You cannot just throw up a pier for your boats and personal watercraft. There are rules to govern pier lengths, etc. The law is intended to help assure everyone at a lake has an opportunity to enjoy the water.
LENGTH OF YOUR PIER IS LIMITED
In general, private resident piers must meet the following criteria:
Piers installed for commercial use require a permit, as do private piers that do not meet the above requirements or the length restrictions shown below:
Subject to the above:
If the water depth, extending from the shoreline out to 150, is six feet or less, maximum pier length is 150 feet.
If the water depth exceeds six feet continuously after reaching 75-feet from the shoreline, maximum pier length is 75-feet.
If the water depth varies, but is not continuously more than six feet in depth from the shoreline extending out to 150 feet, then maximum pier length is 150 feet.