Hawaii Triangulation Station - Round Top



Jerry Penry
November 27, 2012

The location for Round Top hill is north of Honolulu on the island of Oahu and is in Pu'u Ualaka'a State Wayside park. The original monument at this site was reportedly removed during WWII. It was then reestablished in 1968 in a 5-foot square concrete pad. Using a handheld GPS receiver, I went to the location, but nothing visible exists. The observation platform for the park appears to be fairly modern and reconstruction of a nearby walkway, platform, and picnic shelter may have removed the monument. It is certainly newer that the last recovery description that was made in 1969. There is a slight indentation in the grass where the GPS position indicates the monument should be located, but the ground was not probed.

This location requires quite a bit of switchback driving on Round Top Drive to get to the top of the hill, but the parking area is only a short distance away. The view from the hill is one of the best on Oahu. The entire Honolulu area can be seen as well as the Diamond Head crater area. The view is well worth the effort to go to the location.

The area where the monument should be located is in the grass at the lower part of the image.

The walkway leading to the observation platform.

The walkway entrance to the observation platform at the parking lot.

The view of Diamond Head Crater from Round Top Hill.

Another view of Honolulu taken from the observation platform.

Other Hawaii Survey Markers

© Jerry Penry 2012