The International Lake Superior Board of Control says the lake generally drops about half an inch in March.

The levels of Lake Michigan and Lake Huron rose two inches this month. That’s their typical increase. Both lakes are 9 inches below their long-term average but a foot higher than they were a year ago.

Water levels usually fall from September to March and begin to rise in April.

Lake Superior neared record low levels in 2007 but it’s been edging back to normal. Its level is 6 inches below its long-term average for April 1, but still 5 inches above the level at this time last year.