Rivnuts from Munhall, PA on 3/14/2019 7:59:10 PM:
The National Park Service C&O Canal web site at:
https://www.nps.gov/choh/planyourvisit/conditions.htm
indicates the towpath is still closed there and the temporary bridge which had been planned at that location has not proceeded.
You may want to look at the detour described at:
https://www.youtube.com/watch?v=OhDNlqPGyuk
Perhaps there is some more current local knowledge that someone can provide