Talked to a native friend a few days ago. Brent road was not plowed so you can't access past Wendigo yet more than likely, bisset road was plowed right across the park however, he used it to go ice fishing in the catfish and traverse Areas

Well I will admit when I am wrong.  Really did not see them opening the same day as ice out.
The cynic in me says this has a LOT to do with the election this year.