The collapse is about 18km from the Coronet Peak Rd turn-off.
The Hohnecks are one of two families on the "wrong" side of the slip - Georgina and James Murray live on and run nearby Branches station, a sheep and cattle farm.
Mrs Hohneck said while it was impossible to get any vehicle over the road, there was still half a metre on which to walk past the slip, and she was lucky enough to have a vehicle parked on the other side of the break.
"I'll just have to walk now."
The slip had plunged at least 80 per cent of a 5-metre section of the Queenstown Lakes District Council-owned road into the river below, potentially disrupting access to the canyon for four other tourist operators: Kiwi Discovery, Nomad Safaris, Heritage Tours, and Off-road Adventures.
Council transport manager Denis Mander said the slip was most likely caused by rain and snow during the past two days.