A 115 — NGS JC0096 — Dupo, US

This triangulation station is part of the National Geodetic Survey's network, which forms the foundation of the United States' horizontal and vertical control system. Trig stations serve as primary reference points for surveying, mapping, and engineering projects across the country. Located near Dupo, Illinois, at coordinates 38.53583°N, 90.20333°W, this benchmark contributes to regional geodetic infrastructure in southwestern Illinois. Triangulation stations like this one were historically established to create an accurate, interconnected framework of known positions. Survey professionals use such control points to verify instrument accuracy, establish local coordinate systems, and ensure consistency across multiple projects. Documentation and periodic verification of these monuments remain valuable for maintaining the integrity of cadastral records, infrastructure development, and public works. Access to reliable geodetic data supports both contemporary surveying operations and historical continuity in spatial information.

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