The Bell Rd boat ramp remains open for people to launch on to the Kaituna River.
De Monchy said changes to flows through Ford's Cut would make it less suitable for whitebait during the construction period, so fish numbers will be low there anyway.
"The re-diversion project will improve fish habitat and the health of Te Awa o Ngatoroirangi Maketū Estuary in the long term. In the short term, whitebaiters will need to try some new fishing spots nearby.
"The lower ends of the Kaikokopu, Pongakawa and Wharere Streams can all be accessed via public roads, as can the Maketū and Waihī Estuary entrances. If people are prepared to walk, they can also get to the Kaituna River through the Lower Kaituna Wildlife Management Reserve on Pah Rd."
De Monchy said that the partial restoration of freshwater flows from the Kaituna River into Maketū Estuary was just one of the many projects under way that would benefit whitebaiters over time.
"Whitebait species spend most of their lives in freshwater rivers and streams. We're working with landowners to identify and reduce run-off sources, restore wetlands, plant stream margins, and take other steps to restore water quality and fish habitat that has been degraded through historic land use change.
"In the past year we've delivered 22 riparian improvement projects in the Kaituna Pongakawa catchments; protecting 33km of waterways in partnership with landowners. Those projects have included work to improve the spawning and rearing habitat of inanga which is the main species in whitebait catches here."
See details about the Kaituna River re-diversion project at www.boprc.govt.nz/kaitunarediversion and further information about the council's work to care for land, water and wildlife in the Kaituna Catchments at www.boprc.govt.nz/kaitunamaketu