Sand Hill Bridge

Middlebury, VT

Designers of the new Sand Hill Bridge in Middlebury, Vermont, needed to create an arched design to replicate the look of the original 1924 design to meet the desires of local historical groups and town officials. But the new bridge’s configuration wouldn’t create the proper arch shape. To resolve this challenge, designers used a total-precast concrete design featuring NEXT (New England Extreme Tee) beams that span above a precast concrete arch that supports only its own dead load.

“We had a number of discussions and presentations with the citizens of Middlebury, who really wanted to retain the arched design,” says Greg Goodrich, assistant project manager at VHB Engineering. The challenge was more complex than it appeared. Because the gorge had become weathered and weakened over time, the bridge span was lengthened so it didn’t bear directly on the gorge edges, as the original bridge did. But the gorge wasn’t deep enough to create an arch with the right ratio to avoid appearing elliptical with the lengthened span.

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Projects details

  • PrecasterJ.P. Carrara & Sons, Inc.

  • OwnerVTrans

  • EngineerVHB Engineering

  • ContractorT. Buck Construction

Key Project Attributes

  • (6) P/C footings (heaviest piece weight approximately 82,000 lbs)

  • (5) P/C abutment walls (heaviest piece weight approximately 69,000 lbs)

  • (4) P/C wing walls (heaviest piece weight approximately 79,000 lbs)

  • (12) P/C arch segments (heaviest piece weight approximately 30,000 lbs)

  • (6) P/C approach slabs (heaviest piece weight approximately 38,000 lbs)

  • (4) P/S NEXT D beams (heaviest piece weight approximately 109,000 lbs)

  • (16) P/C Architectural fascia panels (heaviest piece weight approximately 14,000 lbs)


  • Sand Hill Bridge PDF

  • Bridge Resources