Great Lakes Water Levels and Ice Cover UpdateMay 9th, 2014 at 1:36 am by Bill Steffen under Bill's Blog, News, Weather
The Great Lakes water levels continue their spring rise. Lake Michigan/Huron is up 1″ in the last week, 8″ in the last month and 12″ in the last year. That’s a very significant year-t0-year rise. Same for Lake Superior, which is up 2″ in the last week, up 6″ in the last month and up 13″ since May 2013. Lake Erie is up 2″ in the last week, up 6″ in the last month and up 8″ in the last year. Lake Ontario is up 1″ in the last week, up a whopping 15″ in the last month and up 9″ year-to-year. Three of the five Great Lakes now have water levels above the century average (Erie up 1″, Superior up 2″ and Ontario up 4″). Lake Michigan/Huron are 10″ below the century average, partly or entirely due to dredging the St. Clair River. I’ll add that Lake St. Clair is up 6″ in the last month and up 11″ in the past year. The Army Corps of Engineers expects the water level of the lakes to rise 1 – 6″ in May. Lake Superior’s flow down the St. Mary’s River is expected to be above average during May.
The 5/9 ice percentage shows 2% ice cover on Lake Michigan. Lake Superior still shows a 31% ice cover, Lake Huron is at 8%, Lake Erie (the southernmost Great Lake) is at 0.1% ice cover and Lake Ontario is totally ice free. Total Great Lakes Ice Cover is at 15% on 5/9. That’s the most ice we have ever had on the Great Lakes this late in the year.