N 146 — NGS JC0082 — Cahokia, US

This triangulation station is part of the NGS network, which comprises reference points fundamental to the United States' geodetic infrastructure. Trigonometric stations like this one serve as control points for surveying, mapping, and engineering projects requiring precise horizontal positioning. Located near Cahokia, Illinois, at coordinates 38.57611° N, 90.16500° W, this benchmark contributes to regional geodetic control in the Mississippi River valley area. The trig point type indicates its historical use in triangulation networks that established and maintained accurate spatial references across the country. Verification and documentation of such monuments remains valuable for surveyors, engineers, and cartographers who depend on well-established control networks. The coordinates provided offer direct access to this reference point for users requiring connections to the national geodetic datum.

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