I did not realize that the Walterdale was designed to have the west shared use path become a fourth vehicle lane if needed, which explains it's wide width. A new SUP could be constructed on the west exterior of the bridge to replace the lost SUP:
I wonder if that plan is being looked at to give the bridge more capacity when the various bridge renewals begin next year. If it becomes four lanes, they could do two in each direction and convert Walterdale Hill Road to northbound.