1 Waterbody: MACKENZIE RESERVOIR Watershed : Tule TMDL ID: TX-0228-1998 TMDL Development Priority: LOW Parameter of Concern: TOTAL DISSOLVED SOLIDS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The average level of total dissolved solids in water exceeds the criterion to protect aquatic life, water supply and other water quality uses (L/CN). [top]   2 Waterbody: WHITE RIVER LAKE Watershed : White TMDL ID: TX-1240-1998 TMDL Development Priority: LOW Parameter of Concern: TOTAL DISSOLVED SOLIDS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Average sulfate levels greater than the reservoir criterion to protect aquatic life, water supply, and other water quality uses occur in the Big Sandy Creek arm of the reservoir (L/CN). 1240 White River Lake    L    D  Average total dissolved solid levels exceed the segment criterion to protect aquatic life, water supply, and other water quality uses (L/CN). 1242 Brazos River Below     M D   Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreationin the Whitney Lake     portion of the segment from the City of Marlin to the FM 979 crossing east of Cameron (M/NS). [top]   3 Waterbody: E.V. SPENCE RESERVOIR Watershed : Upper Colorado TMDL ID: TX-1411-1998 TMDL Development Priority: U Parameter of Concern: SULFATE, TOTAL DISSOLVED SOLIDS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Average levels of sulfate and total dissolved solids exceed segment criteria to protect aquatic life, water supply, and other water quality uses (U/CN). Excessive dissolved solids, especially chloride, are attributed to brine seepage from abandonedand improperly capped or cased oil wells located along the Colorado River (Segment 1412) and tributaries immediately downstream from Lake J.B. Thomas. There is a concern for the public water supply use for this segment because the mean sulfate, chloride, and total dissolved solids concentrations exceed the secondary drinking water standard in finished water. Public water supply systems have experienced increased costs for demineralization due to high dissolved solids. A TMDL is scheduled for FY1998. [top]   4 Waterbody: HUBBARD CREEK RESERVOIR Watershed : Hubbard TMDL ID: TX-1233-1998 TMDL Development Priority: LOW Parameter of Concern: SULFATE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). U     Nitrite plus nitrate nitrogen, and ortho- and total phosphorus greater than the screening levels occur in the upper portion of the segment in the area of Highway 6 and the city of Iredale (U). Excessive nutrient levels are occurring in the lower portion near the city of Clifton. The excessive nutrient levels are entering the river from tributary watersheds and are contributing toexcessive plankton growth (U). The Texas Institute for Applied Environmental Research (TIAER) has monitored agricultural nonpoint source runoff since 1991. TIAER, the Brazos River Authority, and the TNRCC are participating in intensive monitoring surveys to determine nonpoint source loading. A TMDL is in preparation for this water body. Local studies will support control programs in the near future. [top]   5 Waterbody: LAKE COMO Watershed : Lower West Fork Trinity TMDL ID: TX-0829-A-1998 TMDL Development Priority: MEDIUM Parameter of Concern : CHLORDANE, DIELDRIN, DDE, PCBS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments : The fish consumption use is not supported through the entire reservoir, based on an aquatic life closure issued by the Texas Department of Health in 1995 due to elevated levels of chlordane, dieldrin, DDE, and PCBs in fish tissue (M/NS). Although the levels of dieldrin alone are not enough to result in an advisory, dieldrin levels in fish tissue contribute to the overall health risk for consumers (M/NS). This water body was listed in 1996 in the description of segment 0829. [top]   6 Waterbody: ECHO LAKE Watershed : Lower West Fork Trinity TMDL ID: TX-0806-B-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PCBS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The fish consumption use is not supported through the entire reservoir, based on an aquatic life closure issued by the Texas Department of Health in 1995 due to elevated levels of PCBs in fish tissue (M/NS). This water body was listed in 1996 in the description of segment 0806. [top]   7 Waterbody: FOSDIC LAKE Watershed : Lower West Fork Trinity TMDL ID: TX-0806-A-1998 TMDL Development Priority: MEDIUM Parameter of Concern : CHLORDANE, DIELDRIN, DDE, PCBS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments : The fish consumption use is not supported through the entire reservoir, based on an aquatic life closure issued by the Texas Department of Health in 1995 due to elevated levels of chlordane, dieldrin, DDE, and PCBs in fish tissue (M/NS). Dieldrinhas not been banned for use, as have the other contaminants found in fish tissue for this water body. Although the levels of dieldrin alone are not enough to result in an advisory, dieldrin levels in fish tissue contribute to the overall health riskfor consumers (M/NS). This water body was listed in 1996 in the description of segment 0806. [top]   8  Waterbody: LAKE LAVON Watershed : East Fork Trinity TMDL ID: TX-0821-1998 TMDL Development Priority: T-M Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   9 Waterbody: BIG CREEK LAKE Watershed : Sulphur Headwaters TMDL ID: TX-0303-A-1998 TMDL Development Priority: T-M Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   10 Waterbody: LAKE TAWAKONI Watershed : Upper Sabine TMDL ID: TX-0507-1998 TMDL Development Priority: T-M Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   11 Waterbody: MOUNTAIN CREEK LAKE Watershed : Lower West Fork Trinity TMDL ID: TX-0841-A-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PCBS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The fish consumption use is not supported through the entire reservoir, based on an aquatic life closure issued by the Texas Department of Health in 1996 due to elevated levels of PCBs in fish tissue (M/NS). This water body was listed in 1996 in thedescription of segment 0841. [top]   12 Waterbody: JOE POOL LAKE Watershed : Lower West Fork Trinity TMDL ID: TX-0838-1998 TMDL Development Priority: T-H Parameter of Concern : SULFATE, TOTAL DISSOLVED SOLIDS, ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Average sulfate and total dissolved solids concentrations exceed segment criteria to protect aquatic life, water supply, and other water quality uses throughout the reservoir (L/CN). All water quality measurements currently support use as a publicwater supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-h). [top]   13 Waterbody: LAKE WAXAHACHIE Watershed : Chambers TMDL ID: TX-0816-1998 TMDL Development Priority: T-M Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   14 Waterbody: BARDWELL RESERVOIR Watershed : Chambers TMDL ID: TX-0815-1998 TMDL Development Priority: T-H Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-h). [top] | 15 Waterbody: WRIGHT PATMAN LAKE Watershed : Lower Sulphur TMDL ID: TX-0302-1998 TMDL Development Priority: MEDIUM Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Dissolved oxygen concentrations are sometimes lower than the standard established to assure optimum habitat conditions for aquatic life near the dam and in the upper end of the reservoir around State Highway 8 (M/ NS). [top]   16 Waterbody: CADDO LAKE Watershed: Caddo Lake TMDL ID: TX-0401-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY, PH, THERMAL MODIFICATIONS, ZINC Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: A restricted consumption advisory for the general population, children, and women of child bearing age was issued by the Texas Department of Health in November of 1995 for Caddo Lake due to elevated levels of mercury in fish tissue (M/NS). Largemouth bass [top]   17 Waterbody: LAKE O`THE PINES Watershed : Lake O'the Pines TMDL ID: TX-0403-1998 TMDL Development Priority: U Parameter of Concern: ZINC Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Concentrations of dissolved zinc in water occasionally exceed the criterion established to protect aquatic life in approximately ½ of the reservoir extending upstream from the dam (U/PS). A TMDL project is scheduled to begin in FY 1998. [top]   18 Waterbody: TOLEDO BEND RESERVOIR Watershed : Toledo Bend Reservoir TMDL ID: TX-0504-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Due to mercury in fish tissue, the Texas Department of Health issued restricted consumption advisories in November 1995 for the general population, children, and women of child bearing age (M/NS). [top]   19 Waterbody: SAM RAYBURN RESERVOIR Watershed : Lower Angelina TMDL ID: TX-0610-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY, ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Due to mercury in fish tissue, the Texas Department of Health issued restricted consumption advisories in November 1995 for the general population, children, and women of child bearing age (M/NS). A project to address mercury is underway. In theupper portion of the reservoir, dissolved oxygen concentrations are sometimes lower than the standard established to assure optimum habitat conditions for aquatic life (M/NS), and bacteria levels sometimes exceed the criterion established to assurethe safety of contact recreation (M/NS). [top]   20 Waterbody: RICHLAND-CHAMBERS RESERVOIR Watershed : Richland TMDL ID: TX-0836-1998 TMDL Development Priority: T-M Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine     concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   21 Waterbody: AQUILLA LAKE Watershed : Middle Brazos-Lake Whitney TMDL ID: TX-1254-1998 TMDL Development Priority: HIGH Parameter of Concern: ATRAZINE, ALACHLOR Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Atrazine concentrations in finished drinking water violate the Maximum Contaminant Level for primary drinking water standards (H/NS). Origin of the contamination is source water and represents a failure of the water body to support the public water supply use. Alachlor concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-m). [top]   22 Waterbody: MARLIN CITY LAKE SYSTEM Watershed : Lower Brazos-Little Brazos TMDL ID: TX-1242-A-1998 TMDL Development Priority: T-H Parameter of Concern: ATRAZINE Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: All water quality measurements currently support use as a public water supply; however, atrazine concentrations in finished drinking water indicate contamination of source water and represent a threat to future use (T-h). The lake system includes Old Marlin City Lake and New Marlin Reservoir. [top]   23 Waterbody: LAKE LIVINGSTON Watershed : Lower Trinity-Kickapoo TMDL ID: TX-0803-1998 TMDL Development Priority: MEDIUM Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PH Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Dissolved oxygen concentrations are sometimes lower than the standard established to assure optimum habitat conditions for aquatic life (M/NS). Measured pH values in water are sometimes higher than the segment criterion to protect aquatic life and other water quality uses (L/CN). [top]   24 Waterbody: B.A. STEINHAGEN RESERVOIR Watershed : Lower Neches TMDL ID: TX-0603-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Due to mercury in fish tissue, the Texas Department of Health issued restricted consumption advisories in    November 1995 for the general population, children, and women of child bearing age (M/NS). [top]   25 Waterbody: LAKE CONROE Watershed : West Fork San Jacinto TMDL ID: TX-1012-1998 TMDL Development Priority: T-M Parameter of Concern: MERCURY Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The average mercury concentration in water exceeded the human health criterion for freshwater fish (T-m/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish tissue. However, samples of fish do notindicate that this mercury is accumulating in fish tissue. A Texas Department of Health analysis of fish tissue data concluded that there is no additional health risk from the consumption of fish. Mercury does not exceed primary or secondary drinkingwater standards. [top]   26 Waterbody: LAKE HOUSTON Watershed : West Fork San Jacinto TMDL ID: TX-1002-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The average mercury concentration in water exceeded the human health criterion for freshwater fish (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish tissue. Risk of exposure to mercury from fish consumption has not been assessed. [top]   27 Waterbody: CEDAR LAKES Watershed : East Matagorda Bay TMDL ID: TX-2442-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Based on Texas Department of Health shellfish maps, the entire area does not support the oyster water use (L/NS). Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   28 Waterbody: LAKE AUSTIN Watershed : Austin-Travis Lakes TMDL ID: TX-1403-1998 TMDL Development Priority: LOW Parameter of Concern : ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Dissolved oxygen concentrations are occasionally below the standard established to assure optimum habitat conditions for aquatic life, in the first few miles below Lake Travis (L/PS).  This segment receives low-oxygen bottom water from Lake Travis during the summer months. [top]   29 Waterbody: TOWN LAKE Watershed : Austin-Travis Lakes TMDL ID: TX-1429-1998 TMDL Development Priority: MEDIUM Parameter of Concern: CHLORDANE, PATHOGENS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Fish and sediments collected from Town Lake have elevated levels of chlordane (M/NS). The Texas Department of Health has issued a restricted consumption advisory for the general population. Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). Nonpoint source pollution demonstration projects have been implemented by the City of Austin. [top]   30 Waterbody: CHOKE CANYON RESERVOIR Watershed : Lower Frio TMDL ID: TX-2116-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation in the upper portion of the reservoir (M/NS). [top]

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