Guadalupe County Monitoring Sites

Putting your cursor over the stream site number on the map below will generate a picture of the site (if available). Clicking on the site number will take you down the page to a table of sites with locations, parameters and frequency of analysis. Below the table is a legend defining the abbreviations used in the table.

TCEQ Station ID #12596TCEQ Station ID #12596: Lake Dunlap - Guadalupe River north bank at AC's Place at midpoint of Lone Star Drive
TCEQ Station ID #14932TCEQ Station ID #14932: Geronimo Creek at SH 123

Guadalupe River Basin Surface Water Quality Monitoring Program
GBRA Monitoring Locations

TCEQ Station ID Description Latitude/ Longitude Parameters/ Frequency* Monitoring Types/By Historical Data
12576 Geronimo Creek at Haberle Road 3 miles south of Geronimo 29°37'48" / 97°56'24" C/Monthly; F/Monthly; BAC/Monthly Fixed/GBRA PDF | Excel
12596 Lake Dunlap - Guadalupe River north bank at AC's Place at midpoint of Lone Star Drive 29°40'15" / 98°04'48" C/Monthly; F/Monthly; BAC/Monthly Fixed/GBRA PDF | Excel
14932 Geronimo Creek at SH 123 29°40'12" / 97°57'53"   No longer monitored PDF
15149 Lake McQueeney, 0.5 mile upstream of McQueeney Dam on southeast bank 29°36'34" / 98°02'10" C/Monthly; F/Monthly; BAC/Monthly; D024/6x Fixed/GBRA PDF | Excel
17134 Guadalupe River at FM 1117 river crossing 29°32'9" / 97°52'51" C/Quarterly; BAC/Quarterly; F/Quarterly Fixed/GBRA PDF | Excel

Guadalupe River Basin Surface Water Quality Monitoring Program
TCEQ Monitoring Locations

12595 Guadalupe River bridge at IH 10 west of Seguin 29°33'30" / 98°01'54" C/Quarterly; BAC/Quarterly; F/Quarterly; M/Semi-ann; M-sed/Semi-ann Fixed/TCEQ** TCEQ

** The ability to look up data for a specific Station ID on the TCEQ website is no longer available. However, by using the TCEQ link above, it is possible to download text files for a segment; so if you know the segment, you can scroll down to it and select it for downloading. The data download query requires a great deal of knowledge of not only converting and combining text files, but also for understanding and looking up the codes in the Data Management Reference Guide.


The C symbol represents the following parameters and their TCEQ codes: 00010, Temperature, Water (Centigrade); 00094 Conductivity, Field (mmhos/cm @ 25C); 00300 Oxygen, Dissolved (mg/L); 00400 pH (standard units); 00631 Nitrate/Nitrite-Nitrogen (mg/L as N); 00665 Total Phosphorus (mg/L as P); 00530 Solids, Total Suspended (mg/L); 82079 Turbidity (NTU); 00945 Sulfate (mg/L); 00940 Chloride (mg/L); 32211 Chlorophyll-a (mg/L); 00900 Total Hardness (mg/L); and 31648 E. coli (#/100 mL).

The F symbol means that a flow measurement will be provided. When possible, this information will be derived from U.S. Geological stream gages; at some sites, the proximity of a hydroelectric generating facility allows the calculation of flow based upon power generated; at the remainder of the sites field measurements will be made by GBRA Lab personnel or UGRA personnel.

The M symbol denotes metals. All M samples will be collected by the GBRA. The dissolved metals to be analyzed for are 01106 Aluminum (mg/L as Al); 01090 Zinc (mg/L as Zn); 01000 Arsenic (mg/L as As); 00915 Calcium (mg/L as Ca); 01025 Cadmium (mg/L as Cd); 00925 Magnesium (mg/L as Mg); 46570 Hardness, calc, (mg/L as CaCO3); 01005 Barium (mg/L as Ba); 01030 Chromium (mg/L as Cr); 01040 Copper (mg/L as Cu); 01046 Iron (mg/L as Fe); 01049 Lead (mg/L as Pb); 01056 Manganese (mg/L as Mn); 01065 Nickel (mg/L as Ni); 01060 Molybdenum (mg/L as Mo); 01145 Selenium (mg/L as Se); 71890 Mercury, total (mg/L as Hg); and 01075 Silver (mg/L as Ag).

AC means Aquatic Commun-Habitat.

RN means Routine Nekton.

N/A means not active. The station is not being monitored.

RB means Routine Benthics.

FT means Fish Tissue.

BAC means TSWQS Bacteria sampling.

O means organics in water.

D024 means dissolved oxygen measurements over a 24 hour period.

© 1998 Guadalupe-Blanco River Authority