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Arroyo Colorado Watershed Protection Plan Update

A project to learn more about the causes of varying levels of dissolved oxygen in the Arroyo Colorado’s tidal segment using a dissolved oxygen dynamics model. This model helped identify options for improving the dissolved oxygen levels, which were incorporated into an update to the Arroyo Colorado WPP.


The Arroyo Colorado Tidal sometimes experiences periods of low dissolved oxygen, which can result in adverse wildlife habitat conditions and sometimes in fish kills. All of the state's assessments since 1996 have classified this segment as impaired for low dissolved oxygen.

To restore water quality, the Arroyo Colorado Watershed Partnership developed the Arroyo Colorado Watershed Protection Plan (WPP)Exit the TCEQ in 2007. Implementation o the plan has been ongoing since then.

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Project Description

This project supplemented the existing Soil and Watershed Assessment Tool model for the segment with a receiving water model to simulate the dissolved oxygen dynamics in this tidal environment. The model evaluated the potential effects of a variety of proposed management measures.

The Arroyo Colorado Partnership reviewed the results of the model simulations, proposed alternative scenarios to simulate achievement of the DO standard, and incorporated the results and proposals into an updated WPP document.

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For More Information

To find out more about the NPS Program, call 512-239-6682 or e-mail us at

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