Frazil ice forming in parts of the watershed

The Nottawasaga Valley Conservation Authority advises that the Ministry of Natural Resources has issued a Provincial Watershed Conditions Statement.

A cold front has been moving south across the province of Ontario bringing cold, sub-zero, temperatures and sustained winds to the southern Lake Superior coast and southern Ontario, continuing this weekend into next week. Daytime temperature highs are forecast to remain anywhere from -5°C to -15°C.

Frazil ice is forming in some parts of the watershed. Stream levels and flows are still elevated in areas that experienced warm temperatures, snowmelt and rain last week; however, the cold snap and forecasted 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 and/ or wind chills below -18°C can trigger the formation of frazil ice.

The slushy ice can accumulate quickly on bridge abutments, piers, and riverbanks. Consequently, 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 invulnerable areas.

“Please exercise caution around all bodies of water. The public and especially children 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. Please avoid driving through flooded roadways,” said NVCA Flood Duty Officer Jared Robertson in a Watershed Condition Statement.

For updates, visit www.nvca.on.ca.