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1
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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).
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2
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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).
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3
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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).
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4
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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.
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5
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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).
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6
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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).
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7
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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).
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8
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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).
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9
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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).
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10
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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).
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11
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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).
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12
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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.
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13
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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.
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14
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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).
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15
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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.
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16
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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).
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17
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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).
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18
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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.
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19
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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.
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20
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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.
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21
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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.
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22
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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.
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23
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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.
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24
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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.
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25
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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.
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26
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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).
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27
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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).
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28
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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.
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29
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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.
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30
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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)
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31
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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.
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32
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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).
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33
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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).
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34
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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.
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35
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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.
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36
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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.
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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.
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38
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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).
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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.
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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.
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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.
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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.
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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.
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