A rainy April wasn’t enough to keep Lake Superior levels from falling. Although the two-point-six inches of rain in April was above average, precipitation over the last 12 months was actually five inches below average. A chart from the U-S Army Corps of Engineers shows Lake Superior will remain at above-average levels for the next six months – despite the deficit in rainfall. The big lake is four inches lower than last year at this time, but almost eight inches above its long-term average. The other Great Lakes all got below-average precipitation, but their levels remain above the long-term norm.