Parks has updated the closure on the Bolte Hwy, albeit with bureaucrat speak ("further rain damage has accrued on the road" - I think they meant to say "occurred", otherwise it's just a book entry) :
Further to this morning’s part closure of Mt Zero Road, Parks Victoria crews have assessed the northern end of Mt Zero and further rain damage has accrued on the road making the road impassable in sections.
Please see the following closures for Mt Zero Road:
• Flat Rock intersection to Roses Gap Road
• Roses Gap Road to Heatherlie Quarry
This closure will be in place until the area dries out and machinery and crews can enter the area to repair the damage.