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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.


Old County Road 127 Through Truss (Olmsted County, Minnesota)

Private Road

Old County Road Bridge (Richardson County, Nebraska)
Pratt through truss bridge over Winnebago Creek on 709 Road
Open to traffic but barely used

Old Covington Bridge (Washington County, Illinois)
(Main design: Pratt through truss)
Lost through truss bridge with wooden deck, replaced by a modern bridge in the 1980s.
Lost pratt through truss bridge over Kaskaskia River on Covington Road
Replaced by new beam bridge at current site

Old CR 146 Pony Truss (Comanche County, Texas)
Pratt pony truss bridge over unnamed creek on road
Open to traffic

Old CR 193 Pony Truss (Comanche County, Texas)
Abandoned pony truss bridge over unnamed creek on road
Derelict/abandoned

Old CR 198 Bridge (Coryell County, Texas)
Abandoned through truss bridge over Leon River on old road alignment
Derelict/abandoned

Old CR 400 N Bridge (Hancock County, Indiana)
Removed from county bridge inventory sometime prior to 1979.
Pratt pony truss bridge over Buck Creek on a closed off section of CR 400 N
May be used occasionally by Mt. Comfort Airport personnel

Old CR408 Pony Truss (Eastland County, Texas)
Abandoned pratt pony truss bridge over unnamed creek on road
Derelict/abandoned

Old Cross Street Pony Truss (Cooke County, Texas)
Pony truss bridge over Unnamed creek on Trail
Open to pedestrians only

Old Danforth Street Bridge (Middlesex County, Massachusetts)
Built 1890 by Dean & Westbrook; bypassed 1982
Pratt pony truss bridge on an old alignment of Danforth Street over Sudbury River
Open to pedestrians

Old Deschutes Road Bridge (Shasta County, California)
Pier encased in concrete 1925; Converted to road use 1944 ; Replaced 1970
Lost Pratt through truss bridge over Sacramento River on Deschutes Road
Replaced by a new bridge

Old Dobbs Ford Bridge (Bradley County, Tennessee)
Built 1878, moved to the present site in 1990
Pratt pony truss bridge over Candies Creek on golf cart track
Closed to all traffic

Old Dogtown Road Bridge (Marshall County, Kentucky)
Built 1919
Pratt through truss bridge over East Fork of Clarks River on Old Dogtown Road
Intact but closed to all traffic

Old Duncan Grade Road Bridge (Sonoma County, California)
Built 1924
Pratt through truss bridge over Austin Creek on Old Duncans Grd Road
Intact but closed to all traffic

Old East Street Bridge (Champaign County, Illinois)
Built 1912
Through truss bridge over Sangamon River on a pedestrian trail (former East Street) in Mahomet
Open to pedestrians

Old East Walnut Street Bridge (Boone County, Missouri)
Pratt pony truss bridge over Hinkson Creek on Old East Walnut Street
Closed to all traffic

Old Federal Road Bridge (Murray County, Georgia)
Built 1918
Pony truss bridge over Mill Creek on Old Federal Road in Eton
Open

Old Federal Road Bridge (McMinn County, Tennessee)
Built around 1900
Abandoned Pratt pony truss bridge over Cane Creek on abandoned section of the Old Federal Road (predecessor of US 411)
Abandoned on private property

Old Forge Bridge (York County, Pennsylvania)
Built 1887; rehabilitated ca. 1975
Through truss bridge over Yellow Breeches Creek on TR 968 (Sheepford Road)
Open to traffic

Old Forge Bridge (Essex County, New York)
Built 1901 by Canton Bridge Co; Closed c.1990
Pin connected Pratt pony truss bridge over Boquet River on Old Forge Road
Intact but closed to all traffic

Old Galena Trail Plum River Bridge (Carroll County, Illinois)
Built 1955; rehabilitated 1985
Pony truss bridge over Plum River on North Old Galena Trail
Open to traffic

Old Grade Road Bridge (Adair County, Missouri)
Built 1924; replaced 1989
Lost skewed through truss bridge over North Fork Salt River (Brashear Ditch) on CR 285 (Old Grade Road) south of Brashear
Replaced by a concrete bridge

Old Hackensack Road Bridge (Dutchess County, New York)
Pratt pony truss bridge over Green's Pond Outlet on Old North Hackensack Road Alignment(?)
Abandoned

Old Hadley Ferry Rd Bridge (Grady County, Georgia)
Abandoned pratt pony truss bridge over Ochlocknee River on an abandoned section of Cr 154
Abandoned

Old Hagerstown Road Bridge (Frederick County, Maryland)
Built 1920; rehabilitated 1978; relocated to local golf course 1994
Pratt pony truss bridge originally over Little Catoctin Creek on Old Hagerstown Road
Relocated for reuse

Old Handley Ederville Road Bridge (Tarrant County, Texas)
Abandoned pratt pony truss bridge over an old channel of the West Fork Trinity River on an old alignment of Handley Ederville Road
Abandoned

Old Harmony Church Rd Bridge (Robertson County, Tennessee)
Pratt through truss bridge over Sulphur Fork Creek on Old Harmony Church Rd (old alignment of TN 76)
Intact but closed to all traffic

Old Hedge Lane Bridge (Miami County, Kansas)
(Main design: Parker through truss)
Replaced by new bridge, but never removed. Thus far, no records of this bridge have been located.
Abandoned Parker through truss bridge over Marais des Cygnes River on Abandoned road (formerly Hedge Lane)
Abandoned

Old Henry River Road Bridge (Burke County, North Carolina)
Built 1912
Lost Pratt deck truss bridge over Henry River on Henry River Road (Old Alignment)
Replaced by new bridge

Old Highway 53 Bridge (Oldham County, Kentucky)
Abandoned pony truss bridge over Harrods Creek on Old highway 53
Abandoned

Old Hill Bridge CR 600 S (Clay County, Indiana)
Built in 1899 by the Indiana Bridge Company; replaced 1992
Lost through truss bridge over Eel River on CR 600 S
Replaced by new bridge

Old Hughey Road Bridge (Lincoln County, Tennessee)
Abandoned pony truss bridge on Old Hughey Road
Abandoned

Old IN 18 Pipe Creek Bridge (Grant County, Indiana)
Built ca. 1900; replaced 1998
Lost pony truss bridge over Pipe Creek on Old IN 18
Replaced by new bridge

Old IN 62 Bridge (Clark County, Indiana)
Built 1927
Abandoned pratt pony truss bridge over Fourteen Mile Creek on an old alignment of IN 62 in Charlestown State Park
Abandoned

Old Irish Hollow Road Bridge (Jo Daviess County, Illinois)
Built ca 1922; Bypassed 1983
Pony truss bridge over Irish Hollow Creek on Former Alignment of Irish Hollow Rd
Closed to all traffic

Old Jones Ford Bridge (Union County, South Carolina)
Abandoned pratt through truss bridge over Enoree River on Old State Road 44-22
Abandoned

Old Katy Bridge (Geary County, Kansas)
Built 1895 by the Pencoyd Bridge & Construction Co. Abutments rehabilitated in 1908 and 1913. Opened to vehicular traffic in 1974.
Through truss bridge over Lyon Creek on Otter Creek Road, just southeast of Wreford
Open to traffic

Old Keokuk-Hamilton Bridge (Lee County, Iowa)
Built in 1917, Roadway deck Service Discontinued 1985
Through truss bridge over Mississippi River on Keokuk Junction Railway
Open to rail traffic only. The upper deck on the Iowa side has been converted to an observation deck; the upper deck on the Illinois side is closed to traffic. Roadway traffic has been shifted to the 1985 beam span to the southwest of the bridge

Old KY 1 Bridge (Carter County, Kentucky)
Former KY Rt. 1 bridge, abandoned when U.S. 60 realigned through the area.
Abandoned truss bridge over Little Sandy River on Rt. 1
Derelict/abandoned

Old KY 1657 Bridge (Pendleton County, Kentucky)
Lost 2012
Pratt through truss bridge over south fork grassy creek on old Ky 1657
Collapsed

Old La Grange Road Bridge (Stanislaus County, California)
Through truss bridge over Stanislaus River
Open to pedestrians

Old Lea Bridge (Hamilton County, Tennessee)
Built 1886, moved to present location sometime in the late 1990's
Pratt pony truss bridge over Wolftever Creek on Collegedale Greenway
Open to pedestrians

Old Lincoln Highway Bridge (Douglas County, Nebraska)
Replaced 1998, the Pony Truss structures were replaced on the new bridge
Lost pony truss bridge over W Br Papillion Creek on Old Lincoln Hwy
Replaced by new bridge

Old Little Crooked Creek Bridge (Anderson County, Kentucky)
Pratt through truss bridge over Crooked Creek on an old alignment of Little Crooked Creek Road (now a private driveway)
Open to private traffic only

Old Lombard Street Iron Bridge (Baltimore, Maryland)
Built 1877, disassembled and moved for storage ca. 1975
Abandoned pony truss bridge in storage for potential reuse/preservation
In Storage

Old Main Street (CR 112) Bridge (Jefferson County, Alabama)
Abandoned pratt through truss bridge over Five Mile Creek on an old alignment of CR 112
Abandoned

Old Main Street Bridge (Sagadahoc County, Maine)
Built in 1916 and disassembled and sitting in a parking lot as of 2012
Pratt through truss bridge over Unknown Creek on Old Main Street
In storage or disassembled

Old Main Street Bridge (Wayne County, Indiana)
(Main design: Pratt deck truss)
Built 1897, replaced in 1917
Lost Deck truss bridge over East Fork Whitewater River on Main Street in Richmond
Replaced by a new bridge

Old Mans Creek Bridge (Johnson County, Iowa)
Built ca. 1930
Through truss bridge over Old Mans Creek on CR W62 (Sharon Center Road)
Bridge is being demolished according to forum post

Old Mattole Road Bridge (Humboldt County, California)
Built 1926
Pratt Pony truss bridge over Mcnutt Creek on Old Mattole Road
Open to traffic

Old McKinney Road Bridge (Denton County, Texas)
Abandoned Pratt Through Truss bridge over Elm Branch Trinity River
Abandoned

Old Michigan Street Bridge (Marshall County, Indiana)
Built ca. 1885
Lost Pratt through truss bridge over Yellow River on Michigan Street (Old Michigan Road)
Replaced by a new bridge

Old Milk River Bridge (Blaine County, Montana)
Abandoned timber through truss bridge over Milk River next to 8 Mile Road
Derelict/abandoned

Old Mill Bridge (Jasper County, Illinois)
Built 1890 by the Chicago Bridge Co.
Pratt through truss bridge over Embarras River on TR 164
Bridge is being rehabbed as part of the Eagle Trails

Old Mill Bridge (Elmore County, Alabama)
Built 1920
Through truss bridge over Tallapoosa River on Old Railroad/Private St in Tallassee
Closed to all traffic

Old Mill Rd. White Deer Hole Creek Bridge (Union County, Pennsylvania)
Built 1889; rehabilitated 1994
Through truss bridge over White Deer Hole Creek on Old Mill Rd.
Open to traffic

Old Mill Road Bridge (Frederick County, Maryland)
Built 1882 by the Pittsburgh Bridge Co.
Through truss bridge over Owens Creek on Old Mill Road
Open to traffic

Old Mill Road Bridge (Northampton County, Pennsylvania)
Built 1867; rebuilt in 1930 and 1948
Pratt through truss bridge over Saucon Creek on Old Mill Rd in Lower Saucon Township
Open to pedestrians

Old Mill Road Bridge (Hunterdon County, New Jersey)
Built 1899, altered 1955
Pony truss bridge over Wickecheoke Creek on Old Mill Road
Open to traffic

Old Mine Road Bridge (Sussex County, New Jersey)
Pratt pony truss bridge over Flat Brook on an abandoned alignment of Old Mine Rd
Closed to all traffic

Old Mines Bridge (Washington County, Missouri)
Built 1923; rehabilitated 1933; replaced Summer 2007
Lost pony truss bridge over Old Mines Creek on MO 21
Replaced by a new bridge

Old Monroe Bridge (Lincoln County, Missouri)
Built 1930
Three-span through truss bridge over Cuivre River on Main Street (Old MO 79) in Old Monroe
Closed to all traffic.

Old Montgomery Highway Bridge (Macon County, Alabama)
Abandoned pratt pony truss bridge over Calebee Creek on an abandoned section of US 80 (Old Montgomery Highway)
Derelict/abandoned, but easily accessible to pedestrians

Old Monticello Road Bridge (Bradley County, Arkansas)
Lost swing through truss bridge over Saline River on AR 4 (now US 278) between Warren and Monticello
Replaced 1949 by a new bridge located upstream

Old Mulberry Bridge (Lincoln County, Tennessee)
(Main design: Camelback through truss)
Built 1901 by the American Bridge Company, Abandoned 1970, 1991 Rehabilitated and reopened
Camelback through truss bridge over Elk River on Quarter Road
Open to traffic

Old Muscatine Road Bridge (Cedar County, Iowa)
Built 1935; rehabilitated 1950
Through truss bridge over Sugar Creek on Muscatine Road
Open to traffic

Old Nabb/New Washington Road Bridge (Clark County, Indiana)
bypassed 1981
Abandoned pratt through truss bridge over Fourteen Mile Creek on a former alignment of Nabb/New Washington Road
Abandoned

Old NM 65 Gallinas Creek Bridge (San Miguel County, New Mexico)
Abandoned Pratt through truss bridge over Gallinas Creek on former alignment of highway 65 possibly
Derelict/abandoned

Old Nokomis Road Bridge (Christian County, Illinois)
Built 1914, removed 1973
Lost Pratt through truss bridge over S Fork Sangamon River on S. Shumway St./N 1250 East Rd
No longer exists

Old North Park Steet Bridge (Kent County, Michigan)
Built 1904 as part of a five span bridge (North Park Bridge) over the Grand River, N.P.B. closed and was replaced in 1988, however, one span was saved and relocated to current location
Pratt through truss bridge over a pond on a pedestrian path in Riverside Park
Open to pedestrians

Old Ohio 123 Bridge (Warren County, Ohio)
Built in 1880 by the Kellogg and Maurice Bridge Co.
Pratt through truss bridge over Abandoned Pennsylvania Railroad Grade on Old Ohio 123
Intact but closed to all traffic

Old PA281 Youghiogheny River Bridge (Somerset County, Pennsylvania)
Built 1896, load-bearing girders added 1948, trusses removed from girders 1998
Lost Pratt through truss bridge over Youghiogheny River on PA 281
Removed but not replaced

Old Park Road Kokomo Creek bridge (Howard County, Indiana)
Park Road today has a bridge West of here over Kokomo Creek, but in the early 20th Century it travelled down a different alignment and over this structure. When nearby steel mill expanded, old road was used for back entrance into plant.
Lost Bedstead Pratt pony truss bridge over Kokomo Creek on Former alignment of Park Road and later used as South gate entrance for former Continental Steel plant.
Lost

Old Pearl Street Bridge (McHenry County, Illinois)
Built 1881 over Fox River on Pearl Street in McHenry IL, relocated to Terra Cotta Industries Nov. 1976, two of three original sections in storage
Through truss bridge over a branch of Fox River on Pedestrian path
Open to pedestrians only

Old Pine Street Bridge (Niagara County, New York)
Replaced 1901
Lost Pratt deck truss bridge over Erie Canal on Pine Street
Replaced by a new bridge

Old Pinnacle Road Bridge (Cheatham County, Tennessee)
The Nashville, Chattanooga and St. Louis Railroad installed the two truss spans in 1898 and the Virginia Bridge and Iron Co. fabricated the plate girder in 1911. In 1922 the County acquired the bridge for a roadway.
Through truss bridge over Harpeth River in Kingston Springs
Closed to all traffic

Old Plattsmouth Railroad Bridge (Cass County, Nebraska)
(Main design: Whipple through truss)
Built 1880 under the direction of George S. Morison; replaced 1903
Lost Whipple through truss bridge over Missouri River
Replaced by new bridge

Old Pocahontas Bridge (Randolph County, Arkansas)
Replaced by new through truss bridge in 1934
Lost swing through truss bridge over Black River on Old US 67
No longer exists

Old Rainbow Lake Bridge (Spartanburg County, South Carolina)
Abandoned pratt through truss bridge over Rainbow Lake on Rainbow Lake Road
Abandoned

Old Rankin Bridge (Cocke County, Tennessee)
6 span Pratt through truss design bridge over French Broad River on Rankin Road
Closed to all traffic

Old Revilee Creek Bridge (Logan County, Arkansas)
Pony Truss bridge over Revilee Creek on hwy. 10 replaced by Concrete Tee Beam Bridge in 1930
Lost Pony truss bridge over Reville Creek on State Hwy. 10 East
Replaced by new bridge

Old River Bridge (Saline County, Arkansas)
Built 1899 by the Youngstown Bridge Co. of Youngstown, Ohio; closed to traffic in 1974
Two-span through truss bridge over Saline River on the Old Military Road near Benton
Abandoned with portions of deck missing

Old River Bridge (San Joaquin County, California)
(Main design: Howe through truss)
Built 1915; rehabilitated 1978
Swing bridge over Old River on CA 4 in Discovery Bay
Open to traffic

Old River Road Bridge (Delaware County, Indiana)
Built ca. 1885
Lost Pratt through truss bridge over White River on River Road just North of Daleville
Replaced by a new bridge

Old River Road Through Truss (Bosque County, Texas)
Built 1915;
Pratt through truss bridge over North Bosque River on Old road alignment
Intact but closed to all traffic

Old Rocky Road Bridge (Jo Daviess County, Illinois)
Through truss bridge over East Fork of Galena River on Abandoned Rocky Road
Derelict/abandoned

Old Rodgers Lane Bridge (Lincoln County, Tennessee)
Pratt pony truss bridge over Walker Creek on Old Rodgers Ln
Open to traffic

Old Rogana Road Bridge (Sumner County, Tennessee)
Lost Pratt through truss bridge over Bledsoe Creek on Old Rogana Road
No longer exists

Old Route 11 Marble River Bridge (Clinton County, New York)
Route 11 re-aligned 1936
Half-hip Pratt pony truss bridge over Marble River on Private Driveway (former alignment of U.S. 11)
Open to pedestrians only

Old Route 61 Wolf Creek Bridge (Bland County, Virginia)
Built 1890 as a railroad bridge; Converted to highway bridge in 1946 when rail line discontinued; closed to vehicular traffic in 1987
Pratt through truss bridge over Wolf Creek on former Route 61
Open to pedestrians

Old Rt. 36 Bridge (Sangamon County, Illinois)
Built 1922; bypassed 1958 but remained open until Aug. 1979, removed 1983
Lost Pratt through truss bridge over Sangamon River on Old US 36 at Riverton
Replaced by a new bridge

Old Rt. 68 Licking River Bridge (Nicholas County, Kentucky)
Built 1917
2-span Through truss bridge over Licking River on Old US 68
Closed to vehicular traffic, but passable by pedestrians.

Old Spring River Bridge (Lawrence County, Arkansas)
Replaced 1937
Lost Pratt through truss bridge over Spring River & Railroad on US 62
Replaced by new bridge

Old Startex Bridge (Spartanburg County, South Carolina)
Abandoned when new adjacent bridge built in 1989.
Abandoned truss bridge over Middle Tyger River
Derelict/abandoned

Old State Road Bridge (Clinton County, Illinois)
Built ca. 1930
Pony truss bridge over Beaver Creek on Old State Road (TR 109)
Open to one-lane traffic with a 6 ton weight limit

Old State Road Bridge (Essex County, New York)
Built circa 1890; rehabilitated 1975
Pin connected Pratt pony truss bridge over AuSable River on Old State Road
Closed to all traffic

Old Stewart Creek Bridge (Rutherford County, Tennessee)
Was first iron bridge built in Rutherford County, Orginally crossed Stewarts creek between Murfreesboro and Smyra on the turnpike
Pony truss bridge over lyttle creek on pedestrian trail
Open to pedestrians

Old Stone Fort Bridge (Coffee County, Tennessee)
Built 1906 by the Joliet Bridge Co. at the Dabbs Ford over the Elk River; bridge relocated to present location in 1971, piers rehabilitated 2009
Pratt through truss bridge over Duck River on County Road B-188 (Campground Road) in Manchester
Open to traffic

Old Sublimity Bridge (Laurel County, Kentucky)
Built ca. 1930
Pratt pony truss bridge over Rockcastle River on a pedestrian path
Open to pedestrians

Old Survey Road Through Truss (Cooke County, Texas)
Built 1893; Relocated to Parkhill Park in Callisburg, Texas in 2004
Pratt through truss bridge formerly over Sandy Creek on Survey Road now in park
Replaced by a new bridge and relocated