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Tokomairiro River

The Tokomairiro River, which has west and east branches, flows into the Pacific Ocean at Toko Mouth approximately 50 km south of Dunedin. It has a total catchment area of 398 square kilometres.

The average annual rainfall at Milton is 740 mm. The Tokomairiro Catchment has a long history of agricultural land use, in recent years (since the late 1990s) there as been a shift from sheep and beef farming to intensive dairy farming, especially on the Milton (Tokomairiro) Plain.

The mid and lower reaches of the Tokomairiro River are different from many other South Island east coast rivers because of their meandering pattern. Approximately 9km downstream of Milton, the river forms a wetland (Tokomairiro River swamp) and then flows out to sea at Toko Mouth.

The main recreational uses in the Tokomairiro River catchment are waterfowl shooting and angling. Anglers attracted to this resource tend to be local rather than from elsewhere in the Otago Region. Other recreational uses of Tokomairiro River itself include bird watching, swimming, picnicking, and boating in the estuary.Historical water quality monitoring of the Tokomairiro River has shown that water quality is degraded, particularly in its lower reaches.

Sites 1

Monitored sites in the Tokomairiro River catchment

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Scientific Indicators
Scientific data for this catchment

This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as state and trend.

The state for the catchment is represented by the median concentration for the parameter across all sites within the catchment and then compares that value to the quartiles for all monitored sites in New Zealand.

Click on the parameters state icons to compare this catchment with others in the region.

  • State

    State shows how the median of samples from this site compares to other sites

  • Trend

    Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:

Can I trust this data?

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected and the statistical analysis and interpretation of the results presented.

If all Cawthron ticks are green, then you can trust this data. However, if one or more ticks are orange, then conclusions should be treated with some caution.

For more details on each tick, see our 'Can I Trust This Data?' Factsheet.

Can I trust the data?
Data Collection

All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here has been collected and analysed following best practice.

State

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

Trend - Adjustment for flow

This data is not flow adjusted. National guidelines suggest that flow-sensitive variables are flow 'adjusted' before trend analysis. Therefore, any trends shown here may be affected by variations in flow across sampling occasions.

Bacteria

E. coli
State
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Trend
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Clarity

Clarity

Black disc
State
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Trend
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Clarity

Turbidity
State
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Trend
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Nitrogen

Nitrogen

Total Nitrogen
State
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Trend
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Nitrogen

Total Oxidised Nitrogen
State
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Trend
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Nitrogen

Ammoniacal Nitrogen
State
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Trend
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Phosphorus

Phosphorus

Dissolved Reactive Phosphorus
State
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Trend
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Phosphorus

Total Phosphorus
State
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Trend
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Download Data

.ZIP file of indicator readings for all sites in New Zealand
Download
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