ca. 1920
Pony truss bridge over a branch of Delaware River, 3.0 mi. north and 0.2 mi. east of Arrington
Open to traffic

Branch Gypsum Creek Bridge (McPherson County, Kansas)
Built 1912
Two-panel bedstead Pratt pony truss bridge over a branch of Gypsum Creek on Sioux Road, 1.0 mi. south and 0.6 mi. west of Roxbury
Intact but closed to all traffic

Branch Limestone Creek Bridge (Mitchell County, Kansas)
Built 1905
Pony truss bridge over Limestone Creek, 1.4 mi. west and 4.5 mi. north of Glen Elder
Open to traffic

Branch Little Pigeon Creek CR 1075 N (Spencer County, Indiana)
Built ca. 1905
Lost Pratt pony truss bridge over Branch Little Pigeon Creek on CR 1075 N, CR 200
Replaced by a new bridge