GLENDOVER — NGS RD2903 — Portland, US

This triangulation station is part of the National Geodetic Survey's network of control points that establish the fundamental horizontal datum for the United States. Located near Portland, Oregon at coordinates 45.52672°N, 122.51091°W, this trig point serves as a reference for surveying, mapping, and engineering projects throughout its region. Triangulation stations of this type historically formed the backbone of precise geodetic networks by providing accurately positioned points visible from distant locations. Such marks enable surveyors to tie local measurements to the national coordinate system and establish relative positions with high accuracy. Documentation and verification of benchmark locations remain essential for maintaining survey infrastructure integrity. As development and land use evolve, confirming the continued existence and accessibility of these control points preserves their utility for future surveying work and scientific applications requiring precise geographic reference.

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