CSL 13 — NGS AA8573 — St. Louis, US

This triangulation station is part of the National Geodetic Survey's network of control points establishing the geodetic framework for the United States. Located near St. Louis, Missouri, at coordinates 38.62934° N, 90.22212° W with an ellipsoidal elevation of 129.4 m, this trig point serves as a fundamental reference for surveying, mapping, and engineering activities across the region. Triangulation stations function as monumented positions of known spatial coordinates, enabling surveyors and geodesists to conduct precise measurements and establish local control networks. The NGS network represents decades of accumulated geodetic observations and remains essential infrastructure for civil engineering projects, cadastral surveying, and scientific applications requiring positional accuracy. Verification and documentation of such control points are critical for maintaining the integrity and usability of the national geodetic system. Professional surveyors rely on accurate coordinates and monumentation records to ensure consistency in spatial data across projects and jurisdictions.

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