Mahurangi River

The Mahurangi River is a tidal estuary in northern New Zealand that widens into the Mahurangi Harbour before opening into the outer Hauraki Gulf. The Mahurangi Harbour is accessible by all craft and is a sheltered anchorage in all weathers with many small bays and islands. The river itself is extremely tidal and ranges in depth from below approximately 50cm (MLW) at the channel entrance to approximately 150cm (MLW) further upstream. At high water the river is accessible by larger craft.In the past, the river was the main link between the town of Warkworth and the rest of civilisation. The historic Portland Cement Works opened in 1884 beside the river and many scows and steamers used it to export the cement. The cement works was closed down some years ago and the ruins remain on the banks of the river behind what has become a marina.Warkworth was originally known as Brown's Mill, after the sawmill established by Brown on the banks of the Mahurangi, when the area was just a timber camp. The timber was transported by the river and often consisted of kauri spars, which were commonly exported. Sandstone from NSW was used as ballast and this was dropped at the mouth of the river, where large quantities can still be found. The kauri spars were then loaded for the return trip to Australia. Nationally endangered Southern Right Whales are known to come into the bay to rest or calve.There are two boat yards on the Mahurangi river, the one by the ruins and one further upstream by Warkworth. These yards both offer haulout and hardstand options for both small and large craft. The township of Warkworth at the rivers head has a collection of small cafes, supermarkets, other stores and a post office. There is a moderately large wharf with a floating pontoon by the waters edge, although the river all but dries out here at low tide. The river itself has many small tributary streams which enter at different points along its length.