The Këlauea Plantation or Këlauea Sugar Plantation was a large sugarcane plantation on the north side of Kauai island, Hawaii, including the community of Këlauea, Hawaii. It was owned and operated by the 1880-incorporated Këlauea Sugar Company, which became the Këlauea Sugar Plantation, Co. from 1899 on. The original property was bought by an American, Charles Titcomb, from Kamehameha IV by 1863 who used it for cattle ranching. It was sold to Englishmen John Ross and E.P. Adams, who also leased additional land from Titcomb. Ross and Adams planted sugarcane, then incorporated a firm. It was operated as a plantation from 1880 to 1971.
Several historic buildings of the plantation survive, and are listed on the U.S. National Register of Historic Places (NRHP). Among these are several stone buildings, of a local style that took advantage of fieldstone removed from sugarcane fields. Temporary railway tracks were laid down to transport the fieldstone from piles beside the fields to the building locations.
The Këlauea Plantation Manager's House, at 4591 Kuawa Rd. in Këlauea, was NRHP-listed in 1993; the listing includes three contributing buildings.
Also known at the William Akana Residence, the Këlauea Plantation Head Luna's House, at 2457 Kolo Rd. in Këlauea, also was NRHP-listed in 1993.
The Këlauea Plantation Head Bookkeeper's House, at 2421 Kolo Rd. in Këlauea, Hawaii, was built in 1930. Its NRHP listing, also in 1993, included two contributing buildings. The main house was the seventh stone house built by the plantation, and is "a good example of the bungalow/craftsman style in Hawaii".
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The school for the community was the Këlauea School, located on the edge of the plantation, at 2440 Kolo Rd., Këlauea, Hawaii. It was built in 1922 and is NRHP-listed, but is not built of stone. It was listed for its architecture and its association with the community.
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This was a grocery store for plantation workers, located on W. side of Lighthouse Rd., about .5 mi N. of HI 56., and is listed on the National Register. Built in c.1941, it was the last stone building built by the plantation.
The Këlauea Sugar Plantation Railway or Këlauea Track Line was the long narrow gauge railway network with a gauge of 2 ft (610 mm) for transporting sugarcane and sugar.