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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.


North Umpqua River Bridge (Douglas County, Oregon)
Built 1955, Replaced 2010
Pratt through truss bridge over North Umpqua River on Soda Springs Road
Replaced by a new bridge in 2010

North Wea Creek Bridge (Miami County, Kansas)
Built ca. 1910
Pony truss bridge over North Wea Creek, 4.3 mi. west and 2.0 mi. north of Louisburg
Open to traffic

North Wea Creek Private Drive Bridge (Miami County, Kansas)
Through truss bridge over North Wea Creek on a Private Drive
Open to traffic (on a private drive)

North Wyaconda River Route H Bridge (Scotland County, Missouri)
Built 1939
Pony truss bridge over North Wyaconda River on Route H
Closed to Traffic

Northern Avenue Bridge (Suffolk County, Massachusetts)
(Main design: Pratt through truss)
Built 1908, rehabilitated 1979, closed to vehicles 1997, closed to pedestrians 2014
Pratt through truss bridge over Fort Point Channel on Northern Avenue
Intact but closed to all traffic

Northern Pacific Bridge #9 (Hennepin County, Minnesota)
Built 1922, Using rebuilt 1885 Trusses
Pratt deck truss bridge over Mississippi River on Northern Pacific Railroad (now pedestrian trail) in Minneapolis
Open to pedestrians

Northport Bridge (Old) (Stevens County, Washington)
(Main design: Baltimore through truss)
Built 1897; Coverted to road use 1921-22; Condemned & closed October 5th, 1946, Collapsed 1949
Lost Through truss bridge over Columbia River on WA 25 (Former Columbia & Red Mountain Railroad)
Collapsed

Northwest Boulevard Pedestrian Bridge (Forsyth County, North Carolina)
Built ca1940
Ca.1940 through truss bridge over Northwest Blvd on Pedestrian


Norwood Creek Bridge (McCurtain County, Oklahoma)
Built 1948; replaced 2005
Lost through truss bridge over Norwood Creek on OK 87
No longer exists

Norwood River Bridge (Washakie County, Wyoming)
Bypassed 1981
Pony truss bridge over Norwood River on Old Lower Norwood Road


NP - Heart River Bridge (Morton County, North Dakota)
Washed out in 1948 flood
Lost Pratt through truss bridge over Heart River on Northern Pacific Railroad
Destroyed by flooding; replaced

NP - Skagit River Bridge (Skagit County, Washington)
(Main design: Warren through truss)
Built 1913
Abandoned warren through truss bridge over Skagit River on Former Northern Pacific Railroad
Abandoned

NP - Yellowstone River Bridge (Park County, Montana)
Built 1897, Relocated here 1918
Pratt through truss bridge over Yellowstone River on Abandoned Northern Pacific Line
Closed to all traffic

NP - Yellowstone River Bridge (Old) (Yellowstone County, Montana)
Built 1881; Replaced 1922
Pratt through truss bridge over Yellowstone River on Northern Pacific Railroad
Replaced by a new bridge

NRM - South Fork Snoqualmie River Bridge (King County, Washington)
Built 1891 crossing the Elkstone River in Montana; Moved here 1923-4, Rehabbed 2003-4
Pratt through truss bridge over South Fork Snoqualmie River on Railroad
Open to traffic

NS - Biddles Island Bridge (S) (Cass County, Indiana)
Built 1882; Replaced 1998
Lost through truss bridge over Wabash River fork on Norfolk Southern Railway (Norfolk and Western, Wabash Railroads) in Logansport
Replaced

NS - Catawba River Bridge (York County, South Carolina)
Built 1917
Pratt deck truss bridge over Catawba River on Norfolk Southern Railway - Charlotte-Columbia Subdivision
Open to traffic

NS - Cincinnati Junction Bridge (Scioto County, Ohio)
Through truss bridge over Scioto River on Norfolk Southern Railway in Portsmouth
Open to traffic

NS - Cincinnati Pike Overpass (Montgomery County, Ohio)
Pratt through truss bridge over Dayton Cincinnati Pike on Norfolk Southern Railway
Open to traffic

NS - Clinch River Bridge (Scott County, Virginia)
Built 1909 by the Virginia Bridge & Iron Co.
Pratt through truss bridge over Clinch River on Norfolk Southern Railway in Clinchport
Open to traffic

NS - Codorus Creek Bridge (N) (York County, Pennsylvania)
Currently unknown
Pratt through truss bridge over Codorus Creek
Limited rail traffic

NS - Congaree River Bridge (Richland County, South Carolina)
(Main design: Warren through truss)
Through truss bridge over Congaree River on Norfolk Southern
Open to traffic

NS - Cross Creek Bridge (Brooke County, West Virginia)
Pony truss bridge over Cross Creek on Norfolk Southern Railway
Open to traffic

NS - Delaware River Bridge (S) (Northampton County, Pennsylvania)
Fishbelly deck truss bridge over Delaware River on Norfolk Southern Railway
Open to traffic

NS - East Pearl River Bridge (Pearl River County, Mississippi)
Built 1906
Through truss bridge over Pearl River on Norfolk Southern Railway
Open to traffic

NS - Elk River Bridge (Kanawha County, West Virginia)
(Main design: Warren through truss with all verticals)
Warren through truss with all verticals bridge over Elk River onRailroad (NS)
Open to traffic

NS - Five Points Bridges (Hamilton County, Tennessee)
Bridges over South Chickamauga Creek in Chattanooga


NS - Grand River Swing Bridge (Kent County, Michigan)
Built 1901-1903 by American Bridge Co. and Detroit Bridge and Iron Works, northernmost span replaced 1908, southernmost span replaced 1922
Pratt through truss bridge over Grand River on Norfolk Southern RR (formerly Pere Marquette RR)
Open to traffic

NS - Lehigh River Bridge (Northampton County, Pennsylvania)
(Main design: Pratt through truss)
Built 1897; Two trusses (One deck, one through) lost to flooding 1902; Pinned Pratt through truss Built Late 1902: Rveted Warren Deck Truss Built 1903
Through truss bridge over Lehigh Rive & 3rd Street on Railroad
Open to traffic

NS - Little River Bridge (Blount County, Tennessee)
Built 1900 by the Edge Moor Bridge Works
Pratt through truss bridge over Little River on Norfolk Southern Railway
Open to traffic

NS - Lower Shellpot Bridge (New Castle County, Delaware)
Built 1888
Pratt through truss bridge over Christina River on Norfolk Southern Railway
Open to traffic

NS - Maumee River Bridge (New Haven) (Allen County, Indiana)
Pratt through truss bridge over Maumee River on Norfolk Southern RR
Open to traffic

NS - Ohio Connecting Railroad Bridge (Allegheny County, Pennsylvania)
(Main design: Pennsylvania through truss)
Built in 1915 replacing a single-track wide span built in 1890
Pennsylvania through truss bridge over Ohio River and Brunot's Island on Norfolk and Southern RR
Open to traffic

NS - Portage Viaduct (3rd) (Wyoming County, New York)
Built 1903 reusing 1875 substructure; rehabilitated 1944; bypassed with new bridge and abandoned Dec. 2017; demolition begun Jan. 2018.
Deck truss bridge over Genesee River on Norfolk Southern Railway north of Portageville


NS - Potomac River Bridge (Shepherdstown) (Jefferson County, West Virginia)
Built 1904
Deck truss bridge over Potomac River on Norfolk Southern Railway in Shepherdstown
Open to traffic

NS - Sinnemahoning Creek Bridge (W) (Clinton County, Pennsylvania)
Three-span through truss bridge over Sinnemahoning Creek and Keating Mountain Rd. on Norfolk Southern Railway
Open to traffic

NS - Staunton River Bridge (Campbell County, Virginia)
Pratt deck truss bridge over Staunton River on Norfolk Southern Railway
Open to traffic

NS - Susquehanna River Bridge (Selinsgrove) (Snyder County, Pennsylvania)
Built 1888-1892 to replace 1871 wooden bridge, opened 1890, altered 1901, 1925, 1930 rebuilt 1947 with truss reinforcements; one pier rebuilt after flood damage in 1972
12-span Through truss bridge over North Branch Susquehanna River on Norfolk Southern Railroad (former Pennsylvania RR)
Open to traffic

NS - Tennessee River Bridge (Knoxville) (Knox County, Tennessee)
Built piers Pre-Civil War, covered wood main span completed 1867, steel pin joints installed 1903
Pratt through truss bridge, with Warren deck truss approaches over Tennessee River, Neyland Drive on Norfolk Southern Railroad
Open to traffic

NS - Upper Shellpot Bridge (New Castle County, Delaware)
Built 1888; Rehabilitated 2003;
Pratt through truss bridge over Christina River on Norfolk Southern Railway
Open to traffic

NS - West Fork Pearl River Swing Bridge (St. Tammany Parish, Louisiana)
Railroad swing bridge over Pearl River, West Fork navigation channel on Norfolk Southern Railroad
Open to traffic

NS - West Fork White River Bridge (Delaware County, Indiana)
Unknown
Pratt through truss bridge over West Fork White River on Norfolk Southern Railway


NS - Wildcat Creek Bridge (Howard County, Indiana)
Unknown builder, replaced covered bridge formerly at this location. This bridge survived the great flood of 1913 due to Lake Erie and Western Railroad loading bridge down with loaded coal cars.
Pratt through truss bridge over Wildcat Creek on former IMC Nickel Plate line
Preserved as a landmark while trail on old rail corridor crosses MOB next to it

NS - Yellow Breeches Creek Bridge (Leidighs) (Cumberland County, Pennsylvania)
Bridge over Yellow Breeches Creek on P&R Railroad


NS Overpass (Lehigh County, Pennsylvania)
Pratt through truss bridge over Norfolk Southern Railway on Norfolk Southern Railway
Open to traffic

NS Overpass (Roanoke County, Virginia)
Built 1907
Pratt through truss bridge over Railroad (NS) on Railroad (NS)
Open to traffic

NS Susquehanna River Island Bridge (Selinsgrove) (Snyder County, Pennsylvania)
Built 1892, rebuilt with strengthened trusses ca. 1947
Four-span through truss bridge over Susquehanna River on Norfolk Southern Railroad (former Pennsylvania RR)
Open to traffic

NS/CSX Overpass (Houston County, Alabama)
Pratt through truss bridge over CSX on Norfolk Southern Railway
Open to traffic

Nueces River Bridge (Dimmit County, Texas)
Built ca. 1910; replaced 2001
Through truss bridge over Nueces River on Diamond H Ranch Road
Stripped to the frame and abandoned in Valley Wells Cemetary

Nugents Road Bridge (Linn County, Iowa)
Built 1904; rehabilitated 1990; Replaced 2014
Lost Through truss bridge over Buffalo Creek on Nugents Road
Replaced by a new bridge

NW 2211 Road Bridge (Bates County, Missouri)
Built 1906 by the Kansas City Bridge Co.; replaced 2008
Lost through truss bridge over Miami Creek on NW 2211 Road, southwest of Butler
Replaced by new bridge

NW 250th Rd Bridge (Johnson County, Missouri)
Abandoned pony truss bridge over South Fork Blackwater River on NW 250th Rd
Derelict/abandoned

NW 80th Road Bridge (Barton County, Missouri)
Built ca. 1890 by the Missouri Valley Bridge & Iron Co.; probably later relocated here
Pony truss bridge over a branch of Dry Wood Creek on NW 80th Road
Open to traffic with a 5 ton weight limit

NWP - Alderpoint Bridge (Humboldt County, California)
Built 1913 by the American Bridge Co.
Through truss bridge over Eel River on Northwestern Pacific Railroad (NWP)
Closed to all traffic

NWP - Cain Rock Bridge (Humboldt County, California)
Built 1910; Spans lost during 1964 flood and repalced.
Pratt and Warren through truss bridge over Eel River on Northwestern Pacific Railroad (NWP)
Closed to all traffic

NWP - Keys Creek Bridge (Marin County, California)
Removed ca. 1907
Pratt through truss bridge over Key's Creek on Northwestern Pacific Railroad
Removed

NWP - Van Duzen River Bridge (Humboldt County, California)
Built 1913
Pratt through truss bridge over Van Duzen River on Eureka Southern Railroad
Closed to all traffic

NYC - Black River Canal Bridge (Old) (Lewis County, New York)
Lost Pratt through truss bridge over Black River Canal on New York Central Railroad
Replaced by a new bridge

NYC - DePue Swing Bridge (Bureau County, Illinois)
(Main design: Warren through truss)
Lost Polygonal Warren through truss bridge over Illinois River on New York Central Railroad/Chicago, Milwaukee, St. Paul & Pacific Railroad
No longer exists

NYC - Gauley River Bridge (Fayette County, West Virginia)
Abandoned through truss bridge over Gauley River on former New York Central Railroad
Abandoned

NYC - Harlem River Bascule Bridge (New York County, New York)
Built 1867; Replaced 1897
Lost Pratt through truss bridge over Harlem River on Metro North RR
Replaced by a new bridge

NYC - Harlem River Swing Bridge (New York County, New York)
Built 1896; Replaced 1954
Lost Pratt through truss bridge over Harlem River on New York Central Railroad
Replaced by a new bridge

NYC - Iroquois River Bridge (Newton County, Indiana)
Built 1905 by the American Bridge Company
Pratt through truss bridge over Iroquois River on New York Central Railroad
Abandoned

NYC - Maiden Lane Bridge (Old) (Albany County, New York)
(Main design: Whipple through truss)
Built 1872; Replaced 1899
Lost Whipple through truss bridge over Hudson River on New York Central Railroad
Replaced by a new bridge

NYC - Raisin River Bridge (Lenawee County, Michigan)
Replaced 1907
Lost Pratt through truss bridge over Raisin River on New York Central Railroad
Replaced by a new bridge

NYLB - Raritan River Bridge (Old) (Middlesex County, New Jersey)
(Main design: Whipple through truss)
Built 1875; Replaced 1908
Lost Post through truss bridge over Raritan River on New York & Long Branch Railroad
Replaced by a new bridge

NYSW - Tusten Station Bridge (Sullivan County, New York)
Built 1904
Through truss bridge over Delaware River on Central New York Railroad


O Road Little Nemaha River Bridge (Otoe County, Nebraska)
Built 1895
Pratt through truss bridge over North Fork Little Nemaha River on CR-O, 1 mi. south of Lorton
Open to traffic, 3 to 6 ton weight limit

O&BSL - Dunbar Creek Bridge (Fayette County, Pennsylvania)
Mostly removed and abandoned deck truss bridge over Dunbar Creek on Railroad
Mostly removed and abandoned

O'Neal Bridge (Boone County, Indiana)
Built ca. 1892; restored 2008-09
Pratt through truss over Big Eagle Creek on Holliday Drive off of US 421, north of Zionsville
Heavily damaged in farm equipment accident

Oak Creek Bridge (Noble County, Oklahoma)
Built ca. 1910
Pony truss bridge over Oak Creek on E0500
Open to traffic

Oak Creek Bridge (Adams County, Illinois)
Pony truss bridge over Oak Creek on TR 77, 2 mi. northwest of Marcelline
open to all traffic

Oak Creek Trail - Oak Creek Bridge (Saunders County, Nebraska)
Built 1908, Abandoned 1993. Converted 1996.
Pratt through truss bridge over Oak Creek on Oak Creek Trail
Open to pedestrians

Oak Dale Road Bridge (Moniteau County, Missouri)
Built ca. 1930
Through truss bridge over Straight Fork on Oak Dale Road northwest of Latham
Open to one-lane traffic with a 15 ton weight limit

Oak Grove Road Bridge (Clarke County, Mississippi)
Bypassed in 1986
Abandoned through truss bridge over Okatibbee Creek on CR 379 (Oak Grove Road)
Abandoned

Oak Hill Cemetery Bridge (Christian County, Illinois)
Built ca. 1910 by the Vincennes Bridge Company, replaced in 1987
Lost Through truss bridge over South Fork Sangamon River on Cemetary Road
Replaced by a new bridge

Oak Ridge Bridge (Nelson County, Virginia)
Built 1882
Pratt through truss bridge over Norfolk Southern Railway on Wilson Road (Route 653)
Open to traffic

Oak Street Bridge (Clayton County, Iowa)
Built 1915
Pony truss bridge over Nagle Creek on Oak Street in Volga
Open to traffic

Oak Street Bridge (Hardin County, Iowa)
Built 1898, Replaced 1928
Lost Pratt through truss bridge over Iowa River on Oak Street
Replaced by a new bridge

Oakland Mills Bridge (Henry County, Iowa)
(Main design: Pratt through truss)
Built in 1876; converted to pedestrian bridge in the 1970s and became part of the state park
Pratt through truss bridge over Skunk River on Pedestrian trail (formerly county road) at Oakland Mills State Park
Open to pedestrians

Oakman Parrish Road Bridge (Walker County, Alabama)
Built 1920
Pratt through truss bridge over Lost Creek on Oakman Parrish Road
Closed to all traffic

Oaks Creek Bridge (Otsego County, New York)
Built ca.1880 by the Wrought Iron Bridge Company
Through truss bridge over Oaks Creek on Lower Toddsville Road
Closed to all traffic

Oatsville Road Bridge (Gibson County, Indiana)
Built 1925; replaced 1999
Lost through truss bridge over New Patoka River on Oatsville Road
Replaced by new bridge

Obed Bridge (Navajo County, Arizona)
Built 1912; rehabilitated 1978, replaced 2010
Lost Pratt pony truss bridge over Little Colorado River on Obed Road
Replaced by new bridge

Obion Creek KY 58 Bridge (Hickman County, Kentucky)
Built 1928
Pony truss bridge over Obion Creek on KY 58
Open to traffic

Obion River Bridge (Obion County, Tennessee)
Built 1928 and operated as toll bridge until 1939
Through truss bridge over Obion River on old TN 211 at Obion
Closed to all traffic about 1990

Obion River Bridge (Dyer County, Tennessee)
Built 1948; rehabilitated 1993
Through truss bridge over Obion River on TN 104
Open to traffic

OC&E State Trail - USRS "A" Canal Bridge (Klamath County, Oregon)
Built 1898, 1917 Relocated to Klamath Falls
Pratt through truss bridge over USRS "A" Canal on Oregon, California & Eastern Railroad Trail
Open to pedestrians

Ocheydan River Bridge (Clay County, Iowa)
(Main design: Warren pony truss with alternating verticals)
Built ca. 1900; Replaced 2015
Warren pony truss bridge over Ocheyedan River on 300th Street
Center pier between pony's - Cap rotted out - Closed after last inspection

Ocmulgee River Bridge (Pulaski County, Georgia)
Built in 1921
Lost Pratt through truss bridge over Ocmulgee River on Route 341 Golden Isle Parkway
No longer exists

Oconee River Bridge (Laurens County, Georgia)
(Main design: Pratt through truss)
Built 1923; Replaced 1952
Lost Pratt through truss swing bridge over Oconee River on Jackson Street
No longer exists

Oelke Road Bridge (Monroe County, Michigan)
Built 1899
Pony truss bridge over North Macon Creek on Oelke Road
Closed to all traffic

Offield Creek CR 325W Bridge (Montgomery County, Indiana)
Built 1915; replaced 1991
Lost through truss bridge over Offield Creek on County Road 325 West
Replaced by new bridge

Offield Creek CR 400W Bridge (Montgomery County, Indiana)
Built 1914; replaced 1999
Lost through truss bridge over Offield Creek on County Road 400 West
Replaced by new bridge

Ogden Street Bridge (Older) (Marinette County, Wisconsin)
Lost Pratt through truss bridge over Menominee River on Ogden Street /1 Street
Replaced by a new bridge

Ogeese Creek Bridge (Neosho County, Kansas)
Built 1905 by A.M. Blodgett, Kansas City, MO.
Lost pony truss bridge over a branch of Neosho River, 0.5 mi. west and 3.9 mi. south of Erie
Destroyed by severe storm.

Ogle Creek Bridge (Alleghany County, Virginia)
Built 1932
Through truss bridge over Ogle Creek on Route 660
Abandoned with deck missing

OHCR - Muskingum River Bridge (Conesville) (Coshocton County, Ohio)
Through truss bridge over Muskingum River on Norfolk & Western RR in Conesville
Open to traffic

Ohio Edison Bridge (Marshall County, West Virginia)
Pratt through truss bridge over Ohio River on Pedestrian Path


Ohio River Back Channel Bridge (Pleasants County, West Virginia)
Built 1928
Through truss bridge over Ohio River Back Channel on CR 2/10 in St. Marys
Open to traffic