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Manatee County Water Atlas


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Lower Tampa Bay

Lower Tampa Bay

Lower Tampa Bay

Map

located within the following watersheds: Sarasota Bay Coastal Watershed, Tampa Bay Coastal Watershed

General Information

Description

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

Latest Information

Click the links below for more details:

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Map Legend

Water Quality Sampling Sites
Hydrology Sampling Sites
Other Sampling Sites
 

Beach Water Quality from the Florida Healthy Beaches Program

Coastal beach water samples collected every two weeks by the county health departments are analyzed for enterococci and fecal coliform bacteria. High concentrations of these bacteria may indicate the presence of microorganisms that could cause diseases, infections, or rashes. County health departments will issue health advisories or warnings when these conditions are confirmed. Learn more about the Florida Healthy Beaches Program »

Note: We are currently unable to provide you with the most recent samples and alerts on this page. Please click on the county/beach links below to find beach status and alerts.

Source: Florida Healthy Beaches Program
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    Overall Trophic State Index

    "Trophic" means "relating to nutrition." The Trophic State Index (TSI) takes into account chlorophyll, nitrogen, and phosphorus, which are nutrients required by plant life. The Florida Department of Environmental Protection (FDEP) uses this information to determine a rating for the waterbody. Learn more about the Trophic State Index »

    Water Quality Index
    Latest Value Limiting Nutrient Historic Range Additional Information
    39 (Good)
    12/14/2015
    Source: EPC Monthly Routine Water Monitoring
    NITROGEN NO DATA NO DATA
    Legend:
    Water Quality Trophic State Index Trophic State Classification
    GOOD0 - 49Oligotrophic through Mid-Eutrophic
    FAIR50 - 59Mid-Eutrophic through Eutrophic
    POOR60 - 100Hypereutrophic
     
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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) 414.0 ug/l
      12/14/2015
      Source: EPC Monthly Routine Water Monitoring
      0.0 - 39,006.0 ug/L
      6/1/1971 - 12/14/2015
      7,212 samples
      Total Phosphorus (TP) 124.0 ug/L
      12/14/2015
      Source: EPC Monthly Routine Water Monitoring
      0.0 - 27,580.0 ug/L
      2/2/1971 - 12/14/2015
      11,247 samples
      Chlorophyll a,
      uncorrected for
      pheophytin help icon
      4.0 ug/L
      12/14/2015
      Source: EPC Monthly Routine Water Monitoring
      0.0 - 10,000.0 ug/L
      2/23/1971 - 12/14/2015
      11,342 samples
      Chlorophyll a,
      corrected for
      pheophytin help icon
      2.0 ug/L
      6/17/2013
      Source: FDEP, Water Quality Standards and Special Projects (Florida)
      0.2 - 56.0 ug/L
      5/25/1983 - 6/17/2013
      283 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
        Parameter Latest Value Historic Range Additional Information
        Secchi Depth 16.4 ft
        8/14/2017 1:40:00 PM
        Source: EPC Monthly Routine Water Monitoring
        0.6 ft - 41.0 ft
        1/24/1972 - 8/14/2017
        11,139 samples
        Turbidity 2.0 NTU
        11/12/2015
        Source: Manatee County Environmental Management Sampling Data
        0.0 NTU - 505.0 NTU
        1/16/1974 - 11/12/2015
        17,043 samples
        Light Attenuation NO DATA NO DATA NO DATA
         
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          Bacteria

          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 marine indicator bacteria »

          Bacteria
          Parameter Latest Value Historic Range Additional Information
          Fecal Coliform 2 CFU/100ml
          6/15/2016
          Source: Shellfish Environmental Assessment Section
          1 - 231,000 CFU/100ml
          10/28/1969 - 6/15/2016
          9,831 samples
          Total Coliform 1 CFU/100ml
          11/14/2005
          Source: FDEP Southwest District Sampling Data
          0 - 250,000 CFU/100ml
          1/2/1967 - 11/14/2005
          3,993 samples
          Enterococcus 10 CFU/100ml
          12/27/2016
          Source: Florida Healthy Beaches Program and Data (Bacterial Counts)
          1 - 400 CFU/100ml
          8/2/2000 - 12/27/2016
          3,808 samples
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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 5.3 mg/l
            8/14/2017 1:41:58 PM
            Source: EPC Monthly Routine Water Monitoring
            0.5 - 20.5 mg/l
            1/25/1967 - 8/14/2017
            35,573 samples
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              Salinity

              Salinity
              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 27.0 ppt
              8/14/2017 1:41:58 PM
              Source: EPC Monthly Routine Water Monitoring
              0.3 - 47.0 ppt
              1/25/1967 - 8/14/2017
              32,085 samples
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              Bathymetric Maps and Depth Information

              These are the latest available contour maps of the bay's bottom. These maps can be used to determine where "holes" (deep spots) exist on the bay bottom. Such areas are often productive for fishing. Learn more about bathymetric maps »

              Bathymetric Map
              View Map Details Method River Elevation
              No Data Available No Data Available No Data Available No Data Available
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              Water Quality Contour Maps

              Example Contour Map

              Contour mapping is one of the best ways to visualize spatial differences in coastal water quality, but the software and technical expertise needed to create them is unavailable to the general public and is out of reach even to many environmental resource managers and scientists. With original funding from an Environmental Protection Commission of Hillsborough County's Pollution Recovery Fund grant, the Water Atlas Program developed online tools to allow rapid map creation and comparison. Using these tools, anyone can view, download and print predefined maps that are automatically generated from selected data on a periodic basis. Optionally, users can create their own custom contour maps to display any data that is stored on the Water Atlas, by choosing a water quality parameter and date range that interests them.

              Available water quality parameters include:

              Dissolved Oxygen, Salinity, Chlorophyll A, Color, Secchi Depth

              Create Custom Water Quality Contour Maps

              Access the Water Quality Contour Mapping System to generate your own custom water quality contour maps.

              OR

              View Generated Water Quality Contour Maps

              Monthly generated contour maps for all the parameters below are available.

                 
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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.

                Impaired

                All natural water resources in this county are designated as Class III waters except for parts of the Manatee River and its tributaries upstream of the Rye Road Bridge and parts of the Braden River and its tributaries upstream of the Evers Reservoir dam which are Class I. The Gulf and Coastal Waters of Tampa Bay, including the coastal waters of Manatee County and the lower Manatee River which are all Class II. Class III waters are considered recreational use waters, which means that the water should be fishable and swimmable. Class II waters are predominately marine waters suitable for shellfish propagation and harvesting. Class I waters are freshwaters considered suitable for potable (drinkable) water supplies.

                Many water resources exist in Manatee County whose primary purposes are the treatment and conveyance of stormwater. These water resources include ditches, canals, and ponds that are designed and maintained for flood control or stormwater management. In addition, some water resources have been created for industrial wastewater treatment. These are identified in the "Industrial Waterbodies" theme on the Water Atlas map. State water classifications do not normally apply to the above water resources. None should be considered "fishable or swimmable." Learn more about impaired waters »

                Pollutants

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

                WBID Basin Impairment(s)
                1558A TAMPA BAY (LOWER SEGMENT) BACTERIA (IN SHELLFISH)
                1558BZ TAMPA BAY (LOWER NORTH SEGMENT) BACTERIA (IN SHELLFISH)
                1797B BISHOPS HARBOR FECAL COLIFORM (SEAS CLASSIFICATION)
                1968A ANNA MARIA SOUND MERCURY (IN FISH TISSUE)

                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
                1558A TAMPA BAY (LOWER SEGMENT) CHLOROPHYLL-A, FECAL COLIFORM, MERCURY IN FISH TISSUE View additional EPA information »
                1558BZ TAMPA BAY (LOWER NORTH SEGMENT) CHLOROPHYLL-A, FECAL COLIFORM, MERCURY IN FISH TISSUE View additional EPA information »
                1797B BISHOPS HARBOR FECAL COLIFORM, MERCURY IN FISH TISSUE View additional EPA information »
                1968A ANNA MARIA SOUND CHLOROPHYLL-A, MERCURY IN FISH TISSUE View additional EPA information »

                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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