M 146 — NGS JC0085 — Cahokia, US

This triangulation station is part of the National Geodetic Survey's network of control points that form the foundational framework for mapping and surveying across the United States. Located near Cahokia, Illinois, this trig point serves as a reference station for establishing horizontal positions and elevations in the region. Triangulation stations of this type were established to provide accurate geodetic control for large-scale surveying projects, property demarcation, and infrastructure development. The point's coordinates at 38.57250°, -90.17278° place it in southwestern Illinois. As with all NGS benchmarks, verification and documentation of this station's condition, monumentation, and accessibility remain valuable for surveying professionals conducting land surveys, engineering projects, and geodetic research. Regular recovery and maintenance of such control points ensures the integrity of the geodetic network.

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