Welcome! Nice to see another Wisconsinite on the forum! I am unfamiliar with quarry ponds but I'd say DO is a good place to start. Test for DO (dissolved oxygen) at various depths of the pond. This will tell you if trout can live in the pond and if some form of aeration is necessary. Also, are there any shallow zones? Is it all 50+ feet deep? What is the average depth? If there is enough relatively shallow water that opens up your options. Also, what existing fish are there? In a quarry pond I'd imagine they would be hard to get rid of.

0.7 acre pond stocked 2020, LMB, PS, YP.