Lake Mahinapua

Lake Mahinapua, located to the south of Hokitika, is a popular lake for all kinds of water recreation.

Lake Mahinapua is a shallow (less than 2.5 m deep) glacial lake located near the coast, halfway between Hokitika and Ross. Catchment landuse consists mostly of native forest and scrub, with a small amount of pasture land. The lake drains via Mahinapua Creek. The West Coast Regional Council monitors Lake Mahinapua for swimming suitability over the summer months. Click here for more information on the Lake Mahinapua Scenic Reserve.

Lake Summary

Lake size

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Maximum depth

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Catchment size

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Mixing pattern

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Geomorphic type

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Scientific data for this lake

This dashboard shows information on the data collected by the regional councils and unitary authorities for two indicators of lake water quality and ecological condition: TLI (Trophic Level Index) and LakeSPI (Lake Submerged Plant Indicators). Select an indicator to see the historical results.

Water Quality

Trophic Level Index (TLI)

The TLI score is an indicator of lake health and is determined from a suite of water quality measurements.

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Trophic Level Index (TLI) history for this lake

The TLI score for a lake is calculated from four water quality measurements – chlorophyll a, total nitrogen, total phosphorus and water clarity. If water clarity is unavailable, TLI is calculated using the other three water quality measurements. A higher score indicates poorer water quality.

View a factsheet on TLI

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TLI history for Lake Mahinapua

Year

What do the icons mean?

Very good water quality. Trophic Level Index of 0-2. Microtrophic lake conditions.

Good water quality. Trophic Level Index of 2-3. Oligotrophic lake conditions.

Average water quality. Trophic Level Index of 3-4. Mesotrophic lake conditions.

Poor water quality. Trophic Level Index of 4-5. Eutrophic lake conditions.

Very poor water quality. Trophic Level Index of greater than 5. Supertrophic lake conditions.

No data available.

TLI history for Lake Mahinapua data table

Year	TLI Score

Year	TLI Score

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Ecological Conditions

Lake Submerged Plant Indicators (LakeSPI)

The LakeSPI status describes the ecological condition of the lake and is based on plants present.

LakeSPI data provided by NIWA

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LakeSPI history for this lake

LakeSPI (Lake Submerged Plant Indicators) is a method of characterising the ecological condition of lakes based on the composition of native and invasive plants growing in them. A higher LakeSPI percentage result is associated with better ecological health:

LakeSPI	N/A
LakeSPI	{{spiData.details.Value}}%

The overall LakeSPI score is calculated using a Native Condition Index ('good' plants) and an Invasive Impact Index (introduced, non-native plants):

Native Condition	N/A
Native Condition	{{spiData.details.NativeIndex}}%

Invasive Impact	N/A
Invasive Impact	{{spiData.details.InvasiveIndex}}%	NA

A higher Native Condition value indicates better ecological condition, but a higher Invasive Impact value indicates invasive plants are negatively impacting native plant communities.
View a factsheet on LakeSPI for more information on these indicators.