How can I find survey benchmark and triangulation station information?

Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey); information for those marks is available online. For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov

For information about marks set by the USGS, contact the National Geospatial Technical Operations Center at tnm_help@usgs.gov

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Cast Bronze Benchmark

Benchmarks can be divided into two general groups: the "vertical control points" are points that mark a very precise elevation above the standard datum plane (usually referred to as elevation above sea level) and the "horizontal control points" are points with precisely established latitude and longitude. The National Geodetic Survey, not the U.S. Geological Survey, is the

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