|Sr. Engineering Technician:
||(209) 333-6800 x2674|
221 W. Pine Street
Lodi, CA 95240
This page provides geodetic control information in the City of Lodi.
The City will be updating to the North American Vertical Datum of 1988 (NAVD 88) and will no longer be using the National Geodetic Vertical Datum of 1929 (NGVD 29). Implementation of this update will apply to all improvement plans submitted (for first submittal) after January 1, 2017.
The updated benchmark map is provided at City Maps and includes both NAVD 88 and NGVD 29 elevations. Not all of the existing NAVD 29 benchmarks will be updated, however no benchmarks are being destroyed. The benchmarks that are not updated will be “retired” and will no longer be shown on the benchmark map. A list of all of the existing benchmarks and their NGVD 29 elevations is linked below. If a new project is based on a “retired” benchmark, the engineer / surveyor will be responsible for adjusting the elevations to a nearby (listed) NAVD 88 benchmark.
All survey work shall be in the California Coordinate System Zone III using the NAD83 (1991) datum. All maps submitted to the City must comply with City of Lodi Ordinance No. 1824.
City of Lodi GPS Network Grid
Record of Survey
Survey Monument Conservation
California Land Surveyors Association - Monument Conservation
City Maps - GIS.
Click HERE for instructions on how to retrieve benchmark information and acronyms of the GIS webpage.
Benchmark Archive (NGVD 29) - PDF
Note: The NGVD 29 benchmark information is provided for reference purposes only. It is the Surveyor and/or the Engineer of Record’s responsibility to ensure that all documents are prepared using the correct datum and that all reference elevations are adjusted appropriately.