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Questions or Comments: tmdl@tceq.texas.gov

Dickinson Bayou: Implementing a Plan to Protect Recreational Uses

A community project to protect recreational uses by reducing bacteria. The total maximum daily load (TMDL) is adopted and the implementation plan (I-Plan) is approved. Together, the TMDL and I-Plan are the road map to improved water quality.
photo of Dickinson Bayou at FM 517
Dickinson Bayou at FM 517
map of the Dickinson Bayou watershed

County: Galveston
Parameter: Bacteria
Basin: San Jacinto–Brazos Coastal
Segments: 1103, 1103A, 1103B, 1103C, 1103D, 1103E, 1104

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Background and Goal

High concentrations of bacteria measured in 2004 in Dickinson Bayou Tidal, Segment 1103, and four of its tributaries may pose a health risk for people who swim or wade water body—activities called “contact recreation” in the state’s standards for water quality.

Fecal bacteria are commonly found in the intestines of warm-blooded organisms such as humans, livestock, poultry, cats, and dogs. Bacteria from human and animal waste often indicate the presence of disease-causing microorganisms, which can pose a health threat to people who engage in contact recreation.

The goal of the TMDL project is to reduce bacteria concentrations to within acceptable risk levels for contact recreation.

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Watershed Description

Dickinson Bayou is located in the San Jacinto-Brazos Coastal Basin. Its watershed includes portions of Brazoria and Galveston counties and the cities of Alvin, Santa Fe, Dickinson, and League City. The bayou originates near the city of Alvin, south of Houston, and flows east through the city of Dickinson before joining Dickinson Bay. 

Upstream of the tidal influence, Dickinson Bayou (Segment 1104) is a small coastal prairie stream. The tidal segment (1103) ranges from a relatively narrow, forested stream in its upper reaches to a very wide and relatively deep tidal stream.

Dickinson Bayou is used by residents for recreational boating, fishing, water skiing, canoeing, and other activities. The lower tidal portions support some commercial shrimp harvesting and barge traffic. Rice fields in the upper watershed receive irrigation water via canals from beyond the watershed. The used irrigation water returns to Dickinson Bayou. Although the return flows contributed substantially to flow in the bayou in the past, rice farming has diminished significantly in the upper Dickinson watershed since the mid-1970s.

Status and Activities

TCEQ provides opportunities for stakeholders to report on progress and changes in the watershed. Tracking of implementation progress allows stakeholders to evaluate actions taken, identify actions that may not be working, and make any changes as necessary.

The initial TMDL project addressed Dickinson Bayou Segments 1103 and 1104 and three of the bayou’s tributaries—Bensons Bayou, Bordens Gully, and Giesler Bayou.

In 2016, TCEQ added TMDLs for two tributaries, Gum Bayou and Cedar Creek, through an update to the State of Texas Water Quality Management Plan, along with an assessment unit of Dickinson Bayou Tidal that was not addressed in the initial TMDL report.

In 2022, TCEQ proposes to add two more TMDLs for the bayou's watershed, for unnamed tributaries of Dickson Bayou Tidal and Gum Bayou, via an update to the State of Texas Water Quality Management Plan

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Get Involved

Stakeholders in the watershed formed the Dickinson Bayou Watershed Partnership to implement activities that improve water quality in Dickinson Bayou. The TCEQ worked with this existing forum to participate with the public in developing the TMDLs and I-Plan. Other partners include the Houston-Galveston Area Council, the Galveston Bay Estuary Program, and the Texas Cooperative Extension. Contact us about ways to get involved by e-mail at tmdl@tceq.texas.gov or by phone at 512-239-6682 and mention the Dickinson Bayou TMDL project.

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Approved Implementation Plan

The commission approved this stakeholder-developed I-Plan on January 15, 2014.

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Adopted Total Maximum Daily Loads

On February 8, 2012, the commission adopted these TMDLs. On June 6, 2012, the EPA approved the TMDLs, at which time they became part of the state’s Water Quality Management Plan. Learn more about the Texas Water Quality Management Plan.

Revisions to TMDLs

From time to time, it is necessary to revise TMDLs to account for changing conditions in the watershed. Revisions to TMDLs are made via the state’s Water Quality Management Plan (WQMP), which is updated quarterly.

The WQMP provides projected effluent limits for use in planning and permitting activities under the Texas Pollutant Discharge Elimination System (TPDES). The TCEQ reviews all applications for new and amended permits for conformance with applicable portions of the WQMP, including adopted TMDLs.

Revisions are made to TMDLs in one of two ways:

  • Updates are made to account for changing conditions in the watershed, such as new or revised wasteload allocations, permits that have been canceled or have expired, or changed facility names.
  • Addendums are created to add load allocations for assessment units that are impaired by the same pollutant or condition, within the same watershed, as in the original TMDL report adopted by the commission.

Both updates and addendums are provided in the same units of measure used in the original TMDL.

Addendums

Additional TMDLs for Dickinson Bayou have been added by addendum.

Updates

Revisions to the TMDL are documented an appendix in the approved WQMP update listed below.

  • October 2021, Appendix II, pages 18-19
  • April 2016, Appendix IV, pages 15-16

WQMP updates may be viewed in person at the TCEQ Library, Building A, 12100 Park 35 Circle, Austin, Texas. Electronic versions of updates published from 2014 through 2020 are available on the Texas State Library and Archives Commission website .

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Project Reports

Contact the TMDL Program

Please e-mail tmdl@tceq.texas.gov, and mention Dickinson Bayou in the subject line. Or call us at 512-239-6682.

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communities working together taking care of our rivers, lakes, and bays