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The Onerahi Causeway is a causeway in the Northland Region of New Zealand. It links the suburb of Onerahi with the city of Whangarei and is approximately 5 km long. The causeway is built across the marshes and seabed of the upper Whangarei Harbour. It carries approximately 20,000 vehicles a day on Riverside Drive and is one of the regions busiest roads.〔http://www.wdc.govt.nz/TRAFFICANDTRANSPORT/ROADINGNETWORK/Pages/default.aspx〕 ==History== The Onerahi causeway was built between 1950 and 1953 by the Whangarei County due to a better link being needed between Whangarei and the areas of Onerahi, Parua Bay, Whangarei Heads and Whangarei Airport. The road that was existing at the time followed the northern shores of the Whangarei Harbour, with a series of small one lane bridges crossing the streams that entered the harbour, such as the Awaroa River, and Mackesy Stream. The old piles are still present today. The construction involved draining areas of the harbour, such as the area inland of Kissing Point, and building up the road surface to avoid flooding during Spring Tides. This resulted in the new road being straight, very flat and requiring 3 bridges to be built. The construction of the causeway also included the laying of council infrastructure, such as sewerage and water supplies to Onerahi, and the eventual closure of the waste treatment works at Onerahi. The completed works greatly improved travel to Onerahi, which was neglected when the Onerahi Branch Railway was closed in 1933. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Onerahi Causeway」の詳細全文を読む スポンサード リンク
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