Center Console Boats And More

Canal access blocked by neighbor in Michigan. Who has jurisdiction and what are the rules??

Our neighbor built his dock about 18" too far into the canal (the lake is on the other side of his dock). I was planning on getting a 24' pontoon boat but it will not fit.

He spent a lot of money and this will not be pretty but his actions have lowered the value of my house and has kept me from getting the boat I want.

Any suggstions as to who to contact first to find out what the rules are and who as jurisdiction?
I do not want to talk to my neighbor unless I am legally correct in asking him to make a change.
We live on the nicest canal on Cass Lake, Oakland County, MI