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. 

Learn more: 

• Introduction to Land Survey Benchmarks
• National Geodetic Survey Web Map
• National Geodetic Survey Bench Mark Reset Procedures