Three of us went for a very nice dive on a wreck just outside Toronto Harbour. Information about the wreck can be found here: http://www.scubatoronto.com/divesites.asp?siteID=9
The top of The Southern Trail is in 6 meters of water and the bottom is at 10 meters, so this is a great dive for everyone. The wreck is sitting just like the dive site pictures and it is possible to swim under the overhang shown on the drawing and penetrate the ship.
We had a great night with no waves, no wind and fairly warm water for Lake Ontario.