C 115 — NGS JC0101 — Dupo, US

This triangulation station is part of the National Geodetic Survey's legacy network, which established the foundational control framework for surveying and mapping across the United States. Located near Dupo, Illinois, this trig point served as a reference station for horizontal positioning and distance measurement in regional surveys. Triangulation stations of this type were monumented as part of systematic geodetic work to provide surveyors, engineers, and cartographers with accurate positional control. The station's coordinates at 38.51861°, -90.21083° locate it within the St. Louis metropolitan region. Modern surveying professionals value the documentation and verification of these historical control points. Even where elevation data remains incomplete, such monuments contribute to understanding the evolution of geodetic networks and may serve as supplemental references for contemporary surveys. Proper cataloging ensures this infrastructure remains accessible for future surveying activities and historical geodetic research.

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