V 284 — NGS JC1144 — Cahokia, US

This trigonometric station is part of the National Geodetic Survey's network, which establishes the fundamental control infrastructure for surveying and mapping across the United States. Trig stations like this monument serve as primary reference points for horizontal control, enabling surveyors and mapping professionals to reference their local work to the national coordinate system. Located near Cahokia, Illinois, this benchmark contributes to geodetic coverage in the Mississippi River region. The coordinates provided (38.54639°N, 90.13000°W) establish its precise location within the NAD83 or related reference frame. Verification and documentation of such control points remain essential for maintaining survey accuracy, supporting infrastructure projects, and ensuring consistency in spatial data across jurisdictions. Professionals conducting work in this area may utilize this station as a basis for establishing local control networks.

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