Austin Reservoir 2004 Survey Report media download(PDF 348.6 KB)

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Austin Reservoir - 2004 Survey Report

Prepared by Stephan J. Magnelia and C. Craig Bonds
Inland Fisheries Division
District 2-C, San Marcos, Texas

This is the authors' summary from a 20-page report. For a copy of the complete report, use the download link in the sidebar.

Austin Reservoir was surveyed in 2004 and 2005 using gill netting, trap netting and electrofishing. Access and habitat surveys were completed in 2004. The 2004-2005 catch-perunit-effort (CPUE) for species in this summary was compared with CPUE collected in previous Austin Reservoir surveys. This report summarizes the results of those surveys and contains a fisheries management plan for the reservoir based on those findings.

Reservoir Description

Austin Reservoir is a stable level 1,599 acre riverine type impoundment of the Colorado River located in the heart of the City of Austin (COA). It was constructed in 1893 for purposes of hydro-electric power, municipal water supply, water conservation and recreation. The reservoir is used to pass water from Travis Reservoir downstream. The reservoir is operated by the Lower Colorado River Authority (LCRA) and COA. The reservoir lies within the Edwards Plateau vegetational area and has a drainage area of approximately 38,240 square miles. Land surrounding the reservoir is highly developed with commercial and residential property bordering most of the shoreline.

Aquatic Vegetation Management

Aquatic vegetation management has been a part of the Austin Reservoir ecosystem for over fifty years. A history of aquatic vegetation management efforts through 2000 are found in Tennant and Magnelia (2001). The reservoir has been drawn down 12 feet annually from December to February since 2001 in an attempt to control aquatic vegetation. In 2003 and 2004 triploid grass carp (8,125) were stocked as part of a plan to control hydrilla (Hydrilla verticullata). The effects of these control measures on total aquatic vegetation and hydrilla coverage are currently being assessed.

Fish Community

Management Strategies

Aquatic vegetation coverage in the 10-40% range will be important for maintaining the quality largemouth bass fishery that currently exists. Aquatic vegetation coverage will be evaluated at least annually. This reservoir has been designated a trophy bass fishery. Florida bass stocking will be recommended when the percentage of pure Florida bass in the population falls below 20%.

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Performance Report as required by Federal Aid in Sport Fish Restoration Act Texas Federal Aid Project F-30-R-29 Statewide Freshwater Fisheries Monitoring and Management Program

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