Seaway Opening and Closing Information
Closing of 2020 Seaway Navigation Season
- Radio Messages
- Seaway Notice No. 22
- Seaway Notice No. 21
- 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
Weather Information:
- Accumulated Freezing Degree Days (Dorval)
- Accumulated Freezing Degree Days (St. Catharines)
- Water Temperatures
- Weather Forecasts
- Freeze-up Forecast
- Water Levels and Environmental Data (MLO/Welland)
- Marine Forecasts and Warnings for Canada