Undercurrents: beneath the obvious

June 1, 2007

Lake Superior outflow increased by another 2% for June

Filed under: Great Lakes News,Lake Levels — nemo @ 7:43 pm

For the second month in a row, Soo Today reports that the outflow from Lake Superior into Lake Michigan-Huron will be increased although Lake Superior and Lakes Michigan-Huron continue to be well below their long-term averages for May:

The International Lake Superior Board of Control, under authority granted to it by the International Joint Commission, has set the Lake Superior outflow to 1,530 cubic metres per second (m3/s) (54.0 thousand cubic feet per second (tcfs)) for the month of June.

This is the outflow recommended by the regulation plan for the month of June and is an increase from the May outflow, which was 1,500 m3/s (53.0 tcfs).

Currently, the Lake Superior level is about 53 cm (21 inches) below its long-term average beginning-of-June level, and is 40 cm (16 inches) below the level recorded a year ago.

This past month the level of Lake Superior rose 3 cm (1 inch), while on average it rises by 10 cm (4 inches) in May.

The level of Lakes Michigan-Huron is now about 47 cm (18 inches) below its long-term average beginning-of-June level but is 8 cm (3 inches) lower than it was a year ago.

The May outflow increase was almost 9% while the International Joint Commission (IJC) proposes a study of water levels and near-historic lows in Lake Superior are turning the largest coastal wetland in the Great Lakes into dry land.

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