This month, Lake Superior measured about 9 inches above its long-term average but almost 5 inches below its levels from last July. Lakes Michigan and Huron were recorded at nearly 2 feet above their historic average and a half inch higher than a year ago. Still, the Lake Superior board expects to increase the flow to 2,800 cubic meters per second this month — more than enough to fill an Olympic-size swimming pool each second — and above the amount called for in the most recent regulatory plan for balancing the lakes.