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Mangemangeroa Creek is one of three shallow, drowned valley estuaries that flow into the Whitford embayment on Auckland’s southeast coast. Mangemangeroa features extensive areas of fringing mangroves which transition into prime examples of mature coastal taraire and kōwhai forest in places. This provides high quality habitat for several threatened coastal birds.

Monitoring was started in Mangemangeroa to track any effects of urban development around the estuary. The estuary catchment currently has a mixture of urban and rural land uses, and the results from the monitoring sites indicate that mud has moderate to high impacts on the health of the estuary.


Estuary summary

What makes my estuary unique?

Explore the characteristics of this estuary


Estuary characteristics

  • Significant features
    • Significant Ecological Areas identified within the estuary as defined in the Auckland Unitary Plan
    • Mangemangeroa Shelly Park Beach Path
    • Within the Hauraki Gulf Marine Park
  • Total area
    60 hectares
  • Total shoreline length
    ~8.4 km
  • Key rivers
    • Mangemangeroa Creek

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.

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Monitored sites 4

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