• Corporate HQ, NY
  • Melville, NY
  • Iselin, NJ
  • Ossining, NY
  • Mount Laurel, NJ

2010-2013 Arrigoni Bridge Biennial Inspection and Analysis


As part of its 2010-2013 biennial bridge inspection for the Connecticut Department of Transportation (ConnDOT), HAKS provided comprehensive inspection and evaluation services on the Arrigoni Bridge, which carries Route 66 over Route 9 and the Connecticut River between Middletown and Portland, Connecticut. This structure, constructed in 1938, consists of 28 approach spans and two 660-foot through tied-arch truss spans—the longest bridge of this type in Connecticut. 

The project entailed a detailed inspection, including the suspended cables, and load rating computations in accordance with the AASHTO Manual for Bridge Evaluation. The through arch trusses and girder/floorbeam/stringers were inspected hands-on using manlifts, snoopers and climbing techniques to document section loss and as-built and as-rehabilitated structural details. Numerous floorbeam suspender locations were also observed over several cycles of live load. The main span concrete-filled steel grid decks suspended by cables had severe deterioration, including delaminated concrete and section loss to the main bars. The approach span reinforced concrete decks had extensive spalls with exposed/debonded rebar. There were random areas of abrasion rust/bleeding rust/pack rust between the deck and stringers. 

ConnDOT immediately implemented emergency repairs to the main span decks. HAKS revised the load rating analysis based on the current as-inspected condition. We performed the first LRFR load rating for this complex bridge in accordance with the latest AASHTO and FHWA guidelines. 

The project received the 2012 ACEC Connecticut Engineering Excellence Award.