Thanks to Joel Arthurs for letting me know that Algonquin Park has begun posting spring snow & ice conditions on their web site, here.
Unfortunately, the news is pretty grim...
Ice Conditions: All lakes are ice-covered with only small ponds and fast-flowing creeks beginning to open up. We remind everyone to stay off the ice.
Access Roads: Access roads are snow-covered and impassable.
They are planning a flight over the Park to assess ice conditions some time closer to the end of the month, so stay tuned.