Boosted by above-average precipitation, Lake Superior rose 4 inches in July and is now 5 inches below its long-term average.
The latest update from the U.S. Army Corps of Engineers, Detroit District:
The monthly mean water level of Lake Superior was 601.61 feet for the month of July, which is a rise of 4 inches from June’s level. The average rise for Lake Superior from June to July is 2 inches. The July level was 3 inches above its level of last year, 6 inches above chart datum, and 5 inches below long‐term average (LTA). Lake Superior continues its 14 year stretch of below LTA water levels, the longest period of below average levels in its recorded history dating back to 1918. Precipitation on the Lake Superior basin was above average in July at 161%. The water level of Lake Superior is forecasted to be 12 to 18 inches above record low water levels over the next six months. The Superior level is expected to be 3 to 10 inches above chart datum through December and at chart datum in January. The water levels are forecasted to be 7 to 11 inches above last year’s levels and 3 to 4 inches below LTA over the next six months.