Watershed Summaries

The Watershed Summaries include information about water quality in each formally defined stream segment in the basins for which H-GAC conducts or manages monitoring, water quality assessment, and stakeholder outreach. Water quality impairments and concerns are identified in the Texas Integrated Report (IR) for Clean Water Act Sections 305(b) and 303(d), formerly called the Texas Water Quality Inventory and 303(d) List. The IR is a comprehensive evaluation of the condition of surface waters in the state of Texas based in historical monitoring data, and provides resource managers with a tool for making informed decisions when directing agency programs. It identifies water bodies that are not meeting standards set for their use in the Texas Surface Water Quality Standards, published in Title 30, Chapter 307 of the Texas Administrative Code. The federal Clean Water Act requires TCEQ to submit an updated IR to the EPA every two years.

The water quality summaries in this report are organized by Segment Number and Name. Each summary includes tables containing the following information:

  • Segment Length

  • Watershed Area

  • Designated Uses

  • Number of Active Monitoring Stations

  • Texas Stream Team Monitors

  • Permitted Outfalls

  • Description

  • Degree of Impairment and Overall Trends

  • FY 2011 Active Monitoring Stations

  • Standards and Screening Criteria

Click on the segment name to view a map and summary of water quality. Click on the segment number to view the water quality monitoring data summary.

Basin & Segment NameSegment Number
Trinity - San Jacinto Coastal Basin
Cedar Bayou Above Tidal 0902
Cedar Bayou Tidal 0901
San Jacinto River Basin
Buffalo Bayou Above Tidal 1014
Buffalo Bayou Tidal 1013
Caney Creek 1010
Cypresss Creek 1009
East Fork San Jacinto 1003
Greens Bayou 1016
Houston Ship Channel Tidal 1006
HSC San Jacinto River Tidal 1005
HSC Buffalo Bayou 1007
Lake Conroe 1012
Lake Creek 1015
Lake Houston 1002
Peach Creek 1011
San Jacinto River Tidal 1001
Spring Creek 1008
West Fork San Jacinto River 1004
White Oak Bayou 1017
San Jacinto - Brazos Coastal Basin
Armand Bayou Tidal 1113
Bastrop Bayou Tidal 1105
Chocolate Bayou Above Tidal 1108
Chocolate Bayou Tidal 1107
Clear Creek Above Tidal 1102
Clear Creek Tidal 1101
Dickinson Bayou Above Tidal 1104
Brazos - Colorado Coastal Basin
San Bernard River Above Tidal 1302
San Bernard River Tidal 1301
Bays & Estuaries - Gulf of Mexico
Upper Galveston Bay 2421
Barbours Cut 2436
Bastrop Bay / Oyster Lake 2433
Bayport Channel 2438
Black Duck Bay 2428
Burnett Bay 2430
Chocolate Bay 2432
Christmas Bay 2434
Clear Lake 2425
Drum Bay 2435
East Bay 2423
Lower Galveston Bay 2439
Moses Lake 2431
San Jacinto Bay 2427
Scott Bay 2429
Tabbs Bay 2426
Texas City Ship Channel 2437
West Bay 2424
Gulf of Mexico 2501

The Water Quality Issues summary table includes an overview of each water quality issue affecting the watershed; a comparison of impairments and concerns identified in the 2008 and 2010 TCEQ assessments; descriptions of the affected areas; possible causes and influences or concerns voiced by stakeholders; and possible solutions or actions to be taken.

The summary tables are followed by narrative discussions of watershed characteristics, water quality issues, special studies and projects completed in the watershed, water quality trends, and recommendations.

Several graphs accompany the discussions. Generally, these graphs are included to illustrate a trend for a critical water quality parameter that H-GAC considers important or unexpected. Typically the graph is a plot of measured values of a parameter over time where the trend has been found to be statistically-significant, but some graphs include an additional parameter believed to be associated with the critical parameter (for example, a plot with chlorophyll a and total phosphorus together to illustrate relationships between the two parameters). In some cases the annual median or geometric mean, rather than individual measurements, are plotted. Flow data from a United States Geological Survey gauging station has been added to the charts when the station is located near the TCEQ monitoring station.

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