When water begins to freeze on rivers, lakes, the Rideau Canal and other open bodies of water, it may look solid but is often still dangerous. If you want to go out onto the ice, remember the thickness should be:
As a guideline, clear blue ice is usually the strongest; white opaque or snow ice is half as strong as blue ice. Grey ice is unsafe. The greyness indicates the presence of water.
Before venturing onto the ice, check the Lifesaving Society's guidelines for staying safe, and review guidelines by The Canadian Red Cross on what to do if you get into trouble on the ice. When in doubt, simply stay away from the ice, period.