I know of NO publication that lists even 1/3 of the total CG's in the State of Michigan. Several years ago a friend naturist who worked for the Michigan DNR out of Hoffmaster SP 5 miles north of Grand Haven told us that there are nearly 4,000 total individual CG's in the state. Unfortunately he'd passed away a few years after so can't ask him again. Most not listed in publications are small and rustic and usually signified as being part of a group of CG's belonging to and maintained by another more mainstream state, county, National Forest or State Forest jurisdiction or affiliation body. Many were listed as CG-1, CG-2, CG-3 etc in the past but many are now known by names attributed to local features or explorer/founder etc. Such as a creek, river, or bay or a woods or a name/description of the one time land owner etc.
As is well known that Michigan is still today over 51% forested with vast state forests and national forests and state park lands. Over 100 state parks with 27 of them being over 1,000 to 59,000 acres in size. Michigan has more than 11,000 inland lakes not even including shoreline on the 4 of the 5 Great Lakes which has over 3,200 miles of shoreline alone. Michigan has more than 87,000 miles of rivers and streams and CG's are everywhere!
Because of the state having these various attributes and features, CG are extremely popular and everywhere in the lower peninsula and the Upper Peninsula.
Been years since I've even seen lists, pamphlets, or any publications or talking to the local DNR as to where gobs of these rustic CG's are located but we keep seeing them in our travels around the state on side roads and many on dirt roads in the northern half of the state as nearly 90% of the state's 10 million population lives in the southern half of the Lower Peninsula. The vast entire Upper Peninsula has roughly only 300,000 population so there's incredible land for camping to be had.
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