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Manatee County Water Atlas


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Lower Manatee River

Lower Manatee River

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located within Manatee River Watershed

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Description

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 site
Hydrology sampling site
Closest Rainfall site
Rainfall sampling site
Multi-type sampling site
Other sampling site
 

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 »

 

Whole River Range

Data by River Segment

0 - 20
- Good
Oct-Dec 2019

WQI Data Table and Graph

 

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 »

Parameter Latest Value Historic Range Additional Information
Total Nitrogen (TN) 614.0 ug/l
6/4/2019 12:20:00 PM
Source: FDEP Watershed Monitoring Section
91.0 - 7,760.0 ug/L
9/21/1976 - 6/4/2019
639 samples
Total Phosphorus (TP) 450.0 ug/L
6/4/2019 12:20:00 PM
Source: FDEP Watershed Monitoring Section
30.0 - 1,720.0 ug/L
9/21/1976 - 6/4/2019
645 samples
Chlorophyll a,
uncorrected for
pheophytin help icon
9.9 ug/L
6/4/2019 12:20:00 PM
Source: FDEP Watershed Monitoring Section
0.0 - 178.0 ug/L
1/27/1982 - 6/4/2019
547 samples
Chlorophyll a,
corrected for
pheophytin help icon
8.2 ug/L
6/4/2019 12:20:00 PM
Source: FDEP Watershed Monitoring Section
0.0 - 115.0 ug/L
9/21/1983 - 6/4/2019
256 samples

    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 »

     

    Whole River Range

    Data by River Segment

    As of 6/1/2016:

    down Average turbidity is lower than it has been historically.

    Clarity Data Table and Graph

     

      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 bacteria »

      Parameter Latest Value Historic Range Additional Information
      Fecal Coliform 320 CFU/100ml
      12/7/2016
      Source: FDEP Watershed Monitoring Section
      1 - 20,000 CFU/100ml
      8/26/1974 - 12/7/2016
      598 samples
      Total Coliform 120 CFU/100ml
      3/5/2002
      Source: Manatee County Environmental Management Sampling Data
      10 - 24,000 CFU/100ml
      9/27/1971 - 3/5/2002
      230 samples
      Enterococcus 107 CFU/100ml
      6/6/2017 12:40:00 PM
      Source: FDEP Watershed Monitoring Section
      3 - 20,000 CFU/100ml
      1/5/2000 - 6/6/2017
      230 samples
      E. coli 13 CFU/100ml
      6/4/2019 12:20:00 PM
      Source: FDEP Watershed Monitoring Section
      13 - 500 CFU/100ml
      1/5/2000 - 6/4/2019
      33 samples

        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 »

        Parameter Latest Value Historic Range Additional Information
        Dissolved Oxygen 6.1 mg/l
        6/4/2019 12:20:00 PM
        Source: FDEP Watershed Monitoring Section
        0.7 - 13.4 mg/l
        3/2/1967 - 6/4/2019
        1,071 samples

          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 0.1 ppt
          12/5/2017
          Source: Manatee County Environmental Management Sampling Data
          0.0 - 32.4 ppt
          12/12/1966 - 12/5/2017
          517 samples

          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.

          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 Environmental Protection Agency's 303(d) list:

          WBID Basin Impairment(s) EPA Details
          1848B MANATEE RIVER BELOW DAM MERCURY IN FISH TISSUE View additional EPA information »

          Source(s): US Environmental Protection Agency

           

           

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