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  • Surveying Information


    Benchmarks and High Accuracy Reference Network (HARN) Points


    To assist surveyors working in Jefferson County, we have developed a map showing the Colorado High Accuracy Reference Network (CHARN) and the North American Vertical Datum 1988 (NAVD 88) benchmarks in the county.

    The Geodetic survey control was established by the National Geodetic Survey (NGS), Colorado Department of Transportation (CDOT) and Jefferson County.

    To find survey point locations, use the county’s mapping service, jMap View exit disclaimer policy page for links to third-party websites.. Within this application and in the upper left-hand corner, click to open the jMap tab. From the layers menu, mark the checkbox next to Survey Control Points. Under Survey Control Points, mark the checkbox next to CHARN. Clicking on one of the survey control points will provide additional information including the Permanent Identifier (PID). The PIDs may be used to access data sheets from the National Geodetic Survey websiteYou are now leaving the jeffco.us website to an external site

    For complete data sheet information on the CHARN and NAVD 88 networks, please refer to the National Geodetic Survey home page. View exit disclaimer policy page for links to third-party websites.

    Land Surveys

    Since July 1, 1987, land surveys showing property boundaries must be filed with the Jefferson County Clerk and Recorder. Land surveys come in many forms. The most common are land survey plats, improvement survey plats, ALTA surveys and boundary surveys. Subdivision plats are different in that they divide land, typically through a city or county planning process, whereas land survey plats show the existing property boundary and often other land features.

    Topographic Data

    Recently updated topographic data, collected using LiDAR technology and covering Jefferson County is available at the Denver Regional Council of Governments (DRCOG) website. The area that covers the County is “Central A”. Users can search the DRCOG website by name or words such as LiDAR, DEM, contour etc. The DRCOG site is http://gis.drcog.org/datacatalog/.