Arroyo Colorado: A Watershed Protection Plan
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Laguna Atascosa
near the mouth of the Arroyo Colorado
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Counties: Cameron, Hidalgo, Willacy
Parameter: Dissolved oxygen
Basin: Nueces–Rio Grande Coastal Basin
Segment: 2201
- Watershed Protection Plan Project Overview (PDF)
- Background and Goals
- Public Meetings and Participation
- Watershed Plans
- For More Information
Background and Goals
The Arroyo Colorado, an ancient distributary channel of the Rio Grande, extends 90 miles from Mission, Texas to the Laguna Madre in the Rio Grande Valley. Water quality analyses show that dissolved oxygen concentrations in the Arroyo are not optimal for the support of fish and other aquatic life. The goal of the project is to restore the quality of the Arroyo to conditions that will support a healthy aquatic community.
In July 2002, the TCEQ initiated a project with area stakeholders to develop a watershed protection plan (WPP). Results of a TMDL analysis developed in 2002 by the TCEQ indicated that the dissolved oxygen problem in the tidal segment is related as much to the physical setting and geomorphology of the Arroyo Colorado as it is to the loading of nutrients and oxygen-demanding substances from the non-tidal segment.
To support the WPP, the TCEQ is refining the draft TMDL for dissolved oxgyen. An overview of the original project provides highlights about the development of the initial draft TMDL.
Public Meetings and Participation
A steering committee, which is no longer active, was established to advise the TCEQ on the original project to develop a TMDL for dissolved oxygen. The steering committee established five work groups to address key elements of the plan.
Stakeholders in the area then established the independent Arroyo Colorado Watershed Partnership 
to direct the development and implementation of the WPP. Find out more about meetings and membership of the Arroyo Colorado Watershed Partnership its work groups.
Watershed Plans
The Watershed Protection Plan was developed by the region's stakeholders in partnership with several state and federal agencies.
- Watershed Protection Plan, Phase I, Final Jan. 11, 2007 (12 MB)
- WPP Executive Summary, Phase I, Final Jan. 11, 2007
The Pollutant Reduction Plan describes the regulatory and voluntary measures in effect and planned for the next ten years to reduce the pollutant loadings from sanitary wastewater flowing into the Arroyo Colorado.
For More Information
Please e-mail us at tmdl@tceq.texas.gov and reference the Arroyo Colorado in the subject line. Or call Roger Miranda, Project Manager, at 512/239-6278.
