Skip to Content
Questions or Comments:

Lower Leon Creek: Aquatic Life

This completed project collected dissolved oxygen samples in Lower Leon Creek and added to the data available for evaluating the aquatic life use.
photo of Lower Leon Creek
Leon Creek below the Kelly Air Force Base site

County: Bexar
Parameter: Dissolved Oxygen
River Basin: San Antonio
Segment: 1906

On this page:

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 for aquatic life. 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.

The goal of this project was to collect additional dissolved oxygen samples to update and add to the data available for evaluating attainment of the aquatic life use of the creek.

Back to the top of the page Back to top


The University of Texas at San Antonio (UTSA), under contract with the TMDL Program, collected dissolved oxygen data at several stations in on the stream segment that had few samples or older data sets. UTSA completed additional data collection in 2014. The impairment of the aquatic life use for the creek was subsequently removed from the state's list of impaired waters in 2016. 

Back to the top of the page Back to top

Public Participation

TCEQ staff informed stakeholders about this project through the San Antonio River Authority, which is the Texas Clean Rivers Program partner for the basin.

Back to the top of the page Back to top

Contact the TMDL Program

Please email and mention the Lower Leon Creek aquatic life project in the subject line. Or call us at 512-239-6682.

Back to the top of the page Back to top

Communities Working Together