NWP Company Barge Incidents

  • Engineering

16 Apr 2018

NWP Company’s Black Point bridge crosses over the Petaluma River in Northern California. The bridge consists of one swing spans that spans a total of 294 feet and timber approaches on each end. In March and April 2018, two separate barge accidents happened at the Black Point Bridge which damaged the steel truss and the timber fender protecting it.

The first barge strike damaged the right truss diagonal. ARE-AirShark’s senior Bridge Engineer inspected the bridge and determined that trains could temporarily use the bridge until repairs were made. ARE AirShark’s engineers designed a repair for the damaged diagonal that was cost effective and did not require a long duration shutdown.

The second barge strike damaged the fender protection system. The fender system is critical in protecting the bridge due to the high mariner traffic at this river. ARE-AirShark assessed the damage and provided the client repair plans for the timber fender replacement. Piles that could be reused were identified by ARE-AirShark to provide cost effective repairs. ARE-AirShark also provided construction supervision during the replacement.

The two Black Point Bridge incidents occurred so close to each other that inspection and repairs needed to occur immediately. ARE-AirShark’s provided an emergency inspection and cost-effective replacements and repairs.

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