GBRA to Begin Treatments for Hyacinth at H-4

Posted: July 19, 2016

For more information
LaMarriol Smith, 830-379-5822,

SEGUIN – On Wednesday, July 20, 2016, the first of a series of herbicide applications will be applied to control the aquatic plant hyacinth at H-4 (Lake Gonzales) as part of the GBRA Aquatic Vegetation Monitoring Program. Hyacinth is a bulbous flowering aquatic plant growing in abundance in the Guadalupe River. It is easily spread by clippings that break loose and float downstream or by attaching to boat propellers. The overabundance of hyacinth, particularly along banks and in low-flow areas of the lake, creates a hindrance for boat traffic and recreational use of the water. The aquatic herbicide glyphosate, which is approved for aquatic use by the U.S. Environmental Protection Agency, will be sprayed across about 84 acres of the lake where large amounts of the hyacinth have taken over.

“Weather permitting, the first treatment of the water hyacinth should be complete by the weekend. We expect to repeat the application two more times during July and August,” Mike Urrutia, GBRA director of Water Quality, said. “It will take several weeks to see the impact of the treatments,” he added.

The application of this herbicide complies with policy guidelines adopted by GBRA’s Board of Directors governing the treatment of nuisance aquatic vegetation in lakes and reservoirs operated by GBRA. The treatment proposal has been submitted to and will be directed under the supervision of the Texas Parks and Wildlife Department (TPWD), in compliance with the Statewide Vegetation Management Plan.

There are no restrictions on water use during the application period.

Additional information about the Lake Gonzales area treatments and the Statewide Vegetation Management Plans are available at the GBRA General Office, 933 East Court Street in Seguin.

The GBRA is a recognized leader in managing water resources that benefit both people and the environment. GBRA provides stewardship for the water resources in its 10-county statutory district, which includes Kendall, Comal, Hays, Caldwell, Guadalupe, Gonzales, DeWitt, Victoria, Calhoun and Refugio counties.





© 1998 Guadalupe-Blanco River Authority

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