Calhoun 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 #12578TCEQ Station ID #12578: Guadalupe River upstream of Lower Guadalupe Diversion Dam and Salt Water Barrier

Guadalupe River Basin Surface Water Quality Monitoring Program
GBRA Monitoring Locations

TCEQ Station ID Description Latitude/ Longitude Parameters/ Frequency* Monitoring Types/By Historical Data
12578 Guadalupe River upstream of Lower Guadalupe Diversion Dam and Salt Water Barrier 28°30'24" / 96°53'09" C/Monthly; M/Annually; F/Monthly; BAC/Monthly Fixed/GBRA PDF | Excel

Guadalupe River Basin Surface Water Quality Monitoring Program
TCEQ Monitoring Locations

TCEQ Station ID Description Latitude/ Longitude Parameters/ Frequency* Monitoring Types/By Historical Data
12536 Victoria Barge Canalat SH 35 28°31'12" / 96°48'00" No monitoring scheduled for 2006   TCEQ
12577 Guadalupe River tidal bridge at SH 35 NE of Tivoli 28°28'36" / 96°51'48" C/Quarterly; BAC/Quarterly; DO24/Quarterly Fixed/TCEQ** TCEQ
13383 Lavaca Bay at SH 35 Causeway 28°38'20" / 96°36'32" C/Quarterly; BAC/Quarterly; DO24/Ann Fixed/TCEQ** TCEQ
13384 Lavaca Bay 'Y' intersection of Port Lavaca and MatagordaShip Channels at Marker 66 28°35'46" / 96°33'43" C/Quarterly; BAC/Quarterly; DO24/Ann Fixed/TCEQ** TCEQ
13385 Lavaca Bay at Alcoa Ship Channel off loading dock 28°39'36" / 96°34'48" C/Quarterly; BAC/Quarterly; DO24/Quarterly; M/Semi-ann; M-sed/Semi-ann; O-sed/Semi-ann Fixed/TCEQ** TCEQ
13386 Cox Bay SE of Point Comfort 28°37'48" / 96°32'24" C/Quarterly; BAC/Quarterly; O-sed/Semi-ann; M-sed/Semi-ann; M/Semi-ann Fixed/TCEQ** TCEQ
13396 Espiritu Santo Bay Intersection of Ferry and Intercostal 28°34'36" / 96°28'48" C/Quarterly; BAC/Quarterly TCEQ** New
13397 San Antonio Bay at CM 17 28°16'48" / 96°43'12" C/Quarterly; BAC/Quarterly Fixed/TCEQ** TCEQ
13563 Lavaca Bay 152 meters SSW of CM22 in Red Bluff Channel 28°40'48" / 96°34'48" C/Quarterly; BAC/Quarterly; M/Semi-ann; M-sed/Semi-ann; O-sed/Semi-ann; O/Semi-ann Fixed/TCEQ** TCEQ
14726 Powderhorn Lake 28°30'22" / 96°29'20" C/Quarterly; BAC/Quarterly Fixed/TCEQ** TCEQ
14951 Espiritu Santo Bay at ICWW at Fulgrums Fishing Camp 28°21'54" / 96°34'41" C/Quarterly; BAC/Quarterly 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

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