Delaware Riven Joint Toll Bridge Underwater Inspections



Delaware River Joint Toll Bridge

Commission (DRJTBC)


Underwater Bridge Inspections

and Fathometric Surveys


In 2005 W.J. Castle, P.E. & Associates, P.C. was retained to inspect 21 DRJTBC bridges. The bridges are all multi-span structures that cross the Delaware River and connect the states of New Jersey and Pennsylvania. The bridges extend from Trenton, NJ north to the NY border. Inspection was performed using both line tended SCUBA and surface supplied air. The dive team consisted of three persons under the direct supervision of a Licensed Professional Engineering/Diver. All inspections were performed from a small dive boat. The water level varied based upon weather conditions with a maximum depth of approximately 18 feet. The inspections were performed over a three month period starting in July 2005. Written reports for each bridge were prepared in accordance with NJDOT and PADOT specifications with recommendations and costs for all repairs. All reports were prepared and completed by December 2005.

In the early spring of 2006, extensive flooding occurred along the Delaware River which resulted in high water levels and velocity that adversely affected the 21 bridges. The inspections performed in 2005 revealed scouring and/or undermining activity at several of the bridges and the flooding created a potential hazard to the structures. As a result of this flooding, CASTLE was retained to perform another underwater inspection of all the 21 bridges. These bridges were inspected and reports completed by November 2006. The bridges found to have severe undermining as noted in the second cycle of inspections are currently out for “bid”.


~ by castle2268 on October 22, 2008.

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