From the record
“Huilua Fishpond, in O Kahana State Park on windward is one of the few surviving ancient Hawaiian fishponds that were still operational well into the 20th century. National Historic Landmark in 1962, shortly after it had been severely damaged by the 1960 tsunami.”
Wikipedia article Huilua Fishpond, CC BY-SA 4.0.
One of 154 National Register listings published here for Honolulu County · listed in 1966 · category: Structure · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

