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St. Johns River Watershed

St. Johns River Watershed

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Description

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

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Map Legend

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

Water Quality

The following data are summarized as seasonal average values for lake and river sampling locations located within the watershed. While these data are useful to serve as a general picture of watershed health, these data must be viewed with caution because these samples have been taken from ecologically different water resources.

Rivers:
Samples from most rivers located in this watershed are averaged as part of these data summaries.
Season Total Nitrogen Nitrate (NO3) Total Phosphorus Orthophosphate Number of Sample Stations Number of Samples
OCT-DEC 2019 1,223 ug/l No Data Available 98 ug/l No Data Available 1 3
JUL-SEP 2019 1,097 ug/l No Data Available 54 ug/l 0.03 mg/l 3 4
APR-JUN 2019 992 ug/l No Data Available 65 ug/l 0.02 mg/l 21 30
JAN-MAR 2019 965 ug/l No Data Available 51 ug/l 0.03 mg/l 18 30
OCT-DEC 2018 1,052 ug/l No Data Available 81 ug/l 0.05 mg/l 22 37
JUL-SEP 2018 1,226 ug/l No Data Available 129 ug/l 0.1 mg/l 18 30
APR-JUN 2018 1,378 ug/l No Data Available 87 ug/l 0.04 mg/l 19 31
JAN-MAR 2018 1,308 ug/l No Data Available 77 ug/l 0.04 mg/l 17 27
Five Year Seasonal Graph No Data Available
Five Year Graph of All Samples No Data Available

Source(s): Lake County Surface Water Quality, FDEP Historic Data from Legacy STORET, FFWCC Legacy Storet Data, Seminole County Legacy Storet Data, Volusia County Water Quality Data, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, Florida Fish and Wildlife Conservation Commission Water Quality Data, FDEP Watershed Monitoring Section, SJRWMD Water Quality Sampling Data, Volusia County Sampling Data, FDEP, Water Quality Standards and Special Projects (Florida), USGS National Water Information System, Watershed Action Volunteer Water Quality Data, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, St. Johns River Water Management District, Volusia County Sampling Data

Lakes:
Samples from most lakes located in this watershed are averaged as part of these data summaries.
Season Total Nitrogen Nitrate (NO3) Total Phosphorus Orthophosphate Number of Sample Stations Number of Samples
OCT-DEC 2018 543 ug/l No Data Available 8 ug/l No Data Available 3 6
JUL-SEP 2018 387 ug/l No Data Available 5 ug/l No Data Available 3 9
APR-JUN 2018 344 ug/l No Data Available 200 ug/l No Data Available 4 8
JAN-MAR 2018 288 ug/l No Data Available 9 ug/l No Data Available 3 9
Five Year Seasonal Graph No Data Available No Data Available
Five Year Graph of All Samples No Data Available No Data Available

Source(s): Lake County Surface Water Quality, LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, FDEP Watershed Monitoring Section, FDEP, Water Quality Standards and Special Projects (Florida), Watershed Action Volunteer Water Quality Data, FDEP Watershed Monitoring Section

  • Water Quality Sampling Locations - View a map showing the point locations of water quality monitoring stations which collect data being presented on the Water Atlas.
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Groundwater Quantity: Aquifer Resource Indicator

Southwest Florida Water Management District calculates the Aquifer Resource Indicator (ARI) for their three groundwater regions each month. The ARI was created to provide the public with a gauge of groundwater levels in their area, so they can develop an understanding of the severity and cycles of drought and recovery. The three regions include: North (Citrus, Hernando, Lake, Levy, Marion, and Sumter counties), Central (Hillsborough, Pasco, Pinellas, and Polk counties), and South (Charlotte, DeSoto, Hardee, Highlands, Manatee, and Sarasota counties). Learn More about the Aquifer Resource Indicator >>

To determine the ARI for a region, each well is compared weekly to its respective low-normal value and the difference is calculated. The weekly differences are reduced to a monthly value for all monitoring wells within a region, and the resulting ARI value represents how far water levels in the aquifer must rise or fall to reach their respective low-normal values.

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Source: SWFWMD Hydrologic Data Section Data


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    Stream Flow and Levels

    Stream level and flow data for the St. Johns River Watershed. Learn More about Stream Flow »

    River Flows Whole River Range Flows Data by Segment Levels Whole River Range Levels Data By Segment
    Saint Johns River In the past 30 days
    down Average river flow is slower than it has been historically.
    In the past 30 days
    down Average water levels are lower than they have been historically.
    Wekiva River In the past 30 days
    up Average river flow is faster than it has been historically.
    In the past 30 days
    up Average water levels are higher than they have been historically.
    Blackwater Creek In the past 30 days
    up Average river flow is faster than it has been historically.
    In the past 30 days
    up Average water levels are higher than they have been historically.

    Source(s): Lake County, Orange County, Orange County, Orange County, Seminole County Government, St. Johns River Water Management District, St Johns River Water Management District, Southwest Florida Water Management District, Southwest Florida Water Management District, USGS National Water Information System

    Source(s): Not Available
    • Hydrologic Sampling Locations - View a map showing the point locations of hydrologic monitoring stations which collect data being presented on the Water Atlas.
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