I fish for Cisco/ herring around Drummond every year..
Cisco come out of lake Huron every year to gorge themselves on Mayfly larvae..I would be willing to bet there are some schools that travel down the SCR into Lake St Clair every year but I've never targeted them. They can be a challenge to fish for and you have to really target them by looking for large active mayfly hatches..
We fish with 8 ft ultra light rods and ice fishing rigs tied to flourocarbon...They are super light biters..