|Site Number||USGS Station Name||Flow Sample Time||Flow Volume|
|08177700||Olmos Ck at Dresden Dr, San Antonio, TX||04/20 at 11:00 AM||0.58 ft3/s|
|08178000||San Antonio Rv at San Antonio, TX||04/20 at 11:00 AM||29.7 ft3/s|
|08178050||San Antonio River at Mitchell Street, San Antonio, TX||04/20 at 11:30 AM||83.2 ft3/s|
|08178500||San Pedro Creek at Furnish, San Antonio, TX||04/20 at 11:00 AM||13.1 ft3/s|
|08178565||San Antonio River at Loop 410, San Antonio, TX||04/20 at 11:15 AM||88.1 ft3/s|
|08181800||San Antonio River near Elmendorf, TX||04/20 at 11:30 AM||531 ft3/s|
|08183200||San Antonio River near Floresville, TX||04/20 at 11:00 AM||625 ft3/s|
|08183500||San Antonio River near Falls City, TX||04/20 at 11:15 AM||1000 ft3/s|
|08186000||Cibolo Creek near Falls City, TX||04/20 at 11:15 AM||80.9 ft3/s|
|08188500||San Antonio River at Goliad, TX||04/20 at 11:00 AM||668 ft3/s|
The following links are to existing NOAA stations, and do not necessarily correspond to the USGS stations listed above. They are provided as additional data to help you determine how you can enjoy the river the most.
|Station ID||Station Name||Bacteria Collection Time||E. coli Bacteria Result|
|S0069||San Pedro Creek Culture Park (San Pedro Creek immediately downstream of tunnel inlet)||04/17 at 2:27 PM||300 mpn
|14256||San Antonio River at Mitchell Street, San Antonio, TX||04/17 at 1:55 PM||120 mpn
|17066||San Antonio River at Mission Road, San Antonio, TX||04/17 at 1:41 PM||250 mpn
|12897||San Antonio River at Interstate 410 Camino Coahuilatechan, San Antonio, TX||04/17 at 1:11 PM||170 mpn
|12881||San Antonio River at SH 97 near Floresville, TX||04/17 at 11:51 AM||160 mpn
|12879||San Antonio River at FM 791 S.W. of Falls City, TX||04/17 at 10:51 AM||190 mpn
|12791||San Antonio River at US Hwy. 77-A, Goliad, TX||04/17 at 9:06 AM||130 mpn
|14211||Cibolo Creek at CR389 near Cestohowa, TX||04/17 at 10:17 AM||240 mpn
|MPNMost Probable Number (Colonies in 100 ml of water)
NAData is not currently available
The San Antonio River Authority (SARA) has been gathering water quality data in the San Antonio River Basin for approximately 40 years. Currently, SARA collects water quality data at more than 50 locations within the basin, with weekly E. coli bacteria data collection at eight sites along the San Antonio River. The data has established that the most widespread water quality problem within the San Antonio River Basin is high levels of bacteria after rain events.
When rain falls directly on undisturbed natural surfaces, the soils, rocks, plants, and their root systems help 1) to filter out bacteria and pollutants before they reach our rivers, creeks, and streams and 2) to slow down the water as it travels through the basin, reducing the bacteria- and pollution-carrying sediments that are picked up and deposited into our water ways.
However, much of our rain falls on rooftops, streets, sidewalks, and other such surfaces—as well as on farm- and ranch-land where fertilizers, animal feed, and animal wastes are not adequately buffered from our rivers, creeks, and streams. This water, called runoff, carries bacteria and bacteria-promoting materials into our basin’s waterways.
Since this is a common problem in most basins within the state, recreationists who plan to do river-related activities in any basin should research that basin’s bacteria levels before engaging in contact recreation.
To plan for your San Antonio River Basin excursion, click on the line graph links to view a table that reflects the last 10 samples for E. coli bacteria at the eight San Antonio River sites referenced above.
(b) Appropriate uses and criteria for site-specific standards are defined as follows.
(1) Recreation. Recreational use consists of two categories—contact recreation waters and noncontact recreation waters. Classified segments are designated for contact recreation unless elevated concentrations of indicator bacteria frequently occur due to sources of pollution which cannot be reasonably controlled by existing regulations or contact recreation is considered unsafe for other reasons such as ship or barge traffic. In a classified segment where contact recreation is considered unsafe for reasons unrelated to water quality, a designated use of noncontact recreation may be assigned criteria normally associated with contact recreation. A designation of contact recreation is not a guarantee that the water so designated is completely free of disease-causing organisms. Indicator bacteria, although not generally pathogenic, are indicative of potential contamination by feces of warm blooded animals. The criteria for contact recreation are based on these indicator bacteria, rather than direct measurements of pathogens. Criteria are expressed as the number of “colony forming units” of bacteria per 100 milliliters (ml) of water. Even where the concentration of indicator bacteria is less than the criteria for contact recreation, there is still some risk of contracting waterborne diseases. Additional guidelines on minimum data requirements and procedures for evaluating standards attainment are specified in the latest approved version of the TCEQ Guidance for Screening and Assessing Texas Surface and Finished Drinking Water Quality Data.
(i) Contact recreation. The geometric mean of E. coli should not exceed 126 per 100 ml. In addition, single samples of E. coli should not exceed 399 per 100 ml. Contact recreation applies to all bodies of freshwater except where specifically designated otherwise in §307.10 of this title.
Now, the statement by the TCEQ (which comes from the Environmental Protection Agency or EPA) is saying that if you are engaged in contact recreation you have some risk of contracting a waterborne illness (you could get sick). It also states that there is no testing being done that directly measures any disease-causing pathogens (bacteria, viruses, fungus etc.) that can cause waterborne illnesses. The reasons disease-causing pathogens are not measured directly is because there are many different kinds of organisms and they are very hard to measure. So, the next best thing is to measure something else, an “indicator bacteria”, that can be associated with those pathogens. That indicator bacteria is E. coli, an organism found in the feces of all warm-blooded animals. The statement says it’s more likely that pathogens (disease-causing organisms) are going to be present if the indicator bacteria (organisms that are not usually disease-causing) are there. Statistics tell us that if the indicator bacteria are above a certain level there is a better chance that pathogenic organisms will be there. As the number of indicator bacteria go up so does the chance of finding pathogens. However, it also warns that just because the number of indicator bacteria is below the standard it “is not a guarantee that the water so designated is completely free of disease-causing organisms”. Another way to say this is that there can NEVER be a guarantee that anything is completely safe including swimming in crystal clear water with extremely low numbers of indicator bacteria.
While you’re in the basin . . .
If you see something illegal or hazardous dumped in the San Antonio River Basin, first dial 911. Then, be sure to contact the San Antonio River Authority’s Environmental Investigations Coordinator at (210) 227-1373 or, toll free, at (866) 345-7272, and ask for extension 3609.