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NVCA warns of possible dangerous ice conditions

January 16, 2025   ·   0 Comments

By Brian Lockhart

The Nottawasaga Valley Conservation Authority has issued a provincial watershed conditions statement about safety in the region.

A recent cold front moving across the province is bringing cold, sub-zero temperatures and sustained winds to southern Ontario with temperatures expected to remain anywhere from -5°C to -15°C.

Frazil ice is currently forming in some areas of Ontario. Frazil ice is a collection of loose, randomly oriented ice crystals that form during the winter in rivers, lakes, and reservoirs where the water is in a turbulent state.

Stream levels and flows are still elevated in areas that experienced warmer temperatures and snow melt and rain. However, the cold snap and forecast cold weather conditions are ideal for the formation of frazil ice on open water approaching zero degrees.

Lack of ice cover and exposure of the water surface to cold temperatures or wind chills below -18°C can trigger the formation of frazil ice. Frazil ice can accumulate quickly on bridge abutments, piers, and riverbanks.

As a result, water levels can rise quickly upstream of areas susceptible to frazil or anchor ice constrictions and may lead to localized high-water conditions or flooding in vulnerable areas.

The NVCA is urging residents to exercise caution around all bodies of water and are advised to stay away from all watercourses, bridges, culverts, and dams. Alert any children under your care of these dangers and supervise their activities.

The NVCA continues to monitor river and stream conditions and will issue additional messages as conditions warrant.

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