F 115 — NGS JC0105 — Dupo, US

This trigonometric station is part of the National Geodetic Survey's network, which forms the foundation of the United States' horizontal control infrastructure. Located near Dupo, Illinois, at coordinates 38.50750° N, 90.21611° W, this trig point serves as a reference station for surveying and mapping activities across the region. Trig stations of this type were established to provide accurate positional control for cadastral surveys, engineering projects, and cartographic work. The NGS network remains essential for maintaining consistency in spatial data throughout the country. Verification and documentation of such benchmarks ensure the continued reliability of this infrastructure, particularly for surveyors conducting boundary determinations or large-scale engineering operations in the St. Louis metropolitan area vicinity.

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