The Whau River is an estuarial arm of the southwestern Waitemata Harbour within the Aucklandmetropolitan area in New Zealand. It flows north for from its origin at the confluence of the Avondale Stream and Whau Stream to its mouth between the Te Atatū peninsula and the long, thin Rosebank Peninsula in Avondale. It is at its widest and wide at its mouth. The estuary extends past the suburbs of Glendene and Kelston, between Auckland City to the east and Waitakere City to the west. It has one small estuarial tributary arm, the Wairau Creek in the southwest. The tide flows up the Wairau Creek as far as Sabulite Road in Kelston, and up the Rewarewa Creek to Clark Street and Wolverton Road in New Lynn. The area at the mouth of the estuary is legally protected as the Motu Manawa Marine Reserve. The Whau River is named after a native tree, the whau.
History
In earlier times, Maori used the Whau for travel between the Waitemata Harbour and the Manukau Harbour. They paddled canoes up the Whau River and the Avondale Stream and then carried the canoes over a short stretch of land to Green Bay on the Manukau. This is remembered in the name for Portage Road, which runs alongside the Avondale Stream, and it is known that seasonal Maori settlements existed at the mouth of the river. For many years after European settlement, there was talk of making a canal between the Whau and the Manukau. Plans for a long canal, with a cutting up to deep, were made in 1907, but dismissed as too costly in 1921. European settlers used the Whau for marine transport and by 1865 there were five public wharves at New Lynn. Boats carried the products of local industries including brickworks, a leather tannery, a gelatine and glue factory and firewood cutting. The last commercial vessel to use the Whau was a flat-bottomed scow the Rahiri, which carried bricks and manuka firewood from the area until 1948. For nearly a hundred years, factories such as the tannery and an abattoir discharged wastes directly into the Whau. Friends of the Whau Inc. was formed in 1999 to restore the ecology of the Whau through revegetation and reduction of pollution. The Whau River Catchment Trust was formed in 2012. The West End Rowing Club has been based on the Whau since 2001. In 2015 construction began on the Te Whau Pathway, a walking and cycling path along the western edge of the Whau River from Te Atatū Peninsula to Olympic Park in New Lynn. The path is planned to continue on to Green Bay beach thus connecting the Waitemata Harbour to the Manukau Harbour.
Geography
The geology of the area is mainly composed of marine and riverine sediment. The stream's intertidal banks are commonly settled by mangroves and exotic weed species. The river's catchment covers and includes all or part of Te Atatū South, Glendene, Kelston, Titirangi, Titirangi North, Green Bay, New Lynn, Glen Eden, Avondale, Blockhouse Bay and Mount Albert. Watersheds closely follow Te Atatu Road, Titirangi Road, Hillsborough Road, Richardson Road and Rosebank Road. The catchment consists of clay, sandstone and mud and was formed 20 million years ago when the land was raised from the sea.
