Maricopa County

Land Survey

Locating a Benchmark for a MCDOT Project

  1. IT IS STRONGLY ADVISED YOU CHECK WITH THE CLIENT/AGENCY YOU ARE WORKING FOR TO DETERMINE WHICH BENCHMARK(S),  DATUM,  AND ACCURACY THEY REQUIRE.
  2. MCDOT uses the following list  in order of priority.
    1. - NGS Publish Vertical Monument
    2. - NGS Publish Horizontal Monument of A or B order only.
    3. - A Section Corner or Quarter Corner as on the Interactive Map.
  3. Follow the guide below to access the information.

In the navigation area to the left, select the Interactive Map link.
Select the Interactive Map link

After reading the disclaimer, hit the O.K. button.
disclaimer

When the Autodesk Map Guide program appears, it links you with the Maricopa County Flood Control GIS coverage.

Your query options are located in the upper toolbar on the right. They are:

  1. Address
  2. Street Intersection
  3. Township Range Section

Other common navigating tools are located in the toolbar.

    Zoom in on map using tool in upper left (the magnifying glass w/ plus sign).
    application example screen

As you zoom in the layers on the left hand sidebar of the screen will become available.
example screen

To find information:

  1. NGS/GDACS - Select the "pointer", double click the on the symbol to access the datasheet.NGS/GDACS screen
  2. This is what the NGS Data Sheet looks like. It has all of the National Geodetic Survey data about this particular monument.
    NGS Data Sheet
  3. To convert the information from NAVD88 or NGVD29 to NAVD88 or NGVD 29: Go to the NGS Website under "tools", select the VERTCON program