The ice roads are open based on temperatures. For simplicity I used dates that are within the historical time lines. Basically without doing any edits there will likely be a couple weeks when the ice road is open but Waze thinks it is closed.
The information is found on the DOT website here: http://www.dot.gov.nt.ca/_live/pages/wp ... sonly.aspx
There are 18 DOT maintained ice roads, not to mention the ones that are made by private companies and individuals.