St. Lawrence Seaway Management Corporation

Seaway Opening and Closing Information

Opening of 2020 Seaway Navigation Season

• Radio Messages
• Seaway Notices
• Notices to Shipping – Montreal/Lake Ontario
• Notices to Shipping – Welland Canal
• FAQ – Navigating the Great Lakes St. Lawrence Seaway Under COVID-19
  Updated : April 9, 2020

Ice Information:

• Canadian Ice Service – Latest Ice Conditions
• Canadian Coast Guard – Ice Charts
• Canadian Coast Guard – Ice navigation in Canadian Waters
• Outlook for break-up of Ice (Issued Feb 2nd, 2020)