O‘ahu used to be nearly twice as big as it is now.  (Thompson) The Island consists of two major shield volcanoes: Waiʻanae and Koʻolau; the eroded remnants of which are the Waiʻanae Range and the Koʻolau Range.

Koʻolau volcano started as a seamount above the Hawaiian hotspot around 4-million years ago. It broke sea level some time prior to 2.9-million years ago.

About 2-million years ago, much of the northeast flank of Koʻolau volcano was sheared off and material was swept onto the ocean floor (named the Nuʻuanu Avalanche) – one of the largest landslides on Earth.

The Pali is the remaining edge of the giant basin, or caldera, formed by the volcano. At its base are the towns of Kāne’ohe, Kailua and Waimānalo – beyond that, open ocean. The other half of the caldera, an area the size of Brooklyn, tore away and tumbled into the ocean.  (Sullivan)

Mōkapu Peninsula (where Marine Corps Base Hawai‘i is situated) is evidence of subsequent secondary volcanic eruptions that formed Ulupaʻu Crater (the large hill on the Kailua side of the peninsula,) Pu‘u Hawaiiloa (the central hill that originally had the base control tower, now has radar (‘the hill’,)) Pyramid Rock and the nearby Moku Manu (Bird Island.)

Coral reefs and marine terraces were formed at different elevations due to the changing sea levels over time.  There are some broad lowland areas in the lower reaches of deeply alluvial valleys. (Moberly)

Mōkapu Peninsula is part of two ahupua’a in the district of Ko‘olaupoko: He‘eia and Kāne‘ohe. He‘eia ahupua’a encompasses the western third of the peninsula (called the ‘iii of Mōkapu) and extended inland; Kāne‘ohe ahupua‘a is on the eastern two-thirds of the peninsula.

Hawaiians lived on Mōkapu Peninsula for at least 500 to 800 years before Western Contact. Farmers cultivated dryland crops like sweet potato for food, and gourds for household utensils.

They tended groves of hala (pandanus) trees for the lauhala (leaves) to weave into mats and baskets, and wauke plants for kapa (paperbark cloth). The highly prized wetland taro might have been grown in the marshy area at the center of the peninsula.

Mōkapu people fished in the protected waters of Kāne‘ohe Bay, in Kailua Bay, and in the deep ocean to the north; and took advantage of the rich shore resources.

There were at least two small villages on the peninsula, as well as scattered houses along the coastline. With walls up to six feet wide, the massive fishponds of Mōkapu are an indication of political significance since only chiefs could command the labor to build such monuments. They were being used from as early as the 15^th or 16^th centuries.

British Captain James Cook made landfall in Hawai‘i in 1778, the first documented Western contact with the islands. He was followed in short order by European and American explorers and traders.

In the first decades after Western Contact, Honolulu was the focus of interactions between Hawaiians and foreigners. On remote Mōkapu Peninsula, separated from urban Honolulu by the high, sheer Pali, life continued in the cycle of subsistence farming.

Mōkapu, and Kāne‘ohe, in general, were far from the attentions of foreigners. It was not until the US Exploring Expedition of 1840-1841 that Kāne‘ohe Bay and its environs were documented in detail.

Under King Kamehameha III, the most important event in the reformation of the land system in Hawai‘i was the separation of the rights of the King, the Chiefs and the Konohiki (land agents) through the Great Mahele in 1848.

The King retained all of his private lands as his individual property; one third of the remaining land was to be for the Hawaiian Government; one third for the Chiefs and Konohiki; and one third to be set aside for the tenants, the actual cultivators of the soil.

Paki (father of Bernice Pauahi Bishop) received the ahupua‘a of He‘eia, including the ‘ili of Mōkapu. Kamehameha III kept the ‘ili of Kuwa‘ahohe in the center of the peninsula, as well as Halekou and Kaluapūhi ponds; Kalama, his wife, received most of the ahupua‘a of Kāne‘ohe including Nu‘upia Fishpond.

Following Paki’s death in 1855, the Sumner brothers, John and William, bought the ‘Ili of Mōkapu.  In 1885, John Sumner became sole owner when his brother died. In 1892, John left Mōkapu in a trust to his nephew, Robert Wyllie Davis (the son of Sumner’s younger sister Maria).

In the first half of the 20th century, truck farms and commercial plantings replaced the traditional subsistence gardens on almost all of the tillable land of the peninsula, including inside Ulupa‘u Crater.

Watermelon thrived in the hot and sunny, loamy soil of the peninsula – papaya, sweet potato, Irish potato, pumpkins, squash, and sweet corn were also grown.   The Japanese farming community was about where the MCBH runway is today .

One of the earliest commercial efforts was Albert van Clief and Addie Gear’s cotton plantation. “Strange as it may seem our cotton pickers are Hawaiian. … We have three Hawaiian women and one Hawaiian man and a Korean couple.” (Hawaiian Gazette, Dec 10. 1910)  But hard times for the Gears quickly followed.

Chinatown was the primary market for the Mōkapu farmers.  The Maui News of June 21, 1918, reported that Mōkapu farmer N. Ewasaki won second place for “Best ten-pound any white variety” of Irish potatoes at the annual Maui County.

As early as 1890, Joseph Paul Mendonça and his partner Christel Bolte had been leasing the former Kāne‘ohe Ahupua‘a lands of Queen Kalama. A journal entry on June 1, 1893, noted “We commenced today doing business under the name of Kāneʻohe Ranch”.

They started with the herd with imported Angus cattle, purchased from James I Dowsett, one of the founders of the ranching industry in Hawai‘i. Horses, sheep, and goats rounded out the livestock assets.

Then, Mendonça was ready for a change; the Ranch ledger entry for December 31, 1899 stated, “Joe Mendonça is ‘pau ke aloha’ with Kaneohe, he wants to sell out or do something, he does not exactly know what ….” (MCBH) By 1905, James B.Castle was a shareholder in the Ranch.

In 1917, Castle’s son, Harold KL Castle, purchased the ranch. Harold Castle and his family spent weekends at their beach home on the ocean side of the high Heleloa Dune.

Kāne‘ohe Ranch was the main cattle operation (on the eastern portion of the peninsula); Robert Davis and later Arthur H. Rice, Sr., had their own smaller herds in the former ‘ili of Mōkapu. Scattered wild lands were covered in kiawe, hau, and haole koa trees, and lantana and feral tomatoes were rampant.

In 1921, the Territory of Hawai‘i established a game farm on Mōkapu Peninsula. The farm contained about 350-acres, which included Halekou and Kaluapūhi fishponds.  As a part of the farm program, the Territory also initiated a reforestation program at Mōkapu in which about 5,000 trees had been planted by the end of 1930, and about 2,000 coconuts in 1932.

The tract of land that Mōkapu Game Farm was developed on was described in 1929 as “an arid waste, barren, silent, almost desolate” (Honolulu Star Bulletin Oct. 31, 1929). At the end of 1930, 185 acres of the land had to be fenced to protect it from “wandering stock” (Hawaii, Terr., Bd. Comm. Ag. & For. 1931:118) (Maly)

The Mōkapu Game Farm raised and released many types of game birds, including: Pheasants (the primary bird raised and released); California quail, Gambel’s quail, and Japanese quail; Chukars; Guinea fowl; Ducks; and others. The birds were raised and released to benefit hunters and to increase agricultural yield by preying on plantation pests.

Folks at the Game Farm apparently also raised Japanese oysters in the nearby mud flats by the old Wilson Pier, used by the Territorial Game Farm that was situated near the location of the present H-3 interchange. (George Davis; Maly)

In the 1920s, the peninsula was a private holding with no access to the general public, and there were few permanent residents. Wally Davis and the Date family lived at Davis Point in southwestern Mōkapu. Some Japanese farmers had homes on the peninsula, but many lived in Kailua or Kāne‘ohe and came to the peninsula only to work their fields.

Dr. George Straub and members of the Kawainui Shooting Club were periodic visitors to their places along the Kailua Bay frontage. The supervisor of the Territorial Game Farm had a residence at Halekou Fishpond.

The ‘ili of Mōkapu became the “Fisherman’s Paradise” with development of the Mōkapu Tract Subdivision – “A private sea fishery is an appurtenant to the land, in which lot owners are given the privilege of fishing for personal.”

Beach lots were offered for sale from $1,000 and up; and second tier lots with rights of way to the beach for $500 and up.  “Put on the market in 1932, Mōkapu has met with exceptional success.”  (Maly)

In 1934, a radio facility was built by Pan American Airways on the crest of He‘eia Dune, roughly between Pyramid Rock and the north end of the present Runway 4/22. It was used as a link for Pan Am trans-Pacific flights, that started in 1935.

In 1918, through Executive Order 2900, President Woodrow Wilson designated 322 acres in the central portion of Mōkapu Peninsula as the Army’s Kuwa‘ahohe Military Reservation. Deactivated at the end of World War I, the reservation was leased for ranching until 1939, when it was reactivated as Fort Kuwa‘aohe.

In December 1940, Fort Kuwa‘aohe was renamed Fort Hase, in honor of Major General William F Hase, who served as Chief of Staff of the Army’s Hawaiian Department from April 1934 to January 1935. It served as headquarters of the Harbor Defenses of Kāne‘ohe Bay.

On the western side of the peninsula, Naval Air Station (NAS) Kāne‘ohe was established in 1939; a base for squadrons of seaplanes to support the Pearl Harbor fleet was developed.

The work included dredge and fill operations that added 280 acres to the Kāne‘ohe Bay side of the peninsula, as well as filled low-lying areas for runway and hangar construction.

The great bulk of all reef material dredged in Kāne‘ohe Bay was removed in connection with the construction at Mōkapu of the Kāne‘ohe Naval Air Station (now Marine Corps Base Hawai‘i) between 1939 and 1945.

Dredging for the base began on September 27, 1939, and continued throughout World War II.  A bulkhead was constructed on the west side of Mōkapu Peninsula, and initial dredged material from the adjacent reef flat was used as fill behind it.

In November 1939, the patch reefs in the seaplane take-off area in the main Bay basin were dredged to 10-feet (later most were taken down to 30-feet.)

Other early dredging was just off the northwest tip of the peninsula, near the site of the “landing mat” (runway.)  It appears that a fairly reliable total of dredged material is 15,193,000 cubic yards.

(Do the Math … Let’s say the common dump truck load is 10 cubic yards … that’s a million and a half truckloads of dredge material.)  The runway was about half complete at the time of the Japanese attack on December 7, 1941. (Lots here is from Tomonari-Tuggle & Arakaki)

© 2025 Ho‘okuleana LLC