1 Waterbody: ADAMS BAYOU TIDAL Watershed : Lower Sabine TMDL ID: TX-0508-1998 TMDL Development Priority: LOW Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PATHOGENS 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 (L/NS), and bacterial levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). [top]   2 Waterbody: HELLEBRANDT BAYOU Watershed : Sabine Lake TMDL ID: TX-0704-1998 TMDL Development Priority: LOW 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 occasionally lower than the standard established to assure optimum habitat conditions for aquatic life (L/PS). Measured pH values exceed the segment criterion to protect aquatic life and other water quality uses(L/CN). [top]   3 Waterbody: TAYLOR BAYOU ABOVE TIDAL Watershed : Sabine Lake TMDL ID: TX-0701-1998 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 lower than the standard established to assure optimum habitat conditions for aquatic life in the lower 25 miles of the segment (L/PS). [top]   4 Waterbody: ALLIGATOR BAYOU Watershed : Sabine Lake TMDL ID: TX-0702-A-1998 TMDL Development Priority: LOW Parameter of Concern: SULFATES Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The water body does not support the designated intermediate aquatic life use as a result of significant effects in ambient toxicity tests (L/NS). The water body does not meet the segment criterion for sulfates to protect aquatic life, water supply,and other water quality uses (L/CN). Alligator Bayou is effectively isolated from tidal influence by a hurricane barrier. Criteria for segment 0701, Taylor Bayou Above Tidal, were used as screening criteria for this water body. [top]   5 Waterbody: CEDAR BAYOU TIDAL Watershed : North Galveston Bay TMDL ID: TX-0901-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation in the lower 19 miles of the segment (M/NS). [top]   6 Waterbody: TABBS BAY Watershed : North Galveston Bay TMDL ID: TX-2426-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). The fish consumption use is not supported through the entire segment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   7 Waterbody: SAN JACINTO BAY Watershed : Buffalo-San Jacinto TMDL ID: TX-2427-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The fish consumption use is not supported through the entire segment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   8 Waterbody: BLACK DUCK BAY Watershed : North Galveston Bay TMDL ID: TX-2428-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The fish consumption use is not supported through the entire segment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   9 Waterbody: SCOTT BAY Watershed : Buffalo-San Jacinto TMDL ID: TX-2429-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS, DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). Municipal wastewater discharges are a probable contributor to this condition. The fish consumption use is not supported through the entiresegment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   10 Waterbody: BURNETT BAY Watershed : Buffalo-San Jacinto TMDL ID: TX-2430-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The fish consumption use is not supported through the entire segment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   11 Waterbody: SAN JACINTO RIVER TIDAL Watershed : Buffalo-San Jacinto TMDL ID: TX-1001-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration in water exceeded the human health criterion for saltwater fish (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish tissue. Risk of exposure to mercury from fishconsumption has not been assessed. Bacteria levels sometimes exceed the criterion established to assure the safety of  contact recreation (L/NS). [top]   12 Waterbody : HOUSTON SHIP CHANNEL/SAN JACINTO RIVER TIDAL Watershed: Buffalo-San Jacinto TMDL ID: TX-1005-1998 TMDL Development Priority: M/U Parameter of Concern: MERCURY, DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration in water exceeded the human health criterion for saltwater 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. A restricted-consumption advisory for the general population and a no-consumption advisory for children and women of childbearing age were issued by the Texas Department of Health due to elevated levels ofdioxin in blue crabs and catfish (M/NS).A TMDL for nickel [listed in the 1996 303(d) list] is in preparation for this water body. [top]   13 Waterbody: HOUSTON SHIP CHANNEL TIDAL Watershed : Buffalo-San Jacinto TMDL ID: TX-1006-1998 TMDL Development Priority: M/U Parameter of Concern: MERCURY, DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration in water exceeded the human health criterion for saltwater 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. A restricted-consumption advisory for the general population and a no-consumption advisory for children and women of childbearing age were issued by the Texas Department of Health due to elevated levels of dioxin in blue crabs and catfish (M/NS). A TMDL for nickel [listed in the 1996 303(d) list] is in preparation for this water body. [top]   14 Waterbody: PATRICK BAYOU Watershed : Buffalo-San Jacinto TMDL ID: TX-1006-A-1998 TMDL Development Priority: HIGH Parameter of Concern: COPPER, UNKNOWN TOXICITY, THERMAL MODIFICATIONS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Dissolved copper concentrations in water sometimes exceed the chronic criterion to protect aquatic life (H/NS). Ambient water toxicity sometimes exceeds the screening levels established to provide optimum habitat conditions for aquatic life (H/CN). [top]   15 Waterbody: HOUSTON SHIP CHANNEL/ BUFFALO BAYOU TIDAL Watershed: Buffalo-San Jacinto TMDL ID: TX-1007-1998 TMDL Development Priority: M/U Parameter of Concern: MERCURY, DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration in water exceeded the human health criterion for saltwater fish (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish tissue. Risk of     exposure to mercuryfrom fish consumption has not been assessed. A restricted-consumption advisory for the general population and a no-consumption advisory for children and women of childbearing age were issued by the Texas Department of Health due to elevated levels ofdioxin in blue crabs and catfish (M/NS). A TMDL for nickel [listed in the 1996 303(d) list] is in preparation for this water body. [top]   16 Waterbody: VINCE BAYOU Watershed : Buffalo-San Jacinto TMDL ID: TX-1007-A-1998 TMDL Development Priority: MEDIUM Parameter of Concern: SEDIMENT, TOXICITY, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Ambient sediment toxicity occasionally exceeds the levels established to provide optimum habitat conditions for aquatic life (M/CP). Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (M/NS). [top]   17 Waterbody: BUFFALO BAYOU TIDAL Watershed : Buffalo-San Jacinto TMDL ID: TX-1013-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS, COPPER, 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 saltwater 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. Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). Mean copper concentration in water exceeded the criterion established to protect aquatic life from chronicexposure (M/NS). [top]   18 Waterbody: CLEAR CREEK TIDAL Watershed : West Galveston Bay TMDL ID: TX-1101-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS, DICHLOROETHANE, TRICHLOROETHANE, CARBON DISULFIDE, CHLORDANE Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (M/NS).A no-consumption advisory was issued by the Texas Department of Health in 1993 for Clear Creek (L/NS). The advisory applies to an 8.3 mile portion upstream of SH 3 in Clear Creek Tidal, and warns against consumption of any fish and blue crabs taken from the affected area. Test results reveal dichloroethane, trichloroethane, carbon disulfide, and chlordane in fish and crab tissues. Management strategies are in place for industrial contaminants. [top]   19 Waterbody: CLEAR CREEK ABOVE TIDAL Watershed: West Galveston Bay TMDL ID: TX-1102-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS, DICHLOROETHANE, TRICHLOROETHANE, CARBON DISULFIDE, CHLORDANE Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation in the lower 25 miles of the segment (L/NS). A no-consumption advisory was issued for the general population by the Texas Department of Health inNovember 1993 for Clear Creek (L/NS). The advisory applies to all of Clear Creek Above Tidal, and warns against consumption of any fish or blue crabs taken from the affected area. Test results reveal dichloroethane, trichloroethane, carbon disulfide, and chlordane in fish and crab tissues. Management strategies are in place for industrial contaminants. [top]   20 Waterbody: DICKINSON BAYOU TIDAL Watershed : West Galveston Bay TMDL ID: TX-1103-1998 TMDL Development Priority: M/U Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (M/NS). Dissolved oxygen concentrations are occasionally below the standard established to assure optimum habitat conditions for aquatic life, from IH-45 southeast of Dickinson downstream to one-half mile upstream of SH 6 (U/PS). A TMDL for dissolved oxygen is in preparation for this water body. [top]   21 Waterbody: ARMAND BAYOU TIDAL Watershed : West Galveston Bay TMDL ID: TX-1113-1998 TMDL Development Priority: M/U Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Dissolved oxygen concentrations are sometimes below the standard established to assure optimum habitat conditions for aquatic life, in the upper two miles of the segment (U/NS). These low dissolved oxygen levels may be due to natural conditions associated with poor flushing capability and high sediment oxygen demand. Bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (M/NS). A TMDL to address low dissolved oxygen levels is in preparation for this water body. [top]   22 Waterbody: UPPER GALVESTON BAY Watershed : North Galveston Bay TMDL ID: TX-2421-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The fish consumption use was not supported in the 22 square miles (mi) from Red Bluff Point to Five Mile Cut Marker to Houston Point, north to Morgan's Point. A restricted-consumption advisory for the general population and a no-consumption advisoryfor children and women of childbearing age were issued by the Texas Department of Health due to elevated levels of dioxin in blue crabs and catfish (M/NS). Based on Texas Department of Health shellfish maps,55% of the bay (59.5 mi of the outer perimeter) does not support and 19% of the bay (20.6 mi of the area adjacent to the nonsupporting area) partially supports the oyster water use (L/NS/PS). The remaining 26% (40.6 mi) fully supports the oyster water use. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential water quality concerns. [top]   23 Waterbody: TRINITY BAY Watershed : Lower Trinity TMDL ID: TX-2422-1998 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 saltwater fish in eight square miles north of Exxon C-1 platform (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fishtissue. Risk of exposure to mercury from fish consumption has not been assessed. Based on Texas Department of Health shellfish maps, 69.3% of the bay (90.2 mi of the outer perimeter) does not support and 13.8% of the bay (17.9 mi of the area adjacent to the nonsupporting area) partially supports the oyster water use (L/NS/PS). The remaining 16.9% (22 mi) fully supports the oyster water use. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish.Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential water quality concerns. [top]   24 Waterbody: EAST BAY Watershed : East Galveston Bay TMDL ID: TX-2423-1998 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 saltwater fish in eight square miles between Marsh and Elm Grove Points (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicantsin fish tissue. Risk of exposure to mercury from fish consumption has not been assessed. Based on Texas Department of Health shellfish maps, 22.1% of the bay (11.5 mi at the east end of the bay near East Bay Bayou and Intracoastal Waterway) does notsupport (L/NS) and 77.9% of the bay (the remaining 40.6 mi) fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   25 Waterbody: LOWER GALVESTON BAY Watershed : East Galveston Bay TMDL ID: TX-2439-1998 TMDL Development Priority: MEDIUM Parameter of Concern: COPPER, PATHOGENS, MERCURY Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration exceeded the human health criterion for saltwater fish in 16 square miles near Redfish Island and the Galveston Channel-FLR 2 (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. The mean dissolved copper concentration in water exceeds the criterion established to protect aquatic life from chronic exposure (M/NS). Based on Texas Department of Health shellfish maps, 43.5% of the bay (60.7 mi of the outer perimeter, Galveston and Texas City) does not support and 9.9% of the bay (13.8 mi of the area adjacent to the nonsupporting area) partially supports the oyster water use (L/NS/PS). The remaining 46.6% (65 mi) fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. [top]   26 Waterbody: BARBOURS CUT Watershed : Buffalo-San Jacinto TMDL ID: TX-2436-1998 TMDL Development Priority: MEDIUM Parameter of Concern: DIOXIN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The fish consumption use is not supported through the entire segment, based on a fish consumption advisory issued by the Texas Department of Health in 1990 due to elevated levels of dioxin in fish and crab tissue (M/NS). [top]   27 Waterbody: TEXAS CITY SHIP CHANNEL Watershed : West Galveston Bay TMDL ID: TX-2437-1998 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 (L/PS). [top]   28 Waterbody: WEST BAY Watershed : West Galveston Bay TMDL ID: TX-2424-1998 TMDL Development Priority: MEDIUM Parameter of Concern: COPPER, PATHOGENS, 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 saltwater fish in eight square miles near Carancahua Reef (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish. Riskof exposure to mercury from fish consumption has not been assessed. Due to elevated mercury (chronic) and copper (chronic) in water, the high aquatic life use was not supported in eight square miles of the bay near Carancahua Reef (M/NS). Based on Texas Department of Health shellfish maps, 35.2% of the bay (24.4 mi at the east end near the Galveston and Texas City) does not support (L/NS) and 64.8% of the bay (the remaining 44.9 mi) fully supports the oyster water use.Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   29 Waterbody: CHOCOLATE BAY Watershed : West Galveston Bay TMDL ID: TX-2432-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, the entire bay 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]   30 Waterbody: OYSTER CREEK TIDAL Watershed : Austin-Oyster TMDL ID: TX-1109-1998 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 (M/NS). [top]   31 Waterbody: OLD BRAZOS RIVER CHANNEL TIDAL Watershed: Austin-Oyster TMDL ID: TX-1111-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The average mercury concentration in water exceeded the human health criterion for saltwater fish (M/NS). This criterion was established to protect consumers from bioaccumulation of toxicants in fish tissue. Risk of exposure to mercury fromfish consumption has not been assessed. [top]   32 Waterbody: SAN BERNARD RIVER TIDAL Watershed : San Bernard TMDL ID: TX-1301-1998 TMDL Development Priority: MEDIUM Parameter of Concern: ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN, PATHOGENS Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: Dissolved oxygen concentrations are occasionally below the standard established to assure optimum habitat conditions for aquatic life (M/PS), and bacteria levels sometimes exceed the criterion established to assure the safety of contact recreation (L/NS). [top]   33 Waterbody: CANEY CREEK TIDAL Watershed : East Matagorda Bay TMDL ID: TX-1304-1998 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 (M/NS). [top]   34 Waterbody: EAST MATAGORDA BAY Watershed : East Matagorda Bay TMDL ID: TX-2441-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 2.6%of the bay (1.5 mi near the Caney Creek confluence with the bay, Intracoastal Waterway, marsh and fishing cabins) does not support and 2.9% of the bay (1.7 minear the Live Oak Bayou confluence)partially supports the oyster water use (L/NS/PS). The remaining 94.5% (55.8 mi) fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potentialmicrobial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. [top]   35 Waterbody: MATAGORDA BAY/POWDERHORN LAKE Watershed: Central Matagorda Bay TMDL ID: TX-2451-1998 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, 8.3% of the bay (21.7 mi at the west end) does not support and 1.7% of the bay (4.4 miof Powderhorn Lake) partially supports the oyster water use (L/NS/PS).  The remaining 90% (235.5 mi) fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. [top]   36 Waterbody: TRES PALACIOS BAY Watershed : Central Matagorda Bay TMDL ID: TX-2452-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 49% of the bay (7.2 mi of the upper half) does not support and 51% of the bay (7.5 mi of the lower half) partially supports the oyster water use (L/NS/PS).  Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. Probable cause for nonsupport is Tres Palacios Creek. [top]   37 Waterbody: CARANCAHUA BAY Watershed : Central Matagorda Bay TMDL ID: TX-2456-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 48.4% of the bay (9.2 mi at the north end of the bay and Carancahua Creek) does not support the oyster water use (L/NS). The remaining 51.6% (9.8 mi) of the bay fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   38 Waterbody: COX BAY Watershed : Central Matagorda Bay TMDL ID: TX-2454-1998 TMDL Development Priority: MEDIUM Parameter of Concern: MERCURY, PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The Texas Department of Health has issued an aquatic life closure for 1.7 square miles of the segment due to elevated mercury levels in fish and crab tissue (M/NS). Based on Texas Department of Health shellfish maps, 16.2% of the bay (0.5 mi at thenorth end of the bay and Cox Creek) does not support the oyster water use (L/NS). The remaining 83.8% (2.4 mi) of the bay fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   39 Waterbody: LAVACA BAY/CHOCOLATE BAY Watershed : Central Matagorda Bay TMDL ID: TX-2453-1998 TMDL Development Priority: MEDIUM Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: The Texas Department of Health has issued an aquatic life closure for 2.5 square miles of the segment due to elevated mercury levels in finfish and crab tissue. Mercury contamination is residual from historical sources (M/NS). Based on Texas Department of Health shellfish maps, 34.1% of the bay (18.7 mi the north-northwest end of the bay near the Lavaca River confluence and the area around Port Lavaca, including Chocolate Bay) does not support and 37.7% of the bay (20.7 mi of the area adjacentto the nonsupporting area on the west side of the bay) partially supports the oyster water use (L/NS/PS). The remaining 28.2% (15.4 mi) fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. [top]   40 Waterbody: SAN ANTONIO BAY/HYNES BAY/GUADALUPE BAY Watershed: East San Antonio Bay TMDL ID: TX-2462-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 8.5% of the bay (10.2 mi at the north end of the bay near the San Antonio and Guadalupe River confluences and the area adjacent to Seadrift) does not support and 50.9% (60.8 mi of the area south ofthe nonsupporting area, including Hynes Bay up to the Intracoastal Waterway) of the bay partially supports the oyster water use (L/NS/PS). The remaining 40.6% (48.5 mi) of the bay fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. Partially supporting areas are conditionally approved for the growing and harvesting of shellfish. [top] 41 Waterbody: ST. CHARLES BAY Watershed : Aransas Bay TMDL ID: TX-2473-1998 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,51.5% of the bay (6.7 mi of the northern half, tributary and marsh drain) does not support the oyster water use (L/NS).  The remaining 48.5% (6.4 mi) of the bay fully supports the oyster water use.Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   42 Waterbody: ARANSAS BAY Watershed : Aransas Bay TMDL ID: TX-2471-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 7.8% of the bay (6.8 mialong the northern edge of the bay and Rockport) does not support the oyster water use (L/NS). The remaining 92.2% (81.0 mi) of the bay fully supports the oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   43 Waterbody: COPANO BAY Watershed : Aransas Bay TMDL ID: TX-2472-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 20.6% of the bay (13.4 minear the Intracoastal Waterway, shoreline and Aransas/Mission Rivers) does not support the oyster water use (L/NS). The remaining 79.4% (51.8 mi) of the bay fully supportsthe oyster water use. Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   44 Waterbody: NUECES BAY Watershed : North Corpus Christi Bay TMDL ID: TX-2482-1998 TMDL Development Priority: MEDIUM Parameter of Concern: ZINC Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 100% of the bay (28.9 mi) does not support the oyster water use (M/NS). Nonsupporting areas are restricted or prohibited for the growing and harvesting of shellfish for direct marketing due to zincin oyster tissue. [top]   45 Waterbody: CORPUS CHRISTI INNER HARBOR Watershed: South Corpus Christi Bay TMDL ID: TX-2484-1998 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 Avery and Viola Turning Basins (L/PS). [top]   46 Waterbody: OSO BAY Watershed : South Corpus Christi Bay TMDL ID: TX-2485-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS, ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments : Dissolved oxygen concentrations are occasionally lower than the standard established to assure optimum habitat conditions for aquatic life in the lower portion of the bay (L/PS). Based on Texas Department of Health shellfish maps, 100% of the bay (7.2 mi) does not support the oyster water use (L/NS). Nonsupporting areas are restricted for the growing and harvesting of shellfish for direct marketing, or prohibited due to potential microbial contamination. Studies and analyses are underway or pending. [top]   47 Waterbody: CORPUS CHRISTI BAY Watershed : North Corpus Christi Bay TMDL ID: TX-2481-1998 TMDL Development Priority: LOW Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 13.0% of the bay (16.0 mi near Corpus Christi) does not support the oyster water use (L/NS).  The remaining 87.0% (107.1 mi) of the bay fully supports the oyster water use. Nonsupporting areas arerestricted or prohibited for the growing and harvesting of shellfish for direct marketing due to potential microbial contamination. [top]   48 Waterbody: LAGUNA MADRE Watershed : North Laguna Madre TMDL ID: TX-2491-1998 TMDL Development Priority: E Parameter of Concern: PATHOGENS Point Sources Contributing to Impairment: Yes Non-Point Sources Contributing to Impairment: Yes Comments: Based on Texas Department of Health shellfish maps, 5.2% of the bay (18.1 mi near the Arroyo Colorado) does not support the oyster water use (L/NS), and 38.8% (134.8 mi) of the bay fully supports the oyster water use. The remaining 56% (194.6 mi) ofLaguna Madre, from Port Mansfield to Corpus Christi, has not been assessed. Nonsupporting areas are restricted for the growing and harvesting of shellfish for direct marketing, or prohibited due to potential microbial contamination. [top]   49 Waterbody: ARROYO COLORADO TIDAL Watershed : South Laguna Madre TMDL ID: TX-2201-1998 TMDL Development Priority: U 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 (U/NS). Comments received from the Texas Parks and Wildlife Department suggest that depressed dissolved oxygen impairs aquatic life in the upper 16 miles of the segment, and point out that the segment provides important habitat for many economically, ecologically, and recreationally valuable species. A TMDL is underway. [top]   50 Waterbody: GULF OF MEXICO Watershed : Sabine Lake TMDL ID: TX-2501-1998 TMDL Development Priority: LOW Parameter of Concern: MERCURY Point Sources Contributing to Impairment: No Non-Point Sources Contributing to Impairment: No Comments: The fish consumption use is partially supported in the entire segment (3,879 mi) (L/PS). A restricted-consumption advisory for the general population was issued by the Texas Department of Health in June 1997 due to elevated levels of mercury in kingmackerel. [top]

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