Portable Bridge Systems
Our portable bridge is the culmination of a project begun in 1989 in a co-op effort
between USDA Forest Service, WV Division of Forestry and West Virginia
University. The intent of this co-op was seeking a method of crossing small
streams that would be ecologically sound, economical, reusable, maintenance
free and capable of handling extremely heavy loads. Our portable bridge design is the
final result of several different designs and ideas.
Our professionally engineered, pre-stressed portable
bridge is certified to
carry a maximum load of 80,000 #. It is designed to AASHTO Specification HS
(American Association of State Highway Transportation Officials)
The portable bridge is constructed of CCA Treated 2x10’s and 2x12’s that are
pre-stressed and encased in steel channel. The patented shear key design
allows the bridge to operate as a single, solid structure with
being distributed evenly across the entire bridge. It is designed for fast,
easy installation with a dozer and/or boom truck.* For
public use the
alternative CA treatment will be used.
Our Bridge system meets the
requirements of Virginia DEQ Specification 3.24 and we are currently working
with several agencies in Virginia and West Virginia to utilize our bridge
system for flood relief, temporary crossing into wetlands to perfom studies
and for initial access to perform studies of areas being considered for
Our portable bridge will assist drillers and loggers in meeting their BMP’s for stream crossings
by minimizing stream siltation, keeping debris out of the waterway and
minimizing erosion after the operation is complete.
Inexpensive to install
Attractive to land owners
Can be used to overlay
existing weight restricted bridges on small roads.
Minimizes stream siltation
No in-stream construction
Exceeds existing BMP
guidelines for stream crossings
Other uses for the bridge system are large
farms, housing developments and personal home sites.
Patented Shear Key Design
(US Patent No. 5.603.134)
Portable and Reusable
30- and 40- foot bridges
designed for 20- and 30- foot maximum spans.
Two 6-ft panels make a
12-ft wide bridge
Engineered to carry loads up to 80,000 lbs.
Designed to AASHTO
Can be installed with
conventional logging or construction equipment
No permanent abutments
required for temporary installations
Can be skidded to
Engineered Portable Timber Bridges: Owner's Manual
read a report by the US Forest Service regarding temporary portable bridges,
Click here to watch a drilling rig cross one of
our bridges (WMV File - 950KB)
here to visit West Virginia University's Division of Forestry
Bridge under construction
Bridge under construction
Ellison and Haney Manufacturing Inc.
P.O. Box 3810 Charleston, WV 25338
phone: (304)344-9875 fax: (304)344-0852