To keep track of the Great Lakes water levels...

http://www.glerl.noaa.gov/data/now/wlevels/dbd/

Ok I played around on this site for awhile. I could not figure out if all the rain and flooding we had this week in the Chicago area helped the Lake Michigan water level? I'm guessing it probably didn't have that much impact?

Looks like it is somewhat cyclical for the past 100 years.
Last year launching out of Grand Haven in November I was hitting the bottom at the launch that I used all summer, and was somewhat low all summer. When heading out of the channel the low water levels uncovered docks and steps that I had never seen in the last 20years of launching out of GH. Talked to an older gentleman and he said 50 yrs ago that is how low the water was. According to the above link he was right.
Who knew...