Don't know about the reefs but I was on Kelly's Island shoal in 10-13FOW and throwing a rattle trap and got 5 nice walleye in the a.m. Got a couple of 4lb smallies too. After 11:00am the bite disappeared. Then it started up again around 7:30pm. Couldn't stay out there too long as I had a commitment but it was fun. Good luck.

Daryl