[PIF]

We know now the ship dropped its port anchor as it was backing down, but it had no effect. We also know that there are ships in the Port, which cannot leave until the bridge wreckage is cleared (weeks, months at a minimum) and that there are 2 anchorages of ships waiting to get in, which will have to be diverted somewhere, plus all hazardous material carriers which used the bridge will have to be diverted, as they are not allowed to use the tunnels

[House Atreides]

“… have to be diverted somewhere, plus all hazardous material carriers which used the bridge will have to be diverted, as they are not allowed to use the tunnels.”
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Oh, goody, now and for many moons they’ll have to use the western side of the Baltimore beltway… as if that doesn’t already have too much traffic congestion.

[glorgau]

It looks like the ship lost power just before heading under the bridge, managed to get emergency generators started which were enough to get the anchor dropped but not enough to affect steerage. Only one anchor dropped and it grabbed enough to slew the ship around into an allision (new word for me today!) with the bridge support that had no dolphin to protect it from ships.

My guess is simply bad timing on the engines and that accidents happen.