In the early-1900s, Lucius Pinkham, then President of the Territorial Board of Health and later Governor, developed the idea of constructing a drainage canal to drain the wetlands, which he considered “unsanitary.” This called for the construction of a canal to reclaim the marshland.
The Waikīkī Reclamation District was identified as the approximate 800-acres from King and McCully Streets to Kapahulu Street, near Campbell Avenue down to Kapiʻolani Park and Kalākaua Avenue on the makai side (1921-1928.) The dredge material not only filled in the makai Waikīkī wetlands, but it was also used to fill in the McKinley High School site.
During the 1920s, the Waikīkī landscape would be transformed when the construction of the Ala Wai Drainage Canal, begun in 1921 and completed in 1928, resulted in the draining and filling in of the remaining ponds and irrigated fields of Waikīkī.
By 1924, the dredging of the Ala Wai Canal and filling of the wetlands stopped the flows of the Pi‘inaio, ‘Āpuakēhau and Kuekaunahi streams running from the Makiki, Mānoa, and Pālolo valleys to and through Waikīkī.
With construction of the Ala Wai Canal, 625-acres of wetland were drained and filled and runoff was diverted away from Waikīkī beach. The completion of the Ala Wai Canal not only gave impetus to the development of Waikīkī as Hawai‘i’s primary visitor destination, but also expanded the district’s potential for residential use.
Then, in 1956, Hawaiian Electric installed cables across the Ala Wai Canal to provide Waikīkī with additional electric power capacity. (HECO)
As part of the installation process, “A ‘road’ nearly spanning the Ala Wai has appeared almost overnight, surprising thousands of passers-by who are accustomed to seeing the canal as an unbroken ribbon of water from Kapahulu to the sea.”
“But Hawaiian Electric Co. assured the public yesterday that the ‘road’ would stay there only as long as to bury a 44,000-volt cable needed to bring more electricity to an expanding Waikiki.”
“The ‘road’ will support cranes which will dig a trench 23 feet deep and four feet wide under the Ala Wai. Then the cable will be laid across the canal, down Kaiolu St. and ino the Waikiki sub station.”
“Erling V Schoenberg, Hawaiian Electric’s superintendent for the job, said the Ala Wai ‘road’ was the cheapest way of getting the digging equipment into the area.” (Advertiser, Sep 11, 1956)
“Clam shell cranes will begin digging a ditch in the floor of the Ala Wai from a causeway today or tomorrow, according to Erling V Schoenberg, Hawaiian Electric Company underground superintendent.”
“The dirt and rock causeway was been built four-fifths of the way across the canal from the Iolani School area to Kaiolu Street. A 50-foot passage was left on the makai side for boats.”
“The cranes will dig a trench 23 feet deep and four feet wide under the Ala Wai in which a 44,0000-volt cable will be buried. When this is accomplished, the causeway will be removed.” (Star Bulletin, September 11, 1956)
“As electricity use increased, the original cables were replaced in 1990 with higher capacity cables …. In 2002-03, when the Canal was last dredged, it was determined the cables were at risk of damage from dredging.”
“Hawaiian Electric, DLNR and the dredging contractor developed an interim solution to dredge around the cables. The current cable relocation project will be a permanent solution to not interfere with future dredging operations.” (HECO)
Then, “The State Department of Land and Natural Resources (DLNR) plans to dredge the Ala Wai Canal for flood control and increased recreational use starting in 2019, pending approval of permits. Hawaiian Electric currently has 46 kilovolt (kV) electrical cables buried under the canal that must be removed for efficient dredging.”
“Hawaiian Electric plans to install new 46kv cables about 40 feet below the canal using horizontal directional drilling. Once new cables are in service, the old cables will be removed. Hawaiian Electric plans to install new 46kv cables about 40 feet below the canal using horizontal directional drilling.”
“To minimize disruption from conventional trenching in the city streets, Hawaiian Electric will use horizontal directional drilling to install the new cables.”:
“As with any major construction, however, some short-term impacts are unavoidable. Hawaiian Electric will make every effort to limit closed traffic lanes, noise and dust.” (HECO)
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