A farmer who lives on the banks of Tasman's Wai-iti River is counting the cost of four floods in three years, with torrents washing away feed, scouring paddocks and flattening fences.

Jolene Rushbrooke and her partner were cut off by road after the approach to their bridge crossing the river was also washed out in heavy rain over King's Birthday weekend.

Instead of going to work, Rushbrooke was surveying the "devastating" mess left behind.

The mess after heavy rainfall in the Tasman.

"We're pretty close-knit up here, we've got good friends and neighbours. It's really heartbreaking that this just happens all the time," she said.