Sarasota County Water Atlas

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Hudson Bayou

Hudson Bayou


located within Sarasota Bay Watershed

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Explore general as well as scientific information about the movement, chemistry and biology of area surface water environments.

The data on this page are designed to give you a picture of the total health of this waterbody. Click the "Learn More" text to learn more about each parameter shown and how it indicates Water Quality.

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Water Quality Sampling Sites
Hydrology Sampling Sites
Other Sampling Sites

Water Quality Index

Water Quality Index (WQI) is an average of 5 different parameters giving a river a good (0-45), fair (45-60), or poor (60+) rating. Learn more about the Water Quality Index »

Water Quality Index

Whole River Range

29 - 48
Good - Fair
Oct-Dec 2017

Data by River Segment

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Nutrient Chemistry

Although present in all surface waters, nutrients are among the leading causes of degradation of Florida water resources. Learn more about nutrient chemistry »

Nutrient Chemistry
Parameter Latest Value Historic Range Additional Information
Total Nitrogen (TN) NO DATA 54.0 - 2,704.0 ug/L
11/15/1977 - 10/24/2016
259 samples
Total Phosphorus (TP) NO DATA 50.0 - 1,700.0 ug/L
1/27/1975 - 10/16/2017
487 samples
Chlorophyll a,
uncorrected for
pheophytin help icon
NO DATA 0.5 - 102.0 ug/L
1/5/1982 - 10/16/2017
24 samples
Chlorophyll a,
corrected for
pheophytin help icon
NO DATA 0.3 - 156.8 ug/L
1/5/1982 - 12/19/2016
411 samples
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    Water Clarity

    Water clarity or turbidity measures the degree to which light is blocked because the water is cloudy or contains suspended particles, such as algae. Water clarity is one indicator of a waterbody's ability to sustain plants and wildlife. Learn more about water clarity »

    Water Clarity

    Whole River Range


    No turbidity data is currently available.

    Data by River Segment

    • No data table or graph available

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      The currently used bacterial indicators for recreational waters include total coliform, fecal coliform and enterococcus. Indicator organisms themselves are not necessarily pathogenic but their presence "indicates" or suggests recent contamination by human sewage or other waste which may result in human illness. Sources of contamination include storm water runoff, sewage overflows and feces from wild and domestic animals. Learn more about bacteria »

      Parameter Latest Value Historic Range Additional Information
      Fecal Coliform NO DATA 10 - 200,000 CFU/100ml
      5/21/1974 - 10/16/2017
      526 samples
      Total Coliform NO DATA 2 - 140,000 CFU/100ml
      6/21/1971 - 12/15/2003
      131 samples
      Enterococcus NO DATA NO DATA NO DATA
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        Dissolved Oxygen

        Dissolved Oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Learn more about dissolved oxygen »

        Additional Parameters
        Parameter Latest Value Historic Range Additional Information
        Dissolved Oxygen NO DATA -0.2 - 342.0 mg/l
        10/3/1973 - 10/16/2017
        503 samples
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          Salinity measures the amount of salts dissolved in water. An estuary can exhibit a change in salinity throughout its length as fresh water entering from the tributaries mixes with seawater from the ocean. Learn more about salinity »
          Parameter Latest Value Historic Range Additional Information
          Salinity NO DATA 0.0 - 34.7 ppt
          3/8/1982 - 10/16/2017
          312 samples
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          Impaired Waters

          The Impaired Waters Data is the most recent available data from FDEP, but it may not reflect the current FDEP impaired list. These data are updated when and as soon as they are made available from FDEP.


          This waterbody is impaired according to the State of Florida's Impaired Waters Rule (IWR) Chapter 62-303 F.A.C. that governs the Total Maximum Daily Loads (TMDL) Program or according to the U.S. Environmental Protection Agency (EPA). Identification of Impaired Surface Waters (IWR) is a new scientific approach for guiding Florida Department of Environmental Protection process for identifying and prioritizing impaired surface waters in Florida. The rule evaluates whether waters meet their designated uses for a particular analyte, which include aquatic life use support, primary contact and recreation use support, fish and shellfish consumption use support, and drinking water use support. All water resources in this county are designated as Class III waters. Class III waters are considered recreational use waters, which means that the water should be fishable and swimmable. Class II waters are for shellfish propagation and harvesting. Class I waters are considered potable (drinkable) water supplies. As part of the terms of a court order related to the 1998 303(d) list of impaired waters, some waters are listed as impaired by EPA but not listed by the State of Florida. Learn more about impaired waters »


          This waterbody has been associated with the following WBIDs deemed impaired by the Florida Department of Environmental Protection:

          WBID Basin Impairment(s)

          Source(s): Florida Department of Environmental Protection

          This waterbody has been associated with the following WBIDs deemed impaired by the Environmental Protection Agency's 303(d) list:

          WBID Basin Impairment(s) EPA Details

          Source(s): US Environmental Protection Agency

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          Advanced Data Features

          Files Graphs

          Data Download and Advanced Graphing Tool
          Download and/or graph water quality, hydrology, and rainfall trends using the data presented on the Atlas for use in your own analyses and reports.

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