very few anchorages
on lake st clair, especially for deep draft
Only real protected spot is the lagoon
next to Metro Beach, up Black Creek. Make sure you do not cut the approach to Black Creek.
If you are shallow draft
, there are a few more places but not many. Fords Cove at the NE tip of Grosse Pointe or Gaukler Pointe. But I think you need to be about 3' or less. Muskamoot bay is even shallower, perhaps only 2.5' these days. There are some open spots for daytime short stay in the right conditions.