A 285 — NGS JC1135 — Cahokia, US

This trigonometric station is part of the National Geodetic Survey's network of control points that establish the geometric framework for surveying and mapping throughout the United States. Trig stations serve as precisely positioned reference marks used to control horizontal surveys and provide accurate coordinates for subsequent local surveys and engineering projects. Located near Cahokia, Illinois, this benchmark contributes to the regional geodetic infrastructure in the Mississippi River valley area. The station's published coordinates enable surveyors to tie their local measurements into the national coordinate system with demonstrated accuracy and consistency. Documentation and periodic verification of such control points remain essential for maintaining the integrity of the nation's surveying network. Field verification confirms the monument's physical condition and ensures reliable access for future survey work. This point's continued availability supports professional surveying standards and coordinate accuracy for civil engineering, property surveys, and geospatial applications.

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