Limestone shipments on the Great Lakes totaled 248,080 net tons in March, an increase of roughly 100,000 tons compared to a year ago. Because so much stone is washed before loading, the trade generally does not resume in earnest until temperatures warm in early April.
March 2002 | March 2001 | Season-To-Date 2002 | Season-To-Date 2001 | |
| U.S. Ports | 184,445 | 76,867 | 184,445 | 76,867 |
| Canadian Ports | 63,635 | 75,276 | 63,635 | 75,276 |
Total | 248,080 | 152,143 | 248,080 | 152,143 |