E 115 — NGS JC0104 — Dupo, US

This triangulation station is part of the National Geodetic Survey's network, which establishes the foundational control points for surveying and mapping across the United States. Located near Dupo, Illinois, at coordinates 38.51417° N, 90.20750° W, this trig point serves as a reference for local and regional surveying operations. Triangulation stations like this one were historically established to create the precise horizontal control network underlying geodetic work in their respective areas. The point's documented location and elevation data enable surveyors, engineers, and cartographers to tie their measurements to a standardized national framework. Verification and maintenance of such benchmarks remain important for ensuring the integrity of surveying networks and for supporting infrastructure projects, land records, and geographic information systems that depend on accurate positional reference data.

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