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2008 Basin Summary Report San Antonio-Nueces Coastal Basin Nueces River Basin Nueces-Rio Grande Coastal Basin

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2008 Basin Summary Report San Antonio-Nueces Coastal Basin Nueces River Basin Nueces-Rio Grande Coastal Basin 2008 Basin Summary Report San Antonio-Nueces Coastal Basin Nueces River Basin Nueces-Rio Grande Coastal Basin August 2008 Prepared in cooperation with the Texas Commission on Environmental Quality Clean Rivers Program Table of Contents List of Acronyms ................................................................................................................................................... ii Executive Summary ............................................................................................................................................. 1 Significant Findings ......................................................................................................................................... 1 Recommendations .......................................................................................................................................... 4 1.0 Introduction ................................................................................................................................................... 5 2.0 Public Involvement ....................................................................................................................................... 6 Public Outreach .............................................................................................................................................. 6 3.0 Water Quality Reviews .................................................................................................................................. 8 3.1 Water Quality Terminology ....................................................................................................................... 8 3.2 Data Review Methodology ....................................................................................................................... 9 3.3 Watershed Summaries ........................................................................................................................... 11 San Antonio – Nueces Coastal Basin ....................................................................................................... 11 Segment 2001, Mission River Tidal ....................................................................................................... 11 Segment 2002, Mission River Above Tidal ............................................................................................ 12 Segment 2003, Aransas River Tidal ...................................................................................................... 14 Segment 2004, Aransas River Above Tidal ........................................................................................... 15 Nueces River Basin .................................................................................................................................... 18 Segment 2101, Nueces River Tidal ....................................................................................................... 18 Segment 2102, Nueces River Below Lake Corpus Christi ..................................................................... 20 Segment 2103, Lake Corpus Christi ...................................................................................................... 24 Segment 2104, Nueces River Above Frio River .................................................................................... 30 Segment 2105, Nueces River Above Holland Dam ............................................................................... 33 Segment 2106, Nueces River / LowerFrio River .................................................................................... 36 Segment 2107, Atascosa River ............................................................................................................. 39 Segment 2108, San Miguel Creek ......................................................................................................... 44 Segment 2109, Leona River .................................................................................................................. 46 Segment 2110, Lower Sabinal River ...................................................................................................... 50 Segment 2111, Upper Sabinal River ...................................................................................................... 51 Segment 2112, Upper Nueces River ..................................................................................................... 52 Segment 2113, Upper Frio River ........................................................................................................... 56 Segment 2114, Hondo Creek ................................................................................................................ 58 Segment 2115, Seco Creek ................................................................................................................... 61 Segment 2116, Choke Canyon Reservoir .............................................................................................. 62 Segment 2117, Frio River Above Choke Canyon Reservoir .................................................................. 66 Nueces – Rio Grande Coastal Basin ......................................................................................................... 72 Segment 2201, Arroyo Colorado Tidal ................................................................................................... 72 Segment 2202, Arroyo Colorado Above Tidal ........................................................................................ 81 Segment 2203, Petronila Creek Tidal .................................................................................................... 90 Segment 2204, Petronila Creek Above Tidal ......................................................................................... 91 Segment 2485A, Oso Creek .................................................................................................................. 93 Segment 2492A, San Fernando Creek .................................................................................................. 96 Bays, Estuaries, and Gulf of Mexico ......................................................................................................... 99 Segment 2462, San Antonio Bay / Hynes Bay ..................................................................................... 100 Segment 2463, Mesquite Bay .............................................................................................................. 101 Segment 2471, Aransas Bay ............................................................................................................... 102 Segment 2472, Copano Bay ................................................................................................................ 105 Segment 2473, St Charles Bay ............................................................................................................ 110 Segment 2481, Corpus Christi Bay ...................................................................................................... 111 Segment 2482, Nueces Bay ................................................................................................................ 115 Segment 2483, Redfish Bay ................................................................................................................ 117 Segment 2483A, Conn Brown Harbor ................................................................................................. 119 Segment 2484, Corpus Christi Inner Harbor ........................................................................................ 120 Segment 2485, Oso Bay ...................................................................................................................... 122 Segment 2491, Laguna Madre ............................................................................................................ 126 Segment 2492, Baffin Bay ................................................................................................................... 134 Segment 2493, South Bay ................................................................................................................... 138 Segment 2494, Brownsville Ship Channel ........................................................................................... 139 Segment 2494A, Port Isabel Fishing Harbor ........................................................................................ 141 Segment 2501, Gulf of Mexico ............................................................................................................. 142 4.0 Recommendations and Conclusions ...................................................................................................... 144 Contact Information ......................................................................................................................................... 144 i List of Acronyms AU Assessment Unit BST Bacteria Source Tracking cfs Cubic Feet per Second cfu Colony Forming Units CM Channel Marker CR County Road CRP Clean Rivers Program CV Criteria Value DDE Dichlorodiphenylethylene DO Dissolved Oxygen DSHS Department of State Health Services FM Farm to Market gpd Gallons Per Day Hr Hour ICWW Intracoastal Waterway km Kilometers LP Limited Partnership m Meters mg/l Milligrams Per Liter MUD Municipal Utility District N+N Nitrite+Nitrate NAS Naval Air Station NPS Nonpoint Source NRA Nueces River Authority OP Orthophosphorus PCB Polychorinated byphenyl RRC Railroad Commission SH State Highway
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