May 16, 2021 Water Levels Report

Water levels continue to be well above average and near record high levels. However, this month predicted outflows from Lake Superior into the St. Mary’s River are predicted to be only average, not above average as they has been for at least 2 years. This shows that, under Plan 2012 balancing, the flow into Lake Michigan-Huron continues to be reduced. Lake Michigan-Huron continues to be below the level it was at this time last year – see graph below. All the lakes are now lower than they were at this time last year.

From a month ago the water levels on Lakes Superior, Michigan-Huron, St Clair, Erie and Ontario are up 0, 0, 2, 2 and 5 inches respectively. Lakes Superior, Michigan-Huron, St Clair, Erie & Ontario, are lower by 5, 15, 14, 13 & 24 inches, respectively, than they were at this time last year. Lakes Superior, Michigan-Huron, St Clair & Erie are 5, 18, 17, & 14 inches, respectively, above their long term May average, whereas Lake Ontario is 11 inches below. All the lakes are now well below their May record highs.

In a month’s time, the levels for Lakes Superior, St Clair, Erie & Ontario are expected to be up 0-3 inches with Lake Michigan-Huron expected to be up 3 inches.

High water levels and potentially record high water levels are expected to persist for at least the next six months, so flood prone areas are expected to remain vulnerable.

 




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