Huilua was a kuapa type of fishpond. The 500-foot long rock wall is attached to the shoreline and encircles the ocean waters of Kahana Bay. The wall is built of rocks carried to the shoreline from the streambeds and valley slopes of Kahana. No mortar was used, but with the careful locking of the stones, the rock wall could withstand the daily wave action. The loose cobble and sand fill of the wall allowed the movement of water through the wall and into the pond. The width at the base of wall and the sloping sides provided stability. The walls were 3-4 feet wide and about 4 feet above the high tide.
It is uncertain when Huilua Fishpond was built,although many of the fishponds in Hawai’i were built between A.D. 1400 to 1600. Some credit the menehune with its construction which would make the fishpond very old. Numerous fishponds lined the coast of O’ahu in the past. These fishponds were especially abundant in Käne’ohe Bay and Pu’uloa (Pearl Harbor).
Information from Hawai’i State Parks.