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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.


Manton Road Bridge (Tehama County, California)
Built 1935
Pratt Pony truss bridge over Digger Creek on Manton Road in Manton
Open to traffic

Maple Highlands Trail Covered Bridge 35-28-04 (Geauga County, Ohio)
Built 2013
Pratt through truss bridge over East Branch of Cuyahoga River on Maple Highlands Rail-Trail


Maple Mill Bridge (Washington County, Iowa)
Built 1896
Lost through truss bridge over English River on Fir Avenue
Destroyed by flooding as of 3/10/2016

Maple River Bridge (Woodbury County, Iowa)
Lost Pratt through truss bridge over Maple River on Road
Replaced by a new bridge

Maple Road Bridge (Minnehaha County, South Dakota)
Through truss bridge over Big Sioux River on former Maple Road in Sioux Falls
Open to pedestrians only

Maple Street Bridge (Hampden County, Massachusetts)
Built c. 1900; rehabilitated 2010
Pratt through truss bridge over Westfield River on Maple Street
Open to traffic

Maple Street Bridge (Older) (Manistee County, Michigan)
Built 1873, replaced 1908
Lost Pratt through truss bridge over Manistee River on Maple Street
Replaced by a new bridge

Maquoketa River Bridge (Delaware County, Iowa)
(Main design: Pratt through truss)
Lost Pratt through truss bridge over Maquoketa River on Marion Street
Replaced by a new bridge

Maquoketa River Bridge (Dubuque County, Iowa)
Built 1904
Through truss bridge over Maquoketa River on Bockenstedt Road
Open to traffic

Marantette Bridge (St. Joseph County, Michigan)
Built in the late 1800s
Pratt through truss bridge over St. Joseph River on S. Railroad Street
Closed to all traffic

Marble Branch Bridge (Switzerland County, Indiana)
Built in 1897 by the Brackett Bridge Company; replaced 1999
Lost pony truss bridge over Marble Branch of Grants Creek on Grants Creek Road
Replaced by new bridge

Marco Bridge (Greene County, Indiana)
Built ca. 1930; rehabilitated 1973; replaced 1994
Lost through truss bridge over Black Creek on IN 67
Replaced by new bridge

Margerum Road Bridge (Colbert County, Alabama)
Abandoned pratt through truss bridge over Buzzard Roost Creek on Margerum Rd
Abandoned

Margiotti Bridge (Jefferson County, Pennsylvania)
Built 1937; rehabilitated 1977/1984
Deck truss bridge over Mahoning Creek on PA 436 in Punxsutawney
Open to traffic

Marietta Pike Overpass (Lancaster County, Pennsylvania)
Built 1896; rehabilitated 1960
Pony truss bridge over Amtrak on PA 772 in Mount Joy
Open to traffic

Mariposa Bridge (Lincoln County, North Carolina)
Built 1912 by the Owego Bridge Co.; bypassed 1984
Through truss bridge over Leepers Creek on NC 1412
Bypassed by new bridge and preserved in place

Mark Road Bridge (Fayette County, Ohio)
Built 1883 by the Wrought Iron Bridge Co.; reconstructed 2007
Through truss bridge over Sugar Creek on Mark Road
Open to traffic

Market Street Bridge (Clearfield County, Pennsylvania)
Built 1938; rehabilitated 1994
Through truss bridge over West Branch Susquehanna River on PA 1004 in Clearfield
Open to traffic

Market Street Bridge (Wapello County, Iowa)
Built 1892; Replaced 1971
Lost Pratt through truss bridge over Des Moines River on Market Street
Replaced by a new bridge

Market Street Bridge (5th) (Lycoming County, Pennsylvania)
Built 1894; Demolished 1949
Lost Pratt through truss bridge over West Branch Susquehanna River on Market Street & Interurban
Replaced by a new bridge

Market Street Walkway Bridge (Roanoke, Virginia)
Pratt through truss Bridge over NSRR on pedestrian path
Open to pedestrians only

Marlowe Creek Bridge (Worth County, Missouri)
Built 1885, Relocated Here in 1898; converted to vehicular use ca. 1981; rehabilitated 1996
Pratt Through truss bridge over Marlowe Creek on CR 287
Open to traffic single lane only

Marquand Bridge (Madison County, Missouri)
Old bridge built 1924 at a cost of about $4,000, raised by the community. Replaced 1993.
Lost through truss bridge over Castor River on Route A at Marquand
Replaced by concrete span; portion of old bridge now rests in Marquand City Park

Marseilles Iron Bridge (LaSalle County, Illinois)
Built 1885; Replaced 1933
Lost Pratt through truss bridge over Illinois River
Replaced by a new bridge

Marsh Creek Bridge (Centre County, Pennsylvania)
Built ca. 1900
Pony truss bridge over Marsh Creek on TR 471 in Blanchard
Closed to all traffic

Marsh Road Bridge (Crawford County, Pennsylvania)
Built 1890 by Penn Bridge Co.
Pony truss bridge over Conneaut Outlet on TR 574
Open to traffic

Martin Bridge (Lake County, Colorado)
Pony truss on a bike trail east of Leadville crossing CR 3
Open to two-lane bike traffic above and road traffic below

Martin Road Bridge (Shiawassee County, Michigan)
Built 1885 by the Mt. Vernon Bridge Co.
Through truss bridge over Shiawassee River on Martin Road
Closed to all traffic

Martin Road Bridge (Hendricks County, Indiana)
Built in 1895 by the Pittsburgh Bridge Company; replaced in 1988
Lost Pratt through truss bridge over West Fork White Lick Creek on Martin Road
Replaced by new bridge

Martin Vill Road Bridge (Henry County, Missouri)
Built 1927; rehabilitated 1965
Pony truss bridge over South Grand River on Martin Vill Road
Closed to all traffic

Martindale Bridge (Greene County, Indiana)
Built 1905
Pony truss bridge over Four Mile Creek on CR 600 West
Open to traffic

Martindale Creek CR 950S Bridge (Randolph County, Indiana)
Built ca. 1895
Lost Half-hip Pratt pony truss bridge over Martindale Creek on County Road 950 South
Replaced by a new bridge

Martinton Ditch Bridge (Iroquois County, Illinois)
Built 1955
Pony truss bridge over Martinton Ditch No. 3 on TR 320
Open to traffic

Maryland Street Bridge (Pike County, Missouri)
Built ca. 1920
Pony truss bridge over Town Branch on Maryland Street in Louisiana
Open to one-lane traffic with an 8 ton weight limit

Masemore Road Bridge (Baltimore County, Maryland)
Built 1898; rehabilitated 2000
Through truss bridge over Gunpowder Falls on Masemore Road
Open to traffic

Mason Road Bridge (Gratiot County, Michigan)
Built 1904; Relocated and replaced 1995
Pratt pony truss bridge relocated from Bad River on Mason Road in Ithaca
Relocated and replaced by new bridge

Masonic Park Bridge (Rio Grande County, Colorado)
Built 1909 by the Pueblo Bridge Co.; relocated 1933; replaced 1994
Lost through truss bridge over the Rio Grande on Masonic Park Drive
Replaced by new bridge

Massengill Bridge (Anderson County, Tennessee)
(Main design: Parker through truss)
Built 1916
Lost Parker through truss bridge over Clinch River on Coal Creek Road (Lovely Bluff Road)
Replaced by new bridge

Massey Creek 231st Street Bridge (Cass County, Missouri)
Built ca. 1910
Pony truss bridge over a branch of Massey Creek on 231st Street
Replaced by a new bridge

Masterson Bridge (Marion County, Missouri)
Built 1898 by the Kansas City Bridge Co.
Through truss bridge over North River on CR 189
Replaced by a new bridge

Masterson Bridge (Shelby County, Missouri)
Originally built in 1898, this bridge was relocated here in September of 2013
Pratt through truss bridge on Steam Engine Tracks
Open to traffic

Maumee Road Bridge (Jackson County, Indiana)
Built ca. 1920; Replaced
Pony truss bridge over Combs Branch on Maumee Road
Replaced by a new bridge

Maumelle River AR 300 Bridge (Pulaski County, Arkansas)
Made obsolete by a new bridge in 1981
Through truss bridge over Maumelle River on AR 300
Open to pedestrians only

Mauricetown Bridge (Cumberland County, New Jersey)
Built 1888
Pratt through truss bridge over Maurice River on Highland Street
Partial remains of bridge open to pedestrians only

MAW - Maumee River Bridge (Defiance County, Ohio)
Built 1893
Pratt through truss bridge over Maumee River on Maumee and Western Railroad
Open to rail traffic

Max Bridge (Furnas County, Nebraska)
Pratt pony truss bridge over Medicine Creek on a pedestrian trail
Open to pedestrians only

Maxwell Bridge (Montgomery County, Indiana)
Built 1913; replaced 2000
Lost through truss bridge over Sugar Creek on CR 425 E
Replaced by new bridge

Maybert Road Bridge (Nevada County, California)
Built 1915; replaced 2017
Pratt Pony truss bridge over Canyon Creek on Maybert Road
Replaced by a new bridge

Maywood Bridge (Lewis County, Missouri)
Built 1894 by the St. Louis Bridge & Iron Co.; replaced 1999
Lost through truss bridge over Middle Fabius River on CR 587
Replaced by new bridge

McCaffrey Bridge (Winneshiek County, Iowa)
Built 1924
Two-span through truss bridge over Upper Iowa River on 244th Avenue, east of Bluffton
Open to one-lane traffic

McCain Bridge (Pulaski County, Missouri)
Lost three-span through truss bridge somewhere near Richland, probably over Gasconade River
Replaced by new bridge

McCall Bridge (Stone County, Missouri)
Built 1915 by contractor Fred L. Appleby; replaced 2002
Lost through truss bridge over James River on CR V-70
Replaced by new bridge and torn down

McCann Road Bridge (Barry County, Michigan)
Built 1892; New Deck 1950's; Replaced 1987
Lost Pratt pony truss bridge over Thornapple River on Mc Cann Road in Hastings
Replaced by new bridge

McCarty Creek CR 657 Bridge (Vernon County, Missouri)
Built ca. 1895 by the Missouri Valley Bridge & Iron Works
Pony truss bridge over McCarty Creek on CR 657 (Tyree Road)
Open to traffic

McCarty Creek Road Bridge (Tehama County, California)
Built 1937
Pin-connected Pratt Through truss bridge over McCarty Creek on McCarty Creek Road
Open to traffic

McCauley Road Bridge (Cecil County, Maryland)
Built 1884; rehabilitated 1993
Pony truss bridge over Basin Run on McCauley Road
Open to traffic

McClamrock Ditch CR 750E Bridge (Clinton County, Indiana)
Built ca. 1898 by the Lafayette Bridge Company
Lost Bedstead Pratt pony truss bridge over McClamrock Ditch on County Road 750 East
Replaced by a new bridge

McClintock Bridge (Venango County, Pennsylvania)
Built 1930; rehabilitated 1978
Through truss bridge over Oil Creek on PA 8 in Hasson Heights
Replaced by a new bridge

McClure Bridge (Whitman County, Washington)
Built 1908, replaced 1989
Lost Pratt through truss bridge over Palouse River
Replaced by new bridge

McClure Road Bridge (Darke County, Ohio)
Built 1882 by the Massillon Bridge Co.
Through truss bridge over Greenville Creek on McClure Road (TR 276)
Closed to all traffic

McClure Road Bridge (Putnam County, Indiana)
Built 1915; replaced 1997
Lost through truss bridge over Mill Creek on CR 1025 E
Replaced by new bridge

McCoy Bridge (Macon County, North Carolina)
Built ca. 1915, truss span possibly relocated here in the 1940s and rehabilitated in 1960.
Through truss bridge over Little Tennessee River on NC 1456
Open to traffic

McCoy Road Bridge (Putnam County, Indiana)
Built in 1923 by the Vincennes Bridge Co.
Through truss bridge over Clear Creek on CR 375 East
Open to traffic

McCraney Creek Bridge (Adams County, Illinois)
Built 1916
Through truss bridge over McCraney Creek on TR 350A
Open to traffic

McCutcheon Road Bridge (Jefferson County, Pennsylvania)
Built 1905; rehabilitated 1995; replaced 2009
Lost pony truss bridge over Mill Creek on McCutcheon Road
Replaced by a new bridge

McDonough Street Bridge (Old) (Will County, Illinois)
Built 1911;
Lost Pratt through truss bridge over Des Plaines River on McDonough Street & CO&P Railroad
Replaced by a new bridge

McFadden Creek, Branch-Breeze Rd. Bridge (Posey County, Indiana)
Built 1905; replaced 1993
Lost pony truss bridge over a branch of McFadden Creek on Breeze Road
Replaced by a new bridge

McFadden Creek-Bluff Rd. Bridge (Posey County, Indiana)
(Main design: Pratt through truss)
Built 1895; removed 1997
Lost through truss bridge over McFadden Creek on Bluff Road
Only the substructure remains

McFadden Creek-Leonard Rd. Bridge (Posey County, Indiana)
Built 1899
Bedstead Pratt pony truss bridge over McFadden Creek on Leonard Road
Replaced by a new bridge

McKee Creek Bridge (Adams County, Illinois)
Built 1933
Pony truss bridge over McKee Creek on TR 367
Open to traffic

McKeown Bridge (Old) (Muscatine County, Iowa)
Built 1879; Replaced 1951
Lost Pratt through truss bridge over Cedar River on Lord's Ferry Road
Replaced by a new bridge

McKillip Ditch Bridge (White County, Indiana)
Unknown, but likely built on a county road and later acquired for private use.
Abandoned pratt pony truss bridge over McKillip Ditch on Field crossing
Abandoned with mostly intact but dilapidated deck

McKinney Creek Bridge (Polk County, Arkansas)
Built 1915
Pony truss bridge over McKinney Creek on CR 50
Closed to all traffic

McLean Branch MO 79 Bridge (Lincoln County, Missouri)
Built 1938
Through truss bridge over McLean Branch on MO 79 at Winfield
Open to traffic

Mclean Station Road Bridge in Marlborough Township, PA (Montgomery County, Pennsylvania)
Built ca. 1890; rehabilitated 1961
Pony truss bridge over Macoby Creek on Mclean Station Road in MarlboroughTownhip, Pennsylvania
Open only to golf carts and pedestrians

McPherson's Ford Bridge (Alleghany County, Virginia)
Built 1896; Rehabilitated in 1948, bypassed and preserved 2013
Through truss bridge over Cowpasture River on Route 633 (McKinney Hollow Rd)
Open to pedestrians only

McPhillips Road Bridge (Harrison County, Indiana)
Built ca. 1900
Lost Pratt pony truss bridge over Middle Fork of Buck Creek on McPhillips Road
Replaced by a new bridge

ME/Amtrak Overpass (Union County, New Jersey)
Through truss bridge over Amtrak on Morristown & Erie Railway
Open to traffic

Mead Road Bridge (Clinton County, Michigan)
Built 1907
Through truss bridge over Maple River on Mead Road
Closed to all traffic

Meadow Lane Bridge (Hunterdon County, New Jersey)
Built 1900; rehabilitated 1991
Pony truss bridge over North Branch Rockaway Creek on Meadow Lane
Open to traffic

Meadow Road Bridge (Dodge County, Wisconsin)
Built 1890; Replaced 1995
Lost Pratt through truss bridge over Beaver Dam River on Meadow Road in Town of Lowell
Replaced by new bridge

Meadow Road Bridge (Coos County, New Hampshire)
(Main design: Pratt through truss)
Built 1897 by the Groton Bridge Co..; Bypassed in 1984; Two center spans removed from river and placed on banks in 2004
Pin connected Pratt through truss bridge over Androscoggin River in Shelburne
Closed to all traffic

Meadow Run Road Bridge (Fayette County, Pennsylvania)
Built 1904 by York Bridge Co.
Pony truss bridge over Meadow Run on Meadow Run Road
Open to traffic

Meadowlake Park Bridge (Garfield County, Oklahoma)
Pony truss bridge over Boggy Creek on miniature railroad in Enid
Open to traffic

Meadowland Street Bridge (Minnehaha County, South Dakota)
Pratt through truss bridge over Big Sioux River on Meadowland Street (now private), 5 miles south of Baltic
Closed to all traffic

Meadowview Drive Bridge (York County, Pennsylvania)
Built 1890. Possibly Rehabilitated/Moved 1930.
Pratt pony truss bridge over North Branch Bermudian Creek on PA 4038 (Meadowview Drive)
Open to traffic

Measel Road Bridge (Morgan County, Indiana)
Built 1925
Pony truss bridge over Lake Ditch on Measel Road
Open to traffic

Meatpacking Bridge (Denver County, Colorado)
Abandoned pratt pony truss bridge over South Platte River, Spur railroad on Industrial meat packing chute
Abandoned

MEC - Carrabassett River Bridge (Somerset County, Maine)
Abandoned pratt through truss bridge over Carrabassett River on Maine Central Railroad
Abandoned

MEC - Kennebec River Bridge (Augusta) (Kennebec County, Maine)
(Main design: Whipple through truss)
Lost Bridge over Kennebec River on Railroad
Removed but not replaced; Supports still stand

MEC - Kennebec River Bridge (Old) (Kennebec County, Maine)
Lost Pratt through truss bridge over Kennebec River on Maine Central Railway
Replaced by a new bridge

Medicine Bow River Bridge (Carbon County, Wyoming)
Built 1914; rehabilitated 1972
Through truss bridge over Medicine Bow River on CN6-121
Open to traffic

Medicine Bow River Bridge (Carbon County, Wyoming)
Built 1915
Through truss bridge over Medicine Bow River on CN6-3
Open to traffic

Medicine Creek Bridge (Frontier County, Nebraska)
Built 1935
Pony truss bridge over Medicine Creek on CR-735, 2.7 mi. south and 3.5 mi. east of Stockville
Open to traffic

Medicine Lodge River Bridge (Barber County, Kansas)
Built ca. 1910
Lost through truss bridge over Medicine Lodge River, 2.0 mi. north and 5.9 mi. west of Medicine Lodge
Removed but not replaced

Medicine River Bridge (Barber County, Kansas)
Built ca. 1910
Pratt through truss bridge over Medicine River, 2.0 mi. west of Medicine Lodge
Replaced by a new bridge

Medio Creek Bridge (Bee County, Texas)
Built 1897; Rehabbed 1923 and 1947; Closed 1987
Through truss bridge over Medio Creek on CR 241
Closed to traffic

Mehaffey Bridge (Older) (Johnson County, Iowa)
Built 1896; Removed 1959
Lost Pratt through truss bridge over Iowa River on Johnson County Road Y
Replaced by a new bridge

Meiser/Globe Mills Bridge (Snyder County, Pennsylvania)
Built 1941; rehabilitated 1995 and 2011
Through truss bridge over Middle Creek on PA 1007
Open to traffic

Melvin Price Trail Wood River Creek Bridge (Madison County, Illinois)
6 span Pratt Pony Truss Bridge over Wood River Creek built 2001
Pratt pony truss bridge over Wood River Creek on MCT Melvin Price Trail
Open to pedestrians