Acrow Pony Truss

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Acrow Ltd. was granted a patent in 1973, with their system based on the Bailey design. Since that time, the system has been updated and patented in 1990 to be a stronger, longer and more adaptable design. The current "3rd generation" bridge design is lighter than the original design with a truss that is 50% deeper, 50% stronger in bending and 20% stronger in shear. These improvements are achieved through an improved shape and design of the panel configuration. The triangular panels deviate from the original lattice design in that the panels can be situated and pinned to eliminate the stresses associated with pinhole sag and elastic deflection. For longer spans, the panels can also be staked vertically and connected to create a two-tier system with enhanced stiffness.


Acrow Bridge (Essex County, Massachusetts)
Acrow Pony Truss bridge over Saugus River on General Edward
Open to traffic

Bridge of Lions (Temporary) (St. Johns County, Florida)
Removed Acrow Pony Truss vertical lift bridge over Matanzas River on Anastasia Boulevard at St. Augustine
Open to traffic

Division Street Bridge (new) (Cook County, Illinois)
Ordered from a catalog and assembled; opened September 30, 2014.
Bailey pony truss bridge over Chicago River North Branch Canal on West Division Street
Open to traffic

Fore River Bridge (Temporary) (Norfolk County, Massachusetts)
Acrow Pony Truss bridge over Fore River on 3A Bridge Street
Open to traffic but soon replaced with a new bridge

Lagoon Pond Drawbridge (Temporary) (Dukes County, Massachusetts)
Built 2010; Removed 2015
Lost Bailey pony truss bridge over Lagoon Pond on Beach Road
Replaced by a new bridge

US4 Connecticut River Bridge (Temporary) (Grafton County, New Hampshire)
Bailey/Acrow pony truss bridge over Connecticut River Bridge on US-4
Removed but not replaced