HELP - I've googled this with little success, links to pages that are just not giving the information i want!

Where can I find a list of road closures, or basically check to see if State hughway one, around Ruahepu is open or not, we are driving up to Auckland on Friday lunchtime, and i want to be able check its open before we set off, otherwise we will have to do some major detours!

Any links folks?