SOH 85 — NGS DR2156 — Waipahu, US

This trigonometric station is part of the NGS network, which establishes the fundamental geodetic framework for the United States. Trig stations serve as primary control points for surveying and mapping operations, providing accurate horizontal positions for downstream surveys and engineering projects. Located near Waipahu on the island of Oahu, Hawaii, this benchmark contributes to the geodetic control network for the Hawaiian Islands. The coordinates 21.53878°, -158.04281° define its precise horizontal position. As with many classical trig stations, elevation data may not have been systematically recorded during original establishment. Verification and documentation of such control points remain essential for maintaining survey accuracy across generations of projects. Surveyors and engineers rely on these stations to ensure consistency in local, regional, and national mapping efforts. Preservation of this benchmark supports the integrity of Hawaii's surveying infrastructure.

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