The 180-metre bulk carrier Strategic Alliance hit the movable section of the Tacony-Palmyra Bridge in Pennsylvania on Thursday, causing structural damage and road traffic disruption on both sides of the Delaware River.

The incident occurred around 1.15pm local time when the bridge was open to allow vessels to pass. The handysize bulk carrier, built in 2013, crashed into the structure, damaging part of the movable part and temporarily stopping the bridge from closing. The crash created significant traffic delays in both directions. No injuries were reported.

The ship then sailed to the Kinder Morgan terminal in Bristol, Pennsylvania, where it tied up. The US Coast Guard then came on board to inspect the vessel.

The bridge, opened in 1929 and used by up to 76,200 vehicles a day, was reopened to traffic at about 8:40 p.m. But one lane remained closed for continuing repairs. Authorities are investigating the collision to determine the cause and circumstances.

Baltimore disaster shines spotlight back on bridge protection

The latest incident comes amid stepped-up efforts by U.S. authorities to reduce risks posed by commercial ships to vital bridge infrastructure. The need for such actions became more acute after a disaster in Baltimore in March 2024 when the Singapore-flagged container ship Dali hit the Francis Scott Key Bridge, causing its collapse and killing six construction workers.

In September 2026, the US Coast Guard finalised a comprehensive security vulnerability assessment of bridges and port infrastructure at 11 ports. The report recommended 20 improvements to maritime risk management and protection of infrastructure.

Heavy investment in protective infrastructure.

There are a number of projects underway to harden bridges against possible vessel strikes. In Maryland there is a $177m programme under way to increase the durability of the Chesapeake Bay Bridge. The initiative also provides for the construction of additional protective structures around the supporting pillars of the bridge to reduce the consequences of a possible collision with ships.

At the same time, rebuilding of the Francis Scott Key Bridge includes safety improvements. The new design features reinforced pier foundations and specific collision protection systems that can withstand impacts from large commercial vessels.

The crash on the Tacony-Palmyra Bridge is the latest in a string of events that highlight the vulnerability of large transport infrastructure to marine accidents and the need for robust protection systems as commercial shipping continues to share the seas with critical road and port infrastructure.