CLAY — NGS HS3573 — Clayton, US

This NGS triangulation station is located near Clayton in Contra Costa County, California, at coordinates 37.94833°N, 121.95028°W. As a trig point within the National Geodetic Survey's network, it serves as a fundamental control station for establishing accurate horizontal positions across the United States. Triangulation stations of this type have provided the geometric framework for large-scale surveying, mapping, and engineering projects throughout their operational history. The point's location in the San Francisco Bay Area region positions it within a densely surveyed zone critical to regional infrastructure development. Verification and proper documentation of such benchmarks remain valuable for surveyors performing boundary work, construction layout, and geodetic research. Maintaining accurate records of these control points supports the continuity of the national geodetic datum and enables professionals to reference reliable spatial data for contemporary surveying applications.

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