GIS Data
All GIS datasets are available for download in ArcGIS 9.x geodatabase or shapefile formats. All datasets are in DD NAD 83. Please click a data category below to open or right click to save the datasets to your desktop. To preview the data, please click the thumbnail for a larger image. All shapefiles are zipped.
Note: For Lake Contour Data or Bathymetric Data, please refer to the Hydrographic Surveys.
Natural Features
The GIS datasets listed below are related to various types of natural features. Although TWDB utilitizes this data in our most commonly used maps, some of the datasets were created and are maintained by other state and federal agencies.
Major Aquifers - The 9 major aquifers of Texas as defined by the TWDB, Updated December 2006.
Minor Aquifers - The 21 minor aquifers of Texas as defined by the TWDB, Updated December 2006.
Major River Basins - The 23 major U.S.G.S. river basins of Texas, * These are not the 'official' TWDB basin boundaries.
Hydrologic Unit Code - HUC - Based on the USGS national hydrologic 8-digit coding system, Technically considered 'sub-basins'.
Existing Reservoirs - Existing reservoir boundaries updated using 'NHD' and TWDB Lake survey data, Updated December 2007.
Existing Reservoirs Geodatabase
Existing Reservoirs Shapefile
Texas Precipitation - Average monthly and annual precipitation for the climatological period 1961-90.
Major Rivers - Data extracted from NHD, 1:100,000 layer, Oct. 2009
Texas Hillshade - Background image used in statewide maps, Generated from DEMs.
Texas Terrain Color Ramp - Texas hillshade raster plus color ramp.
Administrative Boundaries
Boundaries for various administrative units including: Regional Water Planning Areas and Groundwater Conservation Districts are approximate and may not accurately depict legal descriptions.
Groundwater Conservation Districts - Groundwater conservation districts in Texas. The original data was acquired from TCEQ. Dataset is current as of April 2010.
River Authorities and Special Law Districts - Statutory boundaries (but not necessarily the service areas) 1999.
Groundwater Management Areas - GMAs - Groundwater Managment Area boundaries, approved December 2011.
Priority Groundwater Management Areas - PGMA - Updated Oct. 2009, as designated by TCEQ.
PFCA Regions and Field Office - Geographic area assignments for Regional Project Teams and Inspection & Field Support Services Offices.
Regional Water Planning Areas - The 16 Water Planning Regions in Texas, as created by TWDB, updated March 2008.
Well Data from TWDB Groundwater Database - Updated April 2013.
TWDB Well Location Grid