The design of a lot of the covered slips makes me think that even with more modern construction, some significant fire protection would be a big benefit. Sense a fire on one of the boats, have sprinklers dump a ton of water on both sides of the boat and spray water sideways over the top (under the roof) with the hope of containing the fire to the boat of origin while the fire department makes their way over and the neighboring boats GTFO if possible.
Well, sprinklers would be very challenging to get the fire and not the boats. However, there are some basic steps that are taken in new construction.
1. Concrete or other material other than wood.
2. Pitched top with opening in the middle for fire to rise and escape.
3. Fire pump and hose at dock. There's plenty of water available, just use it.
4. Updated electric systems on docks and on boats.
5. No space heaters allowed.
6. Any propane must be kept in fire proof locker.
7. No smoking.
8. Smoke and fire alarms on the docks themselves. This means no grilling on covered docks.
In addition there are questions as to whether any of the houseboats should be allowed on covered docks.
One topic I expect to arise and wish it wouldn't is liveaboards. However, they come in all quality and types and it's clear this marina was pretty much an anything goes marina.
Since regulations were tightened years ago on the lake we lived on in NC, there have, to my knowledge, been no new covered marinas. Several new marinas built, all open.