The Waikato police boat and another vessel from the Waikato Regional Council were joined by the Eagle helicopter to scan the lake yesterday.
"We are following up on anything new we receive but still we need the support of the public to help us bring Kim home for the sake of her family," Patterson said.
Richmond left her home in a 2014 Ford Ranger utility with the number plate HKD553.
She headed south from her Wharepapa South farm, an "out of character move" according to police.
Police would like to hear from anyone who may have sighted someone throwing items out of a vehicle on State Highway 46 over the past few weeks.