30 miles from the bridge does not afford much "fetch" or open water to build those waves. I suspect the waves hitting western Michigan and Ontario were very significant, and likely even the big boats stayed put.
I have been in both lakes when the waves were much bigger than 10 feet and whole sailboats with tall rigging would disappear between the waves sailing just 50 feet away. You are wearing life gear, and tied in, and hanging on...for sure. When waves of that height get going you no longer try to make your destination; you simply try to quarter the waves and keep the right side up. When all else fails, you run with it til the blow lets up.