Shipments of limestone and gypsum from U.S. and Canadian Great Lakes ports totaled 4.7 million tons in July. As in June, the July total represents a slight increase compared to the corresponding period last year. For the season, the Lakes stone trade stands at 17.7 million tons, an increase of 1.7 percent compared to the same point in the 1999 navigation season.
July 2000 | July 1999 | Season-To-Date 2000 | Season-To-Date 1999 | |
| U.S. Ports | 3,906,185 | 3,766,998 | 14,449,136 | 14,360,624 |
| Canadian Ports | 797,908 | 865,060 | 3,224,514 | 3,015,615 |
Total | 4,704,093 | 4,632,058 | 17,673,650 | 17,376,239 |