9. Lake Quality

DATED: 03 Apr 2008

Version: 2007 State of the Environment Report

9.9 Appendix A: Lake data

Table 2: Water quality and ecological data for the 31 lakes in the Lake Water Quality Monitoring Network and Lake Omapere including upper NRC sampling site, site location (New Zealand Transverse Mercator) trophic level index (TLI) score, trophic status, LakeSPI percentage score and ecological condition ranking.

Aupouri Site Easting Northing TLI Status LakeSPI% Cond ranking
Carrot 107776 1617103 6124469 4.87 Eutrophic 60 High
Heather 101031 1617689 6121305 3.66 Mesotrophic 22 High
Morehurehu 101908 1599734 6166636 3.7 Mesotrophic 51 Outstanding
Ngakapua (North) 108242 1617483 6124853 3.93 Mesotrophic 49 Moderate-High
Ngakapua (South) 101913 1617570 6124668 4.13 Eutrophic 46 Moderate-High
Ngakeketa North 108620 1577785 6180516 4.39 Eutrophic 66 High
Ngatu 101032 1618124 6122985 3.82 Mesotrophic 65 Outstanding
Rotokawau 106734 1618821 6124849 4.14 Eutrophic 56 Moderate-High
Rotoroa 100425 1617883 6120400 3.87 Mesotrophic 25 High
Te Kahika 101909 1600106 6168707 2.77 Oligotrophic NA Outstanding
Te Paki 108230 1581037 6178905 3.73 Mesotrophic 97 Outstanding
Wahakari 100410 1593521 6165291 3.97 Mesotrophic 80 Outstanding
Waihopo 108232 1603957 6154018 4.04 Eutrophic 54 Outstanding
Waipara 108240 1586635 6172824 3.28 Mesotrophic NA Moderate
Waiparera 101033 1616351 6133188 4.47 Eutrophic 48 Moderate-High
West Coast Road 108707 1616741 6123403 5.95 Supertrophic NA High
Central & Karikari Site Easting Northing TLI Status LakeSPI% Cond ranking
Omapere 106461 1673276 6088407 6.37 Hypertrophic NA Low
Waiporohita 101930 1631763 6137937 5.62 Supertrophic 93 Outstanding
Kai iwi Site Easting Northing TLI Status LakeSPI% Cond ranking
Kai-iwi 100438 1659037 6036328 3.19 Mesotrophic 83 Outstanding
Taharoa 100442 1658316 6037090 2.36 Oligotrophic 82 Outstanding
Waikere 100448 1656853 6038145 2.97 Oligotrophic 79 Outstanding
Pouto Site Easting Northing TLI Status LakeSPI% Cond ranking
Humuhumu 101379 1701253 5978969 3.66 Mesotrophic 81 Outstanding
Kahuparere 101367 1703965 5974380 4.23 Eutrophic 88 High
Kapoai 108634 1675020 6010692 6.09 Hypertrophic NA Low-Moderate
Kanono 101369 1702592 5975202 4.02 Eutrophic 76 Outstanding
Karaka 108347 1693273 5980792 4.73 Eutrophic 83 High
Mokeno 100593 1695144 5976511 3.96 Mesotrophic 83 Outstanding
Rotokawau 101373 1702973 5976737 3.31 Mesotrophic 41 High
Rototuna 101375 1693437 5987648 4.41 Eutrophic 76 High
Wainui 108346 1679349 6004457 4.9 Eutrophic 80 Moderate-High
Wairere 108641 1691585 5984453 5.4 Supertrophic NA Moderate-High
Whakaneke 108643 1695160 5974605 5.78 Supertrophic NA High

Table 3: Water quality and ecological data for all other lakes in Northland monitored in the last five years including upper NRC sampling site, site location (NZTM), estimated trophic level index (TLI) score, trophic status, LakeSPI percentage score and ecological condition ranking.

Aupouri Site Easting Northing TLI Status LakeSPI% Cond ranking
Austria NA 1584726 6174708 NA NA 46 Moderate
Bulrush 101910 1599692 6159296 NA NA NA Low
Forest HQ 101912 1617426 6125182 4.8 Eutrophic NA Low
Little gem by Ngatu NA 1617747 6122596 NA NA 57 Outstanding
Half Mile Lagoon NA 1617390 6118790 NA NA NA Low
Katavich NA 1614995 6133225 NA NA NA Low
Kihona 101907 1590973 6168112 4.55 Eutrophic 16 Low
Mini 105083 1617346 6118386 NA NA NA Low
Morehurehu South NA 1600485 6165737 NA NA 57 Moderate-High
Ngakeketa South 100996 1579030 6180278 4.44 Eutrophic 17 Low
Ngatuwhetu 108231 1589438 6173746 4.1 Eutrophic 41 Low
Pretty 108241 1584432 6173153 3.46 Mesotrophic 95 Moderate
Salt 101911 1602278 6159460 5.4 Supertrophic NA Low
Te Arai wetland/pond NA 1598022 6159812 NA NA NA Moderate
Te Arai Lake NA 1597154 6159761 NA NA NA Low
Te Werahi Lagoon NA 1573420 6184962 NA NA 37 Low
Waimimiha North 101914 1615468 6110685 6.8 Hypertrophic NA Low
Waimimiha South NA 1615561 6110795 NA NA NA Low
Waitahora Lagoon NA 1582837 6187464 NA NA NA Outstanding
Waitahora lakes NA 1583187 6187509 NA NA NA Outstanding
Karikari Site Easting Northing TLI Status LakeSPI% Cond ranking
Rotokawau East 100435 1629275 6141208 6.9 Hypertrophic NA Moderate
Rotokawau West 100432 1627975 6141304 6.52 Hypertrophic NA Moderate
Rotopokaka (Cola) 105413 1635006 6132588 4.82 Eutrophic NA Moderate
Central & Southern Site Easting Northing TLI Status LakeSPI% Cond ranking
Jacks 108243 1684545 6083544 4.73 Eutrophic 50 Low
Mangawhai NA 1742178 6004872 4.06 Eutrophic NA NA
Manuwai 101985 1678437 6107774 3.31 Mesotrophic NA Low
Ora NA 1716200 6049022 NA NA NA Low
Owhareiti 101989 1685502 6083555 4.97 Eutrophic 16 Low
Ruakaka 108786 1731493 6027263 6.49 Hypertrophic NA NA
Waingaro 101981 1679774 6097659 2.13 Oligotrophic NA Low
Waro 108784 1716828 6061273 2.69 Oligotrophic 50 Moderate-High
Kai iwi Site Easting Northing TLI Status LakeSPI% Cond ranking
Freidrichs NA 1668632 6022433 NA NA 57 Low
McEnvoy NA 1666781 6023612 NA NA NA Low
Midgeley 108348 1664170 6028099 4.47 Eutrophic 66 Moderate-High
Shag 100442 1658316 6037090 NA NA NA Low
Te Riu 100448 1656853 6038145 2.03 Oligotrophic 96 High
Waingata - Waipoua 108967 1642989 6053766 2.13 Oligotrophic 80 High
Pouto Site Easting Northing TLI Status LakeSPI% Cond ranking
Grevilles Lagoon NA 1674139 6011706 NA NA NA Moderate
Parawanui 101416 1676596 6008803 6 Hypertrophic NA Low
Phoebes NA 1696918 5981917 NA NA NA Low
Roto-otuauru (Swan) 101377 1702363 5978672 3.9 Mesotrophic 21 Moderate
Waingata - Pouto 101371 1703387 5976524 5.02 Supertrophic NA Low
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