LADY ISLAND RANGE FRONT — NGS RD4138 — Multnomah County, US

This triangulation station is part of the National Geodetic Survey's primary control network, which establishes the foundational reference framework for surveying and mapping throughout the United States. Located in Multnomah County, Oregon, at coordinates 45.56285° N, 122.44768° W, this trig point serves as a monumented survey control station. The ellipsoidal elevation of -8.9 meters reflects the vertical datum reference for this location. As a trig station, this point was historically established through triangulation methods to create precise horizontal and vertical control across regional survey networks. Modern surveyors and GIS professionals rely on documented benchmarks like this for establishing accurate position references in construction, infrastructure projects, and spatial data applications. Verification and maintenance of such control points ensures the integrity of the nation's surveying infrastructure and supports continued accuracy in engineering and mapping work across the region.

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