The track up to Kirwans Hut from Boatmans Road end has bridges over all stream crossings so this track can be safely accessed in all but the most extreme weather conditions. However, the track down the Waitahu Valley from Montgomerie Hut crosses several fords, so take care if it has been raining heavily.
Wasps can be common from December to April, carry antihistamine if you are allergic to their stings.