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Lower Leon Creek: Evaluating Water Quality to Protect Aquatic Life

A completed project to collect dissolved oxygen samples in the stream and add to the data available for evaluating the aquatic life use.
photo of Lower Leon Creek Below the site of Kelly Air Force Base
Leon Creek below the Kelly Air Force Base site

County: Bexar
Parameter: Dissolved Oxygen
RiverBasin: San Antonio
Segment: 1906

Background and Goals

Leon Creek runs from its headwaters in northern Bexar County to its confluence with the Medina River. The creek generally flows south and enters the main portion of Kelly Air Force Base from the northwest, near the intersection of Billy Mitchell Road and Westover Road. Its watershed includes highly urbanized residential areas and the Kelly and Lackland air force bases.

In 2006, TCEQ assessment indicated that low dissolved oxygen concentrations in the creek were not optimal. Oxygen gas, which dissolves in water, is essential for the survival of aquatic life. While the amount of dissolved oxygen in water fluctuates naturally, various human activities can cause chronically low levels of dissolved oxygen.

Staff of this project collected dissolved oxygen samples to update and add to the data available for evaluating the aquatic life use.

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Status

The University of Texas at San Antonio (UTSA), under contract with the TCEQ TMDL Program, collected dissolved oxygen data to update and add to the data sets available for evaluating the aquatic life use. Samples were taken at several stations in portions of the stream segment with few or older data sets. UTSA completed additional data collection in 2014.

Data collected for this project, along with other data routinely collected in the creek, will be evaluated for the 2016 Texas Integrated Report of Surface Water Quality to determine if depressed dissolved oxygen concentrations are still a concern.

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Public Participation

TCEQ staff informed stakeholders about this project by consulting with the San Antonio River Authority, the Clean Rivers Program partner for the basin.

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Contact Us

Please send an e-mail to tmdl@tceq.texas.gov, and mention the Lower Leon Creek aquatic life project in the subject line. Or call us at 512-239-6682.

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