SanGIS has completed all training and all arrangements with the US Geological Survey (USGS) to take on full stewardship of the National Hydrography Dataset (NHD) for San Diego County. The National Hydrography Dataset is the surface water component of The National Map. The NHD is a comprehensive set of digital spatial data representing the surface water of the United States using common features such as lakes, ponds, streams, rivers, canals, and oceans.

As steward for the NHD in San Diego County, SanGIS is the source agency to make edits, updates, additions, and deletions. Change requests, once validated, will be made on a local copy of the NHD at SanGIS and uploaded on a periodic basis to USGS where the revised dataset is validated before being posted to the official NHD site.

Anyone can request edits and updates to the NHD for San Diego County by contacting SanGIS. City of San Diego and County of San Diego JPA partners are encouraged to use the SanGIS Forum to record changes. Just go to http://sanweb.sangis.org/forum/. Users that do not have a Forum logon can email their changes to SanGIS via webmaster@sangis.org. Or give us a call at 858-874-7000.

SanGIS looks forward to hearing from you on how to improve the NHD in San Diego County.

The official source for NHD is the USGS' National Hydrography Dataset Site. You can get the most current official data by visiting http://nhd.usgs.gov/data.html.

Check the links below for more information on NHD.

What is the National Hydrography Dataset?
How is the NHD Data Organized?
Where Can I see the NHD Data?
What is NHD Stewardship?
How is the NHD Updated?
How Can I Help?
How Do I Submit an Update to the NHD?
How Does the NHD Differ from FEMA Flood Plain Data?
Where Can I Get More Information?