Shipments of limestone on the Great Lakes totaled 3,355,389 net tons in May, an increase of 30 percent compared to April and 15.6 percent better than a year ago. However, shipments were down 9.3 percent compared to the month’s five-year average.

Year-to-date the Lakes limestone trade stands at 6.1 million net tons, an increase of 20.3 percent compared to a year ago, but a few boatloads shy of the five-year average for the January-May timeframe.