Lake Michigan Water LevelsJuly 11th, 2012 at 1:00 am by Bill Steffen under Uncategorized
Picture of a Lake Michigan sunset at Sleeping Bear Dunes (look how calm the water is). Here it is full screen (from Mark at ReportIt). The water level of Lake Michigan stayed the same over the past month, but is now 8″ below the level of one year ago. It’s 20″ below the long term average for July and 11″ above the low-water mark of 1964. Lake Superior has gained water after heavy rain fell in the Duluth area (9″ in 2 days). Superior is up 6″ in the last month (over 3 TRILLION gallons of water added to the lake in just a month!) and is now 3″ above the level of one year ago. Both Lake Ontario and Lake Erie have dropped with the dry conditions this early summer. Erie has lost 3″ in the last month and is now 5″ below the century average. Ontario is down 2″ in the last month and is 6″ below the century average. The water level of the Eastern 2 lakes can vary significantly over a relatively short period of time of several months, while the other 3 Great Lakes are slower to change. Since 70% of the equation for the water level of Michigan/Huron is the water coming down the St. Mary’s River from Lake Superior, the gain in water to the north should keep Lake Michigan from getting too low if these drought conditions persist through the summer.