[cripplecreek]

Or the above average rainfall for the last couple years.

[LukeL]

Also a couple of years ago we had a very cold winter with near 100% ice coverage on the lakes. This prevented a whole ton of evaporation that usually occurs in the dry winter.

Also I remember reading an article that massive dredging on the Great Lakes led to a drop in lake levels.

[ConservativeInPA]

Or the above average rainfall for the last couple years.

You are not implying that there is correlation between rainfall and lake levels, are you? We would need a complex computer model to determine that.