Mahurangi River
Encyclopedia
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 50 cm (MLW) at the channel entrance to approximately 150 cm (MLW) further up stream. At high water the river is accessible by larger craft.
In days gone by 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 have stood the test of time and remain on the banks of the river today, behind what is now a marina.
Warkworth was originally known as Brown's Mill, after the sawmill established by Mr 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.
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.
A series of waterfalls enhance the river in various places and the navigable portion of the Mahurangi river ends at the lower-most falls near western end of the Village. Here the river has been dammed twice and had several bridges installed since the first in the late 1860s. In 1877 a tidal wave elevated the tide here by six feet in mere minutes. There are currently two bridges at this point: a concrete bridge installed in 1971, on which originally operated a tram and which is now a walking bridge, and a more recent bridge with two lanes for traffic.
Estuary
An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea....
in northern New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...
that widens into the Mahurangi Harbour before opening into the outer Hauraki Gulf
Hauraki Gulf
The Hauraki Gulf is a coastal feature of the North Island of New Zealand. It has a total area of 4000 km², and lies between the Auckland Region, the Hauraki Plains, the Coromandel Peninsula and Great Barrier Island...
. 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 50 cm (MLW) at the channel entrance to approximately 150 cm (MLW) further up stream. At high water the river is accessible by larger craft.
In days gone by the river was the main link between the town of Warkworth
Warkworth, New Zealand
Warkworth is a town in the upper North Island of New Zealand, within the Rodney District and lying at the far north of the Auckland Region but just south of the Northland Region...
and the rest of civilisation. The historic Portland Cement
Portland cement
Portland cement is the most common type of cement in general use around the world because it is a basic ingredient of concrete, mortar, stucco and most non-specialty grout...
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 have stood the test of time and remain on the banks of the river today, behind what is now a marina.
Warkworth was originally known as Brown's Mill, after the sawmill established by Mr 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
Agathis australis
Agathis australis, commonly known as the kauri, is a coniferous tree found north of 38°S in the northern districts of New Zealand's North Island. It is the largest but not tallest species of tree in New Zealand, standing up to 50 m tall in the emergent layer above the forest's main canopy. The...
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.
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.
A series of waterfalls enhance the river in various places and the navigable portion of the Mahurangi river ends at the lower-most falls near western end of the Village. Here the river has been dammed twice and had several bridges installed since the first in the late 1860s. In 1877 a tidal wave elevated the tide here by six feet in mere minutes. There are currently two bridges at this point: a concrete bridge installed in 1971, on which originally operated a tram and which is now a walking bridge, and a more recent bridge with two lanes for traffic.