Fishbelly Deck Truss

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Fishbelly deck truss bridges are an exceedingly rare form of deck truss with a distinctive polygonal bottom chord that is parallel to the top chord on all panels except for the last couple panels, where it slopes upward to meet the endpost. The design was usually employed where a substructure was being reused to build a new bridge, but the new bridge needed deeper trusses so it would be stronger. making the truss deeper in the center, but shallower at the ends allowed the substructure to be reused, while also offering the strength of a deeper truss.

Avoca Trail - Mill Creek Bridge (St. Clair County, Michigan)
Fishbelly Pratt deck truss bridge over Mill Creek on Wadhams to Avoca Trail (formerly Pere Marquette RR)
Open to pedestrians only

BO - Black River Bridge (Lorain County, Ohio)
Lost Deck truss bridge over Black River on Baltimore & Ohio Railroad
Replaced by a new bridge

Buzzi Unicem - LaSalle Rail Bridge (LaSalle County, Illinois)
Built 1896, two deck truss spans removed and replaced with a Parker truss in 1932
Through truss bridge over Illinois River/I&M Canal/Railroad (IAIS) on Buzzi Unicem's private rail line in La Salle
Open

CNTP - New River Viaduct (3rd) (Scott County, Tennessee)
Built 1908; Replaced by a new bridge and mostly removed 1963
Abandoned Pratt deck truss bridge over New River once carried Cincinnati, New Orleans and Texas Pacific Railway's Cincinnati Southern Railroad (later Norfolk Southern), before being bypassed
Abandoned

H&BTM - Cypher Bridge (Bedford County, Pennsylvania)
Built 1937
Abandoned fishbelly Warren deck truss bridge over Raystown Branch Juniata River on former H&BT
Derelict/abandoned

MEC - Kennebec River Bridge (Somerset County, Maine)
Built ca.1880 to replace a deck truss covered bridge; destroyed/damaged by flood 1901; converted to pedestrian bridge 1950; destroyed 1987 by flood and replaced with modern pedestrian bridge
Lost Warren deck truss bridge over Kennebec River on Maine Central RR
Replaced by a new pedestrian bridge

MON - Tippecanoe River Bridge (White County, Indiana)
Built ca. 1895, demolished ca. 1990's
Lost Deck truss bridge over Tippecanoe River and access roads on former Monon Railroad in Monticello
Lost

Morenci Southern - Gila River Bridge (Greenlee County, Arizona)
Built 1902;
Abandoned Fishbelly Pratt deck truss bridge over Gila River on Morenci Southern Railroad
Abandoned

North Coast Inland Trail - Sandusky River Bridge (Sandusky County, Ohio)
Built 1899
Warren deck truss bridge over Sandusky River on LS&MS RR
Now part of North Coast Inland Trail

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

PGR - Soquel Creek Bridge (Santa Cruz County, California)
Pratt Deck truss bridge over Soquel Creek on Progressive Rail Inc. tracks
Open Railroad only