Key Bridge, Baltimore, has collapsed.

JASR said:
They will need to build a similar ‘high’ bridge though, because the obstruction to road traffic is minor compared to the obstruction of sea traffic , which now can’t get in/out, and that wont be alleviated by a quick road bridge.

It’s a pretty major economic hit for Baltimore, the US and the world.
Click to expand...
Expanding on the economy side (and I haven’t looked/know details, just thought process):
The ship was a large container one, which means Baltimore is a large seaport with serious amounts of cargo in/out. Anything landside of the bridge isn’t going anywhere for awhile (think Suez Canal blockage), so that’s X number of container ships removed from the world trade (and its containerisation/ships that have driven the world economy so well in the past 50 odd years). You then have the ships currently enroute to Baltimore, they will need to be re-routed to other destinations, and the logistical nightmare of getting the contents to the right place from a different port. (And getting the stuff in Baltimore to another port).
I’m unsure on container ports capacity, but you would think they operate up in the high 80-95% range, so losing Baltimore puts strain on the remaining nearby ones, and throws a very large spanner in the shipping scheduling (as per suez and Houthi).

The Suez blockage caused serious issues in the supply chain, Baltimore isn’t perhaps a severe an issue in the short term, but the need to remove/rebuild bridge makes it a longterm serious issue.
 
civil and structural engineer Julian Carter, says bridges such as the one in Baltimore are "very weak at points".

He says the "catastrophic collapse" of much of the bridge was because everything along the structure is "interconnected".

Other large bridges may have central piers where the main structure is disconnected from the rest, but in this case the interconnected nature of the bridge means "when you take out one part of it, the interconnected system fails".

Mr Carter says the "lightweight structure" was likely tested at some point for a ship collision.

This may have been suitable at the time, he says, but container ships are now "twice the size".

The engineer adds that he expects many ports and bridge piers will need to be risk assessed for similar situations.
 
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