Lake Superior's level

Posted at 10:20 AM on June 25, 2012 by Bob Collins (3 Comments)

There's been a mostly fun conversation over the last week on the effect of the Duluth flood on Lake Superior water level.

What's the impact been so far?

Here's the latest water level gauge from the Canadian side, in Thunder Bay, Ontario.

The gray line is 602 feet. Most of the time the lake has been above that level this year has been int he last week. It was three days after the storm before the lake reached its peak of about 3 inches higher, and it's been dropping since.

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Comments (3)

3 inches or 3 feet? Units on the left are meters...

Posted by BenCh | June 25, 2012 12:57 PM

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3 inches. Also, the gray line is at 601 feet (not 602).

Lake Superior is typically at it's lowest in March and highest in September, with a typical change of about 6". Over the past 100 years, levels in Superior have been more stable than the other Great Lakes.

Here is a cool NOAA website with great lakes data.

Posted by kennedy | June 25, 2012 1:52 PM

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Since the chart is in tenths of meters (10 cm) and there are approx. 2.5 cm/in one marking would be about 4 inches which would show a surge of around 8 inches at the peaks and since the drop off is to under 0.1m that would be consistent with 3 inches.

Posted by JackU | June 25, 2012 2:49 PM

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