According to news report from last October, the tornado resulted in a section of the trail (near Mountain Lake and Clearwater portage) becoming impassable. I have not seen info yet whether any winter time work was done to clean it up and my guess is...not likely. It looks like a big cleanup effort will be needed.
This is a video posted from last fall traveling west on the BRT from the Clearwater-Mountain portage.
BRT tornado damage