Hudson Bridge

Brookline, MA

When Massachusetts Department of Transportation officials decided to replace the existing deteriorated bridge over the Assabet River on SR85 in Hudson, Massachusetts, they wanted to minimize disruptions while providing a minimum service life of 75 years. To achieve that, they specified precast concrete Northeast Extreme Tee (NEXT) beams that were erected in only two days.

The new bridge, with a single span of 85 feet, replaces a three-span granite stone arch bridge. It features seven NEXT 40D beams supported by cast-in-place concrete abutment pile caps on steel-cased micropiles. The new pile-cap abutments are placed behind the existing abutments. It also includes 12 10-inch-thick precast concrete approach slabs that are 7’4” wide and 15 feet long, as well as eight 12-inch-thick precast concrete closure-wall panels that are 5 feet tall and 13’1” long at their maximum.

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Projects details

  • PrecasterJ.P. Carrara and Sons Inc., Middlebury, VT

  • OwnerMassachusetts Department of Transportation, Boston, MA

  • DesignerJacobs Engineering, Boston, MA

  • General ContractorNew England Infrastructure Inc., Hudson, MA


  • 7 NEXT 40D beams (7’6” wide providing out-to-out bridge width of 57’9”)

  • 12 10-inch thick precast concrete approach slabs (7’4” wide x 15’0” long)

  • 8 12-inch-thick precast concrete closure wall panels (5’ tall x 13’-1” long maximum)

  • 85-foot single-span bridge replaces three-span stone-arch.

  • 10,000-psi concrete strength used to meet AASHTO and MassDOT design requirements for the required span and widths of the new beams

  • Approximately 58 feet wide and includes 12-foot shared travel and bike lanes in each direction along with 4-foot-wide shoulders and 5-1/2-foot-wide sidewalks

  • NEXT beams erected in two days despite site restrictions.

  • UHPC closure-pour joints installed