July/August 2021 - 85

FEATURE ARTICLE
Pile Driving Through Variable
Conditions at Vermont Bridge
Interstate I-91 is one of two main
interstates in Vermont and serves as a
primary north-south corridor from New
Ha v e n , Conn e c t i c u t , t h r o u g h
Massachusetts and Vermont, to the
Canadian border. The I-91 northbound
and southbound bridges in Rockingham,
Vermont, carry the roadway over the
Williams River tributary and Green
Mountain Railroad (GMR).
The original 4-span deck truss
bridges of the Vermont Agency of
Transportation (VTrans) are called the
northbound 24N, and southbound 24S.
Constructed in the early 1960s, they are
known locally as the " high bridges. "
Having served their design life, VTrans
determined it best to replace the bridges.
The bridges are up to 130 ft (40 m)
above the Williams River and GMR
track, with embankments that support
abutments that are over 100 ft (30 m)
high. The northern embankment
placed in the early '60s was constructed
over the original Williams River
View of nearly complete I-91 bridges
I-91 bridges site location plan (credit USGS Bellows Falls, 2021)
channel, requiring the river course to be
shifted approximately 300 ft (91 m) to
the south at the bridges' crossing.
Design-build project delivery was
used to develop replacement bridges
that are 4-span, and 6 ft (2 m) wider than
the originals, and approximately 850 ft
(260 m) in length. The design-build
team for developing the largest spliced
precast concrete girder structure in
Vermont was led by general contractor
Reed & Reed with HDR as the engineer
of record and GEODesign as the
geotechnical engineer.
AUTHORS Dan Howey, P.E., Theodore von Rosenvinge, P.E., D.GE, GEODesign and Tom French, P.E., HDR
DEEP FOUNDATIONS * JULY/AUG 2021 * 85

July/August 2021

Table of Contents for the Digital Edition of July/August 2021

July/August 2021 - Intro
July/August 2021 - 1
July/August 2021 - 2
July/August 2021 - 3
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