How Do I make reservations at Michigan Campgrounds on-line?

To reserve a spot at a Michigan State Park or Recreation Area, go to the Michigan Department of Natural Resources State Park Campground Reservation Page on the Internet. According to their website,

"Many campgrounds are seasonal and may not be available for the dates you select.
Reservations may be made up to 6 months in advance of your arrival date.
New inventory becomes available at 8 AM Monday - Friday and 9 AM Saturday and Sunday."