Does a 12 foot rowboat need to be registered under Michigan state law?

Yes, under Michigan state law, a 12-foot rowboat does need to be registered if it is powered by a motor or if it is used for recreational purposes on public waters. However, if the rowboat is solely human-powered (like a canoe or kayak) and does not have a motor, it does not require registration. It's always best to check with the Michigan Department of Natural Resources for the most current regulations.