Maritime NewsSt.Lawrence Seaway’s cargo volumes decline 35 percent Professional Mariner StaffOctober 14, 2009 (CORNWALL, Ontario) — The Great Lakes-St. Lawrence Seaway’s cargo volume fell 35 percent so far this year, the Standard Freeholder newspaper reported. Ship transits were down 25 percent. Still, Seaway officials say no layoffs are planned. Click here to view the newspaper’s story.