Can anyone in the st clair area give me a good idea of its location, thanks

If you can find Gull Island or Harsens Island you have found Muscamoot Bay.

There are some maps on lakestclair.net to give you a better idea of what you're looking for, check them out, then get back here and ask away, most of us locals are out there every weekend. There is gull island, and muscamoot bay, but no muscamoot island, they are both right next to each other though, and where are you coming from, a launch, or the detroit or st clair river?