Worst bridge you’ve crossed?

I've crossed the Chesapeake Bay Bridge-Tunnel exactly twice, once going northbound, the second time was on the return trip southbound. I'm not a fan of it.
https://en.wikipedia.org/wiki/Chesapeake_Bay_Bridge–Tunnel

I'll throw out a couple that have not been mentioned yet, both in Louisiana.

First up,
Lake Pontchartrain Causeway (is advertised as the world's longest bridge and it basically goes north out of New Orleans across Lake Pontchartrain to Covington on I-12).

When Hurricane Katrina hit New Orleans, for a long time afterwards, the Causeway Bridge going east-to-west from Slidell to New Orleans was out of commission due to it being damaged and had to be rebuilt. The quickest was for trucks delivering into NOLA from the east was to stay on I-12 and take the Lake Pontchartrain Causeway bridge south back into New Orleans.

I've crossed it several times, but only once in the fog and that time wasn't fun.
Lake Pontchartrain Causeway - Wikipedia

The other:
The Huey P. Long Bridge that connects the East Bank of the Mississippi River to the West Bank of the Mississippi River in New Orleans.

This bridge is 3 lanes each way, but those lanes are narrow and it has a train track separating the northbound side from the southbound side. Trucks have been known to take each others mirrors off as one truck passes another and law enforcement has no issue writing tickets if you take up more than your lane.

I've crossed it once, and there was a train crossing it at the same time. I've learned how to completely avoid that bridge because I'm not putting myself in a position where there's even a chance to be on that bridge with a train again.
Huey P. Long Bridge (Jefferson Parish) - Wikipedia

 

Are you talking about the 55 MPH bridge from BR to Lafayette? If so, I don't think that one is too bad. It's long with a slow speed limit. but it is also flat, minus the one exception of when it crosses the river near the west side, and even there it isn't very high.

 

I’ve done the one on 13 on a bike once.

 

You’re thinking of Hurricane Agnes of ‘72. I’ve heard that story myself. Every gate was open and it still wasn’t enough, so there was talk of blasting out the northern section of the dam.

 

I've never ridden a bike very much, but what little I have, I cannot imagine going across that bridge on a 2-wheeler.

I tip my hat to you because there's no way I could make that trip.