U.S. shipments of limestone on the Great Lakes increased 4.5 percent from June 2025 to 3 million tons. This June’s U.S. loadings were also above the month’s 5-year average by 6.9 percent.
Year-to-date, the Lakes U.S. limestone trade stands at nearly 7 million tons, a decrease of 7.5 percent compared to last year and 7.2 percent below the month’s 5-year average.
U.S. ports: Calcite, MI; Cedarville, MI; Drummond Island, MI; Marblehead, OH; Port Inland, MI; and Presque Isle, MI. Canadian ports: Bruce Mines, Manitoulin Island, Port Colborne (from August 2017 on) and Smelter Bay (all Ontario).
**As of April 2026, Canadian ports are no longer supplying information on limestone shipments.