I did a little research on docks a few years ago. I believe the maximum length is supposed to be 40' unless bottom conditions require a longer reach. It's up to you to prove it.
I also found out that docks are like glass houses. Nobody who has one wants to start throwing stones at their neighbors'. I even asked on the boating forum "who has a permit for their dock?" and nobody responsed tio that question.
Do a "search" for docks and you will find a ton of information and opinions. I expect you won't have a problem unless somebody files a complaint because you've make your dock intrusive to others.
Good luck!
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