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H-4 (Gonzales) Reservoir 2007 Survey Report media download(PDF 466.1 KB)

If you have difficulty accessing the information in this document, contact the TPWD Inland Fisheries Division for assistance.


H-4 (Gonzales) Reservoir - 2007 Survey Report

Prepared by John Findeisen and Greg Binion
Inland Fisheries Division
District 1-E, Mathis, Texas

This is the authors' summary from a 23-page report. For a copy of the complete report, use the download link in the sidebar.

H-4 Reservoir was surveyed in the fall 2007 using trap nets and electrofishing and in the spring 2008 using gill nets. This report summarizes the results of the surveys and contains a management plan for the reservoir based on those findings.

Reservoir Description

H-4 is a 696-acre reservoir on the Guadalupe River in Gonzales County and is controlled by the Guadalupe-Blanco River Authority (GBRA). The reservoir was impounded in 1931 to provide water for a hydroelectric plant and recreational uses. The substrate is composed primarily of silt, sand, clay, and some gravel and rock. Angler and boat access was limited to only one pay-to-use boat ramp. There were no handicap specific facilities. At the time of sampling, the habitat was composed of boat docks, stumps, floating-leaved vegetation, limited submersed and emergent vegetation, and water hyacinth.

Management History

Important sport fish species include channel catfish, largemouth bass, and crappie. Anglers have reported catching white, palmetto and striped bass from this reservoir but these species were not collected in gill net surveys. Palmetto and striped bass migrate downstream from a stocked upstream reservoir (Canyon Lake). Flathead catfish were present in the reservoir and blue catfish have been stocked in this reservoir but have yet to become the dominant catfish species as seen in other reservoirs throughout Texas. The 2004 management plan focused on working with GBRA on constructing a new boat ramp and increasing bank access and monitoring nuisance aquatic vegetation. The GBRA does not own enough land surrounding the reservoir to construct a new boat ramp and increase bank access. The GBRA contracted a certified commercial applicator to conduct herbicide treatments, specifically for water hyacinth, since the last report. Beginning in 2007 GBRA and TPWD started working cooperatively towards a better focused control of water hyacinth. A nuisance aquatic management plan was drafted in January 2008. Hydrilla, once present in the reservoir, was last observed in 2004.

Fish Community

Management Strategies

Sport Fish Restoration Logo

Performance Report as required by Federal Aid in Sport Fish Restoration Act Texas Federal Aid Project F-30-R-33 Statewide Freshwater Fisheries Monitoring and Management Program

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