Lake Rotoehu at Otautu Bay

Managed by Swim Guide NZ

Otautu is one of two access points on Lake Rotoehu. The area is used for swimming, fishing and boating and has a small public boat ramp.

Otautu was chosen as a trial site for a Parklink remedial treatment program because it is shallow, easily accessible and enclosed. The lake often has blue green algae / Cyano-bacteria blooms due to the excessive nutrients leached into the lake. The treatment was successful and showed that removing hornwort (an invasive plant) and creating a "floating wetland" helped to reduce algae blooms. Canvases are turned into buoyant mats, covered in native wetland species. The roots of the plants provide the growth of beneficial micro-organisms that enhance nitrogen removal. They also inhibit algae growth through providing shade and reducing wave erosion of lake banks. Conservationists were consulted to ensure that environmental harm would not result from the creation of the wetlands before they were made. It turns out that the wetland provides additional habitat for fish and birds.

Lake Rotoehu one of the smallest in the Okataina caldera measuring 795 hectares, and is quite shallow reaching a maximum depth of 13.5 meters. Rotoehu is M?ori for "murky water", likely due to the geothermal inputs and shallow lake bed.

COVID-19

Keep your distance from other people.

Practicing social distancing is essential right now. Follow the advice of the health experts. If your community has asked that you remain indoors and away from others, do so. Heading to the beach should only be considered an option if social distancing practices can be followed. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter the efforts to curb the virus’ spread.

For more information, please visit the World Health Organization public resource on COVID-19.

Water Quality
  • Special health or safety status in effect

  • Special Status
  • This means the affiliate organization managing a beach has set the beach status based on special local knowledge or information. Check the beach description and the Sources section for details.
For water quality icon legend, click:  
Monitoring Frequency

Lake Rotoehu at Otautu Bay is sampled weekly from October 31st to March 31st.

Source Information

Bay of Plenty monitors water quality at popular swimming spots throughout the Bay of Plenty.

Water quality data on Swim Guide is sourced from the LAWA Can I Swim Here? website. www.lawa.org.nz/swim

At this site, water is regularly tested for levels of E. coli and potentially toxic algae during the summer months. E. coli is a faecal indicator bacteria is used to indicate the level of harmful pathogens in the water, and the presence of toxic algae blooms can be harmful to people and animals.

See information on recreational water quality monitoring in New Zealand in the LAWA factsheet: https://www.lawa.org.nz/learn/factsheets/coastal-and-freshwater-recreation-monitoring/

Beach sites are shown as a GREEN swim icon if the latest E. coli test result was in the range of 0 - 550 E. coli / 100 mL or the potentially toxic cyanobacteria biovolume or total cyanobacterial material is less than 0.5 mm3/L.

Beach sites are shown as a RED swim icon if the latest E. coli test result exceeded 550 E. coli / 100 mL or the total microcystins exceed 12 ug/L or potentially toxic biovolume exceeds 1.8mm3/L or the potentially toxic cyanobacteria biovolume or total cyanobacterial material is equal to or more than 0.5 mm3/L.

A RED swim icon status is also assigned if this site frequently exceeds the standards or there is a temporary water quality issue outside the routine testing programme (e.g. sewage overflow).

See information on the standards for recreational water quality monitoring in New Zealand in the 'What do the swim icons mean?' LAWA factsheet.

LAWA recommends for all sites, to avoid swimming for 2 - 3 days after significant rain, even for sites that normally have good water quality.

A good rule of thumb is to check that you can see your toes in knee deep water.

Toxic algae blooms can form rapidly, and even small amounts can be harmful - stay safe and get to know what to look for here so you can avoid it: https://www.lawa.org.nz/learn/factsheets/potentially-toxic-algae/

See www.lawa.org.nz/swim for up to date information on current warnings and alerts, weather conditions, real-time water temperature and water levels, what facilities are available, the monitoring history at this site and helpful factsheets.

Water Quality Graph

Lake Rotoehu at Otautu Bay

Managed by Swim Guide NZ

COVID-19

Keep your distance from other people.

Practicing social distancing is essential right now. Follow the advice of the health experts. If your community has asked that you remain indoors and away from others, do so. Heading to the beach should only be considered an option if social distancing practices can be followed. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter the efforts to curb the virus’ spread.

For more information, please visit the World Health Organization public resource on COVID-19.

Water Quality
  • Special health or safety status in effect
  • Special Status
  • This means the affiliate organization managing a beach has set the beach status based on special local knowledge or information. Check the beach description and the Sources section for details.
For water quality icon legend, click:  

Otautu is one of two access points on Lake Rotoehu. The area is used for swimming, fishing and boating and has a small public boat ramp.

Otautu was chosen as a trial site for a Parklink remedial treatment program because it is shallow, easily accessible and enclosed. The lake often has blue green algae / Cyano-bacteria blooms due to the excessive nutrients leached into the lake. The treatment was successful and showed that removing hornwort (an invasive plant) and creating a "floating wetland" helped to reduce algae blooms. Canvases are turned into buoyant mats, covered in native wetland species. The roots of the plants provide the growth of beneficial micro-organisms that enhance nitrogen removal. They also inhibit algae growth through providing shade and reducing wave erosion of lake banks. Conservationists were consulted to ensure that environmental harm would not result from the creation of the wetlands before they were made. It turns out that the wetland provides additional habitat for fish and birds.

Lake Rotoehu one of the smallest in the Okataina caldera measuring 795 hectares, and is quite shallow reaching a maximum depth of 13.5 meters. Rotoehu is M?ori for "murky water", likely due to the geothermal inputs and shallow lake bed.

Monitoring Frequency

Lake Rotoehu at Otautu Bay is sampled weekly from October 31st to March 31st.

Source Information

Bay of Plenty monitors water quality at popular swimming spots throughout the Bay of Plenty.

Water quality data on Swim Guide is sourced from the LAWA Can I Swim Here? website. www.lawa.org.nz/swim

At this site, water is regularly tested for levels of E. coli and potentially toxic algae during the summer months. E. coli is a faecal indicator bacteria is used to indicate the level of harmful pathogens in the water, and the presence of toxic algae blooms can be harmful to people and animals.

See information on recreational water quality monitoring in New Zealand in the LAWA factsheet: https://www.lawa.org.nz/learn/factsheets/coastal-and-freshwater-recreation-monitoring/

Beach sites are shown as a GREEN swim icon if the latest E. coli test result was in the range of 0 - 550 E. coli / 100 mL or the potentially toxic cyanobacteria biovolume or total cyanobacterial material is less than 0.5 mm3/L.

Beach sites are shown as a RED swim icon if the latest E. coli test result exceeded 550 E. coli / 100 mL or the total microcystins exceed 12 ug/L or potentially toxic biovolume exceeds 1.8mm3/L or the potentially toxic cyanobacteria biovolume or total cyanobacterial material is equal to or more than 0.5 mm3/L.

A RED swim icon status is also assigned if this site frequently exceeds the standards or there is a temporary water quality issue outside the routine testing programme (e.g. sewage overflow).

See information on the standards for recreational water quality monitoring in New Zealand in the 'What do the swim icons mean?' LAWA factsheet.

LAWA recommends for all sites, to avoid swimming for 2 - 3 days after significant rain, even for sites that normally have good water quality.

A good rule of thumb is to check that you can see your toes in knee deep water.

Toxic algae blooms can form rapidly, and even small amounts can be harmful - stay safe and get to know what to look for here so you can avoid it: https://www.lawa.org.nz/learn/factsheets/potentially-toxic-algae/

See www.lawa.org.nz/swim for up to date information on current warnings and alerts, weather conditions, real-time water temperature and water levels, what facilities are available, the monitoring history at this site and helpful factsheets.

Water Quality Graph

  Beach Location Water Quality
Rotoma, Bay of Plenty
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Rotoma, Bay of Plenty
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