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The Okana River is a river on Banks Peninsula. It passes through Little River before entering the eastern end of Lake Forsyth/Wairewa.

The Waiau - Hurunui zone (WHZ) covers an area of 6095 km2 and is home to over 11,500 people. The upper reaches of the catchments are dominated by native vegetation and the middle and lower reaches, particularly the Culverden Basin are dominated by intensive landuse practices such as beef and sheep f...

The Okuti River is situated in the Okuti Valley, near Little River. This site is located in the lower reaches, before it flows into the eastern end of Lake Forsyth/Wairewa

The Omaka River arises in the Southern Valley hills of South Marlborough. This is one of the dryer areas of Marlborough where annual rainfall can be as little as 600mm. Greywacke is the dominant geology of the steep, rocky hills of the Southern Valleys.

Omanuka Lagoon 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 2016, NIWA assessed the ecological condition of the lake using Submerged Plant Indicators (LakeSP...

The Onekaka River, between Takaka and Collingwood, has a relatively high proportion of native forest in its catchment (approximately 40%). A hydro-electric power scheme operates on the river, using a 10.7 m high dam, built in 1928, which is located four kilometres upstream of Shambala Road. The Onek...

Located north west of Taumarunui, landuse in the catchment upstream of this site is predominantly rural. The Ōngarue River in the vicinity of this site is valued as a locally significant trout fishery.

The Opaoa River was known as the Opawa River until its name was officially changed in 2014.  The Opaoa  includes the Omaka and Taylor Rivers as major tributaries, as well as the rivers flowing through the  Benmorven, Brancott and Omaka aquifers.

The Oparau River at Langdon Rd is a water quality, flow and ecology site. The river is hard-bottomed with the substrate consisting of cobbles/gravel at the monitoring site. The river banks have some riparian cover in the vicinity of the monitoring site.

This site was monitored by NIWA up until 2022, and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989.   Click on an indicator below to see the monitoring results.   Please refer to "Opihi River at Grassy Banks" site for recent monitoring by Environment Can...

This site was monitored by NIWA up until 2022, and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989.   Click on an indicator below to see the monitoring results. Please refer to "Opihi River at Rockwood" site for recent monitoring by Environment Canterb...

This hill-fed lower site is typical of Canterbury plains hill-fed braided rivers with moderate flows and a gravel bed. Located near the township of Pleasant Point and the Stratheona hut community. This site is monitored for recreational water quality during the summer months  only.