Rising water levels in the St. Lawrence Seaway could cost the economy more than $1 billion, shippers and port operators say. A new study from the Chamber of Marine Commerce warns that opening the floodgates further at a dam in Cornwall, Ont., would wash away between $1 billion and $1.75 billion in revenue for businesses on both sides of the border. A board of control recently increased the flow at the Moses Saunders Dam — the only control point on the St. Lawrence Seaway, which includes the Great Lakes — to allow 10,400 cubic metres of water per second out of Lake Ontario.
A large swath of Ontario is struggling to stay above water as heavy Friday rainfall exacerbates flood concerns in multiple regions. Heavy rain started in Toronto and much of southern Ontario in the morning and stretched through the afternoon. Some areas could see the rain change to flurries overnight. While Torontonians merely needed to pack an umbrella, residents about 150 kilometres north, in the towns of Bracebridge and Huntsville, are grappling with a more dangerous situation.