GMA 9 Joint Planning Committee

Next Meeting:
Monday, March 22, 2021 

TGR Takes Part in Regional Water Planning

The TGRGCD was created to address groundwater issues or problems within the District overlaying Trinity group of aquifers. The District includes data from the TWDB’s Groundwater Availability Models (GAMs), input from the Groundwater Management Area 9 cooperative planning process, public input, and the most current and accurate site-specific data available in the development of its management plan to preserve, protect and conserve the Aquifer.


The District also cooperates with adjacent groundwater districts, Groundwater Management Area 9, Regional Water Planning Groups, local water purveyors and stakeholders, and adjacent counties with similar aquifers and/or groundwater usage to ensure a collaborative means of protecting water supplies in this area of the state.

TGR Research and Aquifer Studies

USGS Spring Survey Results


US Geological Survey has compiled and released a spring survey report. USGS partnered with TGRGCD, Edwards Aquifer Authority and San Antonio River Authority to create a geodatabase of springs throughout northern Bexar County.


Geodatabase and Characteristics of Springs Within and Surrounding the Trinity Aquifer Outcrops in Northern Bexar County, Texas, 2010–11


LBG-Guyton Structure Maps and Stratigraphy Dataset for TGRGCD


LBG-Guyton Associates prepared a stratigraphic dataset and two structure maps for the Trinity Glen Rose Groundwater Conservation District in Northern Bexar County.  The structure maps represent the top of the lower Glen Rose and top of the Cow Creek formations, within the Trinity Aquifer.

LBG-Guyton Structure Report - PDF

Structure Map Lower Glen Rose - PDF


Structure Map Cow Creek - PDF

Physical: 14789 Old Bandera, Ste. 105
Helotes, Texas 78023

Mailing: 12790 FM 1560 N. Box 1589
Helotes, Texas 78023

Phone (210) 698-1155 

Fax (210) 698-1159

Disclaimer: The information on this website is compiled and made available as a public service by the Trinity Glen Rose Groundwater Conservation District (TGR). However, TGR makes no warranty as to the accuracy, reliability, or completeness of the information and is not responsible for any errors or omissions or for results obtained from the use of the information. Distribution of the information does not constitute such a warranty. Use of the information is the sole responsibility of the user. Links provided on this website are being provided as a convenience and for informational purposes only; they do not constitute an endorsement or an approval by TGR of any of the products, services or opinions of the corporation or organization or individual. TGR bears no responsibility for the accuracy, legality, or content of the external site or for that of subsequent links contained in the external site. Contact the external site for any answers to questions regarding the links content. Geological and hydrogeological data and graphics included in this website are provided in draft form only, except for those documents which have the seal of a Registered Professional Geoscientist or Registered Professional Engineer affixed.

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