1973 — NGS RD1590 — Portland, US

This triangulation station is part of the National Geodetic Survey's network that establishes the fundamental horizontal control framework for the United States. Located near Portland, Oregon at coordinates 45.55558° N, 122.57067° W, this trig point serves as a reference for surveying and mapping operations across the region. Triangulation stations such as this were historically observed and positioned to support large-scale geodetic networks. Their continued documentation and verification remain valuable for surveyors, engineers, and geospatial professionals conducting boundary surveys, infrastructure projects, and spatial analysis. Even where elevation data may not be formally recorded, horizontal position recovery and validation provide essential control information for local surveying work. The NGS network continues to serve as the authoritative geodetic infrastructure for the nation, and maintenance of accurate records for existing control points supports both historical continuity and modern surveying standards.

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