The stream begins in the Waitākere Ranges near the junction of Piha Road and Anawhata Road. It flows westwards towards the Tasman Sea, joined by a number of tributaries: Centennial Stream, McKenzie Stream, Maungaroa Stream, Glen Esk Stream, Slipper Gully and Ingram Stream.[1] The upper section of the Piha Stream features a small canyon,[2] and an estuary is found at the mouth of the stream.[3]
The stream is in the rohe of Te Kawerau ā Maki, and was given the name Waiokahu by the ancestor Rakataura of the Tainui migratory canoe,[6] who named it "The Waters of Kahu" after his wife Kahukeke, who found the Piha Valley area beautiful.[7] The stream was used as a place by Tāmaki Māori to catch piharau (lampreys) as they ascended from the ocean.[1]
The Black Rock Dam was built around the year 1910 on the Piha Stream, as a driving dam for kauri logging.[8]
In 2008, a new footbridge was constructed across the Piha Stream. Designed by local artist Mandy Patmore, the bridge depicts the lifecycle of the New Zealand longfin eel.[9][10]
Recreation
The Piha canyon is a place where abseiling can be done.[2]
^Taua, Te Warena (2009). "He Kohikohinga Kōrero mō Hikurangi". In Macdonald, Finlay; Kerr, Ruth (eds.). West: The History of Waitakere. Random House. pp. 40–41. ISBN9781869790080.