N 284 — NGS JC1148 — Cahokia, US

This triangulation station is part of the National Geodetic Survey's classical control network, which establishes fundamental horizontal reference points across the United States. Situated near Cahokia, Illinois, at coordinates 38.58500° north latitude and 90.19306° west longitude, this trig point serves as a monumented position for geodetic surveys and mapping activities throughout the region. Triangulation stations of this type provided essential ground control for topographic mapping, cadastral surveys, and engineering projects prior to the modern GPS era. The point's location in southwestern Illinois, proximate to the Mississippi River corridor, positions it within an area of significant transportation and infrastructure development. Proper documentation and periodic verification of such control points remain valuable for surveyors conducting precise work, ensuring consistency in local coordinate systems, and maintaining historical geodetic records. This benchmark contributes to the institutional memory of the nation's surveying infrastructure.

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