D 115 — NGS JC0103 — Dupo, US

This triangulation station is part of the National Geodetic Survey's comprehensive network of control points that form the foundation of horizontal positioning in the United States. Located near Dupo, Illinois, at coordinates 38.51583°N, 90.20861°W, this trig point serves as a reference marker for surveys and mapping activities throughout the region. Triangulation stations of this type were established to provide accurate, intervisible points for conducting large-scale surveys and determining precise distances and positions across the landscape. Such benchmarks remain valuable for verifying modern survey work, conducting cadastral surveys, and maintaining spatial data consistency. Documentation and verification of existing geodetic control points ensure their continued utility for professional surveyors and serve as reference standards for boundary establishment and infrastructure development. Surveyors should exercise due diligence in locating and confirming the condition of such marks before relying upon them for critical work.

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