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Arroyo Colorado: Improving the McAllen Stormwater Facilities

A project to install and monitor improvements at three regional stormwater detention facilities (RSDFs) in the City of McAllen


The Arroyo Colorado flows through Hidalgo, Cameron, and Willacy counties in the Lower Rio Grande Valley and into the Laguna Madre. The Valley region has one of the fastest growing populations in the nation. As a result of low levels of dissolved oxygen, the tidal segment of the Arroyo Colorado (2201) does not currently meet water quality standards for support of fish and other aquatic life. There have also been concerns about high nutrient levels in the arroyo. In response, the Arroyo Colorado Watershed Partnership was formed, and completed its WPP in 2007.

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Project Description

Texas A&M University–Kingsville is implementing part of the WPP by installing and monitoring several enhancement features—wetlands, biofilters, and a microscreen filter—at three RSDFs in McAllen. The TCEQ expects that the improvements to the facilities will result in better water quality in the Arroyo Colorado.

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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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