{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["021:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "Bureau of Transportation Statistics", "hasEmail": "mailto:bts@dot.gov"}, "description": "The Great Lakes St. Lawrence Seaway\u2019s navigation season generally begins in late March and closes in late December. Opening and closing dates vary from year to year.", "identifier": "https://data.transportation.gov/api/views/m8js-a9a4", "issued": "2026-04-27", "keyword": ["commercial tonnage", "gls", "great lakes-st. lawrence seaway", "seaway", "st. lawrence seaway", "tonnage", "vessel transits", "waterways tonnage"], "landingPage": "https://data.transportation.gov/d/m8js-a9a4", "license": "http://www.usa.gov/publicdomain/label/1.0/", "modified": "2026-04-27", "programCode": ["021:053"], "publisher": {"@type": "org:Organization", "name": "Bureau of Transportation Statistics"}, "theme": ["Maritime and Waterways"], "title": "Great Lakes St. Lawrence Seaway Tonnage"}