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Lake Benmore is a large man-made lake used for as a reservoir for hydro electric generation and recreation. The lake has two arms - the Haldon arm which is fed primarily by the Tekapo, Pukaki and Twizel rivers, and the Ohau Canal; and the Ahuriri Arm which is fed primarily by the Ahuriri River. Rout...

The Ahuriri Arm of Lake Benmore is fed primarily by the Ahuriri River and tributaries. This lake is monitored for water quality during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available data can still be accessed for each parame...

Lake Coleridge / Whakamatau is a large high country lake located in the upper Rakaia River catchment. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available...

Dudding Lake is a deep coastal dune lake located within the Rangitīkei River Catchment and is popular for swimming, boating and fishing. In 2014, Horizons Regional Council commenced water quality monitoring by boat on a quarterly basis (monthly since 2019). In 2001 and 2015, NIWA assessed the ecolog...

Lake Emily is a small high country lake located in the upper Ashburton River catchment. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available data can still...

Lake Georgina is a small high country lake located near Lake Coleridge and the upper Rakaia River. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available dat...

Lake Grasmere / Ōpōreaiti is a high country lake located in the Waimakairi River catchment, near the West Coast Rd. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But...

Lake Hawdon is a small high country lake located in the Waimakariri River catchment. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available data can still be...

Lake Hāwea covers an area of 141 km², has a maximum depth of 392 metres, and is 35 km long and 8 m across, at its widest point. It has excellent water quality and is classified as oligotrophic. The main rivers flowing into Lake Hāwea and much of the catchment sits within the Hāwea Conservation Area....

Lake Heaton is a shallow coastal dune lake located within the Rangitīkei River Catchment. In 2014, Horizons Regional Council commenced quarterly water quality monitoring of the lake by helicopter. In 2017, NIWA assessed the ecological condition of the lake using Submerged Plant Indicators (LakeSPI)...

Lake Herbert is a shallow coastal dune lake located within the Rangitīkei River Catchment. In 2015, Horizons Regional Council commenced quarterly water quality monitoring of the lake by helicopter. In 2017, NIWA assessed the ecological condition of the lake using Submerged Plant Indicators (LakeSPI)...

Lake Ida is a small high country lake located in the upper Rakaia River catchment. This lake is monitored for water quality in the centre of the lake, during the summer months. State and trends may not be displayed on this page due to limited sampling frequency. But the available data can still be a...