Generally speaking I've found both the towns and DES to be really good about "grandfathered" structures. With the homes I've owned on the lake I've had more than a few non-conforming situations and I'm reasonably certain that there are even rules protecting you. In reality anything built prior to about 2000 probably wouldn't be meet current building codes.
Its my understanding that the only thing that could get you in real trouble is if the seller had just done a bunch of work prior to selling it to you or if you were planning on adding on to something that was already nonconforming.
For the deck you can always look at Google earth's historical pictures and see what the dock looked like 10 years ago. If it was the same that long ago you should be in the clear.
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