PORTLAND BURNSIDE BRIDGE E TWR — NGS RD3215

This triangulation station is part of the National Geodetic Survey's network of control points that establish the geometric framework for surveying and mapping across the United States. Located near Portland, Oregon, at coordinates 45.52291° N, 122.66704° W, this trig point serves as a reference for horizontal control in the region. Trigonometric stations like this one were historically established through networks of measured angles and distances, providing surveyors with accurate positional data for property surveys, construction projects, and cartographic work. Documentation and verification of such benchmarks remain valuable for maintaining survey integrity, establishing legal boundaries, and supporting infrastructure development. Modern positioning technologies complement but do not eliminate the utility of these classical control points for ensuring consistency in local surveying practice.

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