Originally built in 1898, the Charlestown Bridge, today known as the North Washington Street Bridge, connects Boston’s North End neighborhood to Charlestown, MA. This 1,000 foot span was built with 11 piers to carry vehicular, subway and pedestrian traffic over the Charles River. The new structure being constructed by J.F. White Contracting Company will include just 5 spans, opening the navigation channel to 141 foot thereby greatly improving boat traffic.
To construct the structure, vehicle traffic was diverted to a temporary bridge constructed by J.F. White. The temporary bridge is supported on driven open-ended 30-inch diameter x 0.5 inch wall steel pipe piles. GTR performed pile driving consulting and dynamic pile testing for JFW throughout bridge construction.
The new bridge is founded on forty (40) 6-foot diameter drilled shafts. JFW retained Trevi-ICOS of Charlestown, Massachusetts to install a total of forty (40) six (6) foot diameter drilled shafts, extending approximately 90 feet below working elevation. Trevi-ICOS engaged GTR to GTR perform Cross-hole Sonic Logging, reporting and consulting on all drilled shafts. For select shafts, GTR performed Crosshole Tomography (CT).
