The Wainui River is a river of the Bay of Plenty Region of New Zealand's North Island. It flows north from the Kaimai Range to reach Tauranga Harbour south of Katikati. The catchment has of stream margins. 41% of the catchment remains covered in native bush, but 48% is under pasture and suffers soil erosion.

The river includes 3 waterfalls of up to , which have been kayaked.

The long former East Coast Main Trunk railway bridge is designated as the limit of the Coastal Marine Area. Downstream, a 3-span bridge takes SH2 over the river.

The river is also bridged by the current East Coast Main Trunk railway. Bridge 45 was built between 1969 and 1973 and opened with the Kaimai Tunnel on 12 September 1978. It is long and above the river.

See also List of rivers of New Zealand

References

External links Photo of train on Wainui viaduct