Mr Weston said the families living past the slip had been contacted.
"Some have decided to stay where they are and use the foot access in or out, and are making arrangements with family and friends for getting groceries in and out
"Others may decide to stay with friends and family," he said.
Mr Weston said council are trying to organise a parking area close to the slip where residents could park their cars and then walk to their properties.
Property owners had been asked to call WDC's call centre if they needed any information or assistance.
Whangarei and the Mid North received the bulk of rain with more than 100mm falling in some places in just 24 hours.
Rainfall figures from the Northland Regional Council show the heaviest fall of 153mm between 12pm yesterday and 12pm today was at Touwai, Whangaroa Harbour.
Ngunguru at Dugmores Creek received 121mm, Kaeo at Bramleys 125mm, Oakura Bay at Te Kapua St 114.5mm, Kerikeri at the Bay of Islands Golf Club 114mm, Oruru at the bowling club 109mm, Glenbervie Forest 97.5mm, and Marsden Point oil refinery 79.5mm.
Whakapara received 82.5mm, Te Puhi at Mangakawakawa (upper Awanui River north east of Mangamuka Hills) 88mm and Waitangi 85.8mm.
Areas on the west coast received 10mm or less.
Only 7mm was recorded on Wallace Rd in Awaroa, 9mm on Kai Iwi Lakes Rd, and 10mm on Pouto Pt.