Here is a link to the MI DEQ Wetlands Map Viewer.
MI DEQ Wetlands You'll have to play around with it a bit, but it should give you a good indication if your pond location is in a wetland area or is part of the national wetland inventory. Most ponds show up on this inventory. You can also measure distance and area.
They do mention that it is only a guide!
Hope this help's clear things up a bit.