This locally administered federal aid project involved the rehabilitation of a
historic truss bridge built in 1897. The bridge was a 207-foot, single-span
wrought iron through truss bridge carrying Wood Road over the Cohocton River.
Erdman Anthony provided in-depth bridge inspection, material testing and
sampling, load rating, survey and mapping, hydraulic analysis, environmental
screening, preliminary and final bridge design, construction support, and
construction inspection services. Fisher Associates provided design services for
geotechnical design and maintenance and protection of traffic.
Coordination with the State Historic Preservation Office was required as
the bridge was eligible for listing on the National Register of Historic Places.
The bridge was significant as an intact, representative example of a
pin-connected, wrought iron, Baltimore truss bridge. The Baltimore truss design
is a late nineteenth century adaptation of the Pratt truss design that
incorporates sub-struts to form middle panel points for longer spans. The bridge
also contained Phoenix tube compression members (patented in 1862) that were a
significant technological advance in truss bridge construction.
rehabilitation included the replacement of the timber deck, stringers, and
floorbeams. Several pin-connected eye-bar tension members were replaced and
several built-up members were strengthened. In addition, the stone abutments
were re-pointed, the bridge seats were reconstructed, and the bearings were
rehabilitated. A car-top boat launch with parking area was also constructed at
the site as part of the project.
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