PROJECT OVERVIEW

“WE ARE BUILDING THE BRIDGE”

(Building the Bridge, REO Speedwagon | Songwriter: Kevin Cronin)

 

Rockingham Bridge Replacement

REPLACING A CRITICAL VERMONT BRIDGE

We were the geotechnical engineer for the Design-Build team for the Interstate I-91 Rockingham, Vermont Bridges Replacement Project. The project replaced the northbound and southbound bridges over the Williams River and the Green Mountain Railroad. The Vermont Agency of Transportation (VTrans) designated the bridge as a critical bridge. A critical bridge must remain open to all traffic after the design earthquake and must be usable by emergency vehicles and for security/defense purposes after a large earthquake.

Rockingham Bridge Replacement

The replacement bridges are four-span, approximately 850 feet long with spliced concrete beams and concrete bridge decks. The bridge elevation decreases by approximately 40 feet from the south to the north. The bridge is 100 to 150 feet high above the Williams River and GMR track. The replacement bridges and approaches are wider than the previous roadway, requiring widening of the bridge approaches. The north abutments were constructed on existing fill embankments over 100 feet in height and of variable density, over natural alluvial and glacial till deposits.

The Solutions Unearthed

Client: HDR, Inc.

© 2019 GEODesign, Inc.