Anahulu River
The Anahulu River (also called Anahulu Stream) is the longest watercourse on the island of Oahu in the U.S. state of Hawaii. It is 7.1 miles (11.4 km) long.
It is formed on the western side of the northern Koolau Range approximately 7 miles (11 km) northeast of Wahiawā by the confluence of Kawainui and Kawaiiki streams, both perennial. It flows west-northwest descending through Kawailoa Gulch, then empties into the eastern end of Waialua Bay at Haleiwa. It has a watershed of approximately 16 square miles (41 km2) and a 100-year peak discharge of 16,200 ft3/s (459 m³/s).
Archaeological evidence indicates that the valley of the river near its mouth was the site of ancient Hawaiian villages. The river valley was abandoned but was later repopulated in the early 19th century, partly as the result of a policy by King Kamehameha I to grow food to support his military expeditions. The policy included the development of irrigated terraces. In 1832 U.S. Protestant missionaries John Emerson and his wife Ursula Sophia circumnavigated Oahu and put in at the mouth of the river, located at 21°35′40″N 158°6′15″W / 21.59444°N 158.10417°WCoordinates: 21°35′40″N 158°6′15″W / 21.59444°N 158.10417°W. At the village of Haleiwa (from hale (home) of the iwa (frigate bird)), they were welcomed by Chief Laanui and established the Liliuokalani Church in the village.
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