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The Urenui Estuary is a moderate length, shallow and short resident time tidal river estuary. Urenui estuary is predominantly intertidal (over two-thirds of its total area), including a large mudflat known as Snapper Flat next to the township. This estuary is included in the Council’s Key Native Ecosystem programme in recognition of the area’s high ecological value. With a large number of pā sites located along its banks, this estuary is of significance to Ngāti Mutunga. The upstream catchment is largely made up of mixed native forest (66%) as well as sheep and beef (22%) and dairy farmland (9%).

The estuary is vulnerable to the impacts of sedimentation due to the catchment being erosion prone and the high proportion of muddy sediments in the mid-upper reaches of the estuary. Recently, it was discovered that septic tank waste was contaminating the town’s stormwater which discharges into the estuary.


Estuary summary

What makes my estuary unique?

Explore the characteristics of this estuary


Estuary characteristics

  • Significant features
    • TRC Key Native Ecosystem
    • Introduced mangroves in this estuary are the southernmost surviving mangrove plants recorded in NZ
  • Total area
    21 hectares
  • Total shoreline length
    6 km
  • Key rivers
    • Urenui River

What's happening upstream?

See results from monitored river quality sites influencing this estuary

River quality

What's happening upstream?

The physical characteristics and health of estuaries are influenced by the rivers and streams flowing into them. For instance, when it rains the mud and contaminants generated on land can be washed into rivers and eventually flow into the estuary. The health of our rivers and streams can therefore be very important for Estuary Health, and understanding the upstream pressures can help with interpreting estuary monitoring data.

Monitoring is undertaken for a range of river health indicators (e.g., water quality and ecology) in many catchments across the region. Where there are monitored river catchments that influence this estuary, these are shown below. You can click through to view monitoring results from these River Quality sites to see current state and how health has changed over time.

What surrounds my estuary?

See land cover information from monitored catchments that surround this estuary

Land cover

What surrounds my estuary?

The physical characteristics and health of estuaries are influenced by local geography and the way we use our land. This is because estuaries are the receiving environments for many of our land use activities. Land cover information can be used as an indicator of land use, therefore knowing the surrounding land cover can help us understand which pressures might be affecting Estuary Health.

Where there is land cover information available for nearby catchments, these are listed below. These figures show the types of vegetation and built or natural features that surround the estuary margins and the rivers that flow into this estuary. You can click through to the Land Cover topic to see these land cover classes broken down into further detail, and view changes over time.

Urenui River

What do the Broad Land Cover Classes mean?

Land cover information on LAWA is grouped into land cover classes at two levels of detail – broad and medium. For this overview we are showing the six broad-level classes for the catchment.

  • Forest

    Inclusive of; indigenous and exotic forest.

  • Scrub / shrubland

    Inclusive of; indigenous and exotic scrub / shrubland.

  • Grassland / other herbaceous vegetation

    Inclusive of; tussock and exotic grassland and other herbaceous vegetation.

  • Cropland

    Inclusive of; cropping / horticulture.

  • Urban / bare / lightly-vegetated surfaces

    Inclusive of; natural bare/lightly-vegetated and artificial bare surfaces, and urban area

  • Water bodies
Monitored sites 1

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