The Wisconsin Department of Natural Resources and the Wisconsin legislature have established new rules for piers placed into Wisconsin waterways.  Please click on the link below and this will direct you to the DNR website.  This is on a PDF file.

http://dnr.wi.gov/org/water/fhp/waterway/factsheets/piers2009.pdf

The following link will take you to the Wisconsin DNR webs site for obtaining pier permits and other information.

http://dnr.wi.gov/org/water/fhp/waterway/piers.html