We were in Florida earlier this month and went to Key West for the day - shore diving is pretty non- existent - that said we stopped at a place Old Bahia Honda Bridge - we spoke to a bunch of FWC guys on the path.
They mentioned although it looked like a great place to dive - the currents under some of these bridges were unmanageable and they often were pulling divers out of the water.
So - I am a risk taker but wherever you decide to dive - take a flag - you may need it to signal someone and be wary of the currents and how to get back out of the water should the currents pick up.
Have fun and if you find a good place let us know or shoot me a message.
Thanks