By Tom Spears, Ottawa Citizen, September 9, 2016
There are blue-green algae in the Rideau Canal, sampling by Ontario’s Environment Ministry confirms, and this makes contact with its water potentially dangerous.
The Rideau River is not affected.
Ottawa Public Health has immediately put out guidelines:
http://ottawacitizen.com/news/local-news/officials-issue-warnings-as-blue-green-algae-confirmed-in-rideau-canal