Four-season navigational buoys
Learn about our buoys in the St. Lawrence River, the advantages of four-season buoys and the different models.
On this page
- Buoys in the St. Lawrence River
- Advantages of four-season over seasonal buoys
- Buoy models
- Related links
Buoys in the St. Lawrence River
The Canadian Coast Guard is deploying 184 four-season lighted navigational buoys in the St. Lawrence River shipping channel between Quebec and Montreal. This follows a contract awarded in late 2018. These buoys are designed to withstand the severe ice and tidal conditions found in the St. Lawrence. The installation of the buoys began in early 2019 and will continue into 2020.
Four-season buoys help to improve navigational efficiency and safety to mariners.
Advantages of four-season over seasonal buoys
We’re replacing our seasonal navigation buoys in the St. Lawrence River between Quebec and Montréal with these new four-season buoys.
Seasonal navigational buoys only provide 6 to 8 months of lighted navigation. They need to be deployed every spring and switched out every fall. Once out of the water, they must be inspected and repaired.
The new four-season buoys allow us to operate more efficiently. They can withstand very severe ice conditions. The ice flows around the buoy or, in the worst conditions, tilt the buoy and flow over it. When the ice recedes, the buoy returns to its upright position.
Four-season buoys remain in the water year-round, providing increased lighting, dependent on ice conditions. In addition, they only require service and maintenance every 2 to 4 years.
We developed 2 different four-season buoy model sizes to deploy in the St. Lawrence shipping channel. These 2 model sizes are the 1.3 metre and the 0.7 metre, each best for different water depth conditions.
A 0.7 metre model
Dimensions and specifications
|-||1.3 metre model||0.7 metre model|
|Length||9.5 metres||8.7 metres|
|Mass||4,000 kilograms||2,100 kilograms|
|Hull diameter||1.3 metres||0.7 metres|
|Air draft||2.5 metres||2.0 metres|
|Tilt angle||Less than 6 degrees at 5 knots||Less than 6 degrees at 2.5 knots|
|Water depth||9 to 30 metres||9 to 25 metres|
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