Welcome to the site twinmama
I've never been to those camp sites, but i went through Eidsvold at christmas, they had some massive floods through there so you'll be guaranteed of some flowing creeks ! I think anything on creek banks would have been wiped out !
If i wasn't sure about the site, i'd just turn up and have a look without booking, I'd bet ($5) they would be quiet anyway, and unlikey they will turn you away. More than likely they'd lock a gate behind you so you couldn't get out!
I think Kroombt Tops is pretty popular. I was going t drop in there at Christmas but the roads were flooded.
Sorry i can't help more than that, but that's what i do here, just reply with useless info, it's Sunday arvo beers