2018-May-24
May 18, 2018 Water Level
The Great Lakes water levels are all above their long-term average May levels. Lake Superior is 2 inches lower than it was at this time last year, while lakes Michigan-Huron, St.Clair, and Erie are 5, 6, and 3 inches respectively, above last year’s levels and Lake Ontario is 23 inches below its level from a year ago. Over the next 30 days, Lake Superior, and Lake Michigan-Huron are projected to rise 3 inches each.
Lake Superior’s outflow through the St. Marys River and Lake Michigan-Huron’s outflow through the St. Clair River are forecasted to be above average in May.
The current projection is that the high this year will be much the same as the highest level in 2017 as per the chart below:
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