Caution
Rating icon - Chlorophyll a Rating icon - Total Nitrogen Rating icon - Total Phosphorous Rating icon - Dissolved Oxygen Saturation

3 out of 4 indicators were rated as PASS.

All four indicators must pass for the creek to be rated as PASS.

Learn more about how this report is created

  • Size: 284 acres
  • Location: Central Sarasota County
  • Discharges into: Little Sarasota Bay

For more information, please see: Little Sarasota Bay Water Quality Management Plan (2012)

View county-wide water quality trends »

Clower Creek

Clower Creek

Water Chemistry Ratings | Freshwater Portion of the Creek

Creek Conditions Ratings are based on comparing nitrogen, phosphorus, chlorophyll and dissolved oxygen to water quality guidelines or regulations. Florida law defines a maximum allowable concentration of nitrogen, phosphorus, and chlorophyll a, and a minimum allowable concentration of dissolved oxygen in these streams. Learn more about these ratings and how they are calculated »

Data for the following WBIDs is averaged when compiling the data below:
  • 1975A
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: ug/l Year
2024
Historical
period of record
High 25.80 150.00
Mean 11.7893 4.2952 11.90981
Low 5.24 0.10
No. of Samples 12 476

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 1.982 14.051
Mean 1.3462 1.3123 1.13326614
Low 0.963 0.0022
No. of Samples 12 400

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 0.356 3.093
Mean 0.1945 0.2889 0.43305185
Low 0.12 0.067
No. of Samples 12 425

Five-year Rolling Average

  • Annual Mean
Pass

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources.
Score: Pass
Units: percent (%) Year
2024
Historical
period of record
High 101.853 150.548
Mean 40.6 40.2 24.02746
Low 5.6061 2.20
No. of Samples 12 501

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

BOD, Biochemical oxygen demand

Units: mg/l Year
2024
Historical
period of record
High 2.78 6.97
Mean 1.33 1.18 0.90458
Low 1.00 0.23
No. of Samples 12 333

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2024
Historical
period of record
High 220.00 300.00
Mean 97.21 90.13 43.46867
Low 60.00 10.00
No. of Samples 12 512

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: MPN/100ml Year
2024
Historical
period of record
High 2282.00 19863.00
Mean 713.88 751.56 2797.87622
Low 228.00 10.00
No. of Samples 12 99

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2024
Historical
period of record
High 0.301 7.00
Mean 0.1 0.08 0.37997561
Low 0.024 0.00
No. of Samples 12 503

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2024
Historical
period of record
High 1.83 14.00
Mean 1.28 1.14 0.95118568
Low 0.942 0.17
No. of Samples 12 474

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2024
Historical
period of record
High 0.152 2.90
Mean 0.05 0.13 0.26422131
Low 0.021 0.00
No. of Samples 12 433

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2024
Historical
period of record
High 7.61 9.14
Mean 7.28 7.2 0.34135
Low 6.88 4.70
No. of Samples 12 547

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2024
Historical
period of record
High 0.6647 35.25
Mean 0.32 0.97 9.10727
Low 0.1542 0.00
No. of Samples 12 465

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2024
Historical
period of record
High 1315.30 52344.00
Mean 646.11 1134.21 10598.228
Low 320.32 0.342
No. of Samples 12 582

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2024
Historical
period of record
High 88.574
Mean 74.01 7.28948
Low 49.784
No. of Samples 0 417

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2024
Historical
period of record
High 117.00
Mean 7.75 13.86968
Low 1.20
No. of Samples 0 417

Five-year Rolling Average

  • Annual Mean

Water Chemistry Ratings | Tidal Portion of the Creek

Creek Conditions Ratings are based on comparing nitrogen, phosphorus, chlorophyll and dissolved oxygen to water quality guidelines or regulations. Florida law defines a maximum allowable concentration of chlorophyll a and a minimum allowable concentration of dissolved oxygen in these streams. Florida has no regulatory thresholds for nitrogen or phosphorus in tidal creeks so trends are used to rate the creeks. Learn more about these ratings and how they are calculated »

Data for the following WBIDs is averaged when compiling the data below:
  • 1975A
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: ug/l Year
2024
Historical
period of record
High 24.0 24.0
Mean 10.5972 8.4509 5.50218
Low 3.57 2.23
No. of Samples 12 25

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 1.6 1.8
Mean 1.2446 1.1924 0.27685504
Low 0.887 0.708
No. of Samples 12 28

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 0.4 0.5
Mean 0.2566 0.2297 0.11541296
Low 0.135 0.048
No. of Samples 12 28

Five-year Rolling Average

  • Annual Mean
Caution

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources
Score: Caution
Units: percent (%) Year
2024
Historical
period of record
High 72.3 76.1
Mean 28.99 25.58 20.54731
Low 0.97 0.97
No. of Samples 12 27

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

BOD, Biochemical oxygen demand

Units: mg/l Year
2024
Historical
period of record
High 4.0 4.0
Mean 1.39 1.38 0.93614
Low 1.00 1.00
No. of Samples 12 28

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2024
Historical
period of record
High 80.0 140.0
Mean 61.88 59.69 29.31439
Low 40.00 30.00
No. of Samples 12 25

Five-year Rolling Average

  • Annual Mean

Enterococcus Group Bacteria

Units: MPN/100ml Year
2024
Historical
period of record
High 5,475.0 27,000.0
Mean 1349.19 1398.74 5732.86325
Low 121.00 10.00
No. of Samples 11 24

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2024
Historical
period of record
High 0.4 0.6
Mean 0.1 0.16 0.17138399
Low 0.049 0.044
No. of Samples 12 28

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2024
Historical
period of record
High 1.5 1.7
Mean 1.19 1.12 0.27365124
Low 0.868 0.649
No. of Samples 12 28

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2024
Historical
period of record
High 0.1 0.1
Mean 0.04 0.05 0.03148084
Low 0.012 0.012
No. of Samples 12 24

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2024
Historical
period of record
High 7.8 8.0
Mean 7.38 7.29 0.38008
Low 7.03 6.4967
No. of Samples 12 27

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2024
Historical
period of record
High 36.6 37.5
Mean 8.59 17.04 11.37617
Low 0.0987 0.0987
No. of Samples 12 27

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2024
Historical
period of record
High 54,268.9 55,455.1
Mean 13931.59 26697.74 16716.1809
Low 156.563 156.563
No. of Samples 12 27

Five-year Rolling Average

  • Annual Mean

Oysters

Because they are immobile and will tolerate a fairly wide salinity range, eastern oysters (Crassostrea virginica) are valuable as an indicator of the relative health of aquatic ecosystems in the tidally-influenced portions of coastal creeks. Sarasota County has established an oyster monitoring program to track the location, types, and status of oyster reefs. Data from this monitoring program is shown below. Learn more about Oysters »

This tidal creek has no oyster sites.

Impervious Features

Clower Creek is located within the Little Sarasota Bay Watershed. View details about the Little Sarasota Bay Watershed »

Rain that falls on land that is in a natural state is absorbed and filtered by soils and vegetation as it makes it way into underground aquifers. However, in developed areas, "impervious surfaces" impede this process and contribute to polluted urban runoff entering surface waters. These surfaces include human infrastructure like roads, sidewalks, driveways and parking lots that are covered by impenetrable materials such as asphalt, concrete, brick and stone, as well as buildings and other permanent structures. Soils that have been disturbed and compacted by urban development are often impervious as well. Learn more about Impervious Features »

The Sarasota County Stormwater Environmental Utility (SEU) mapped impervious surfaces in the County in 2013. A map showing impervious surfaces can be viewed using the Water Atlas Map Viewer tool.

53% of the land area within the Clower Creek Basin is covered by impervious surfaces

Impervious Surface Coverage by Type

Land Use / Land Cover

Clower Creek is located within the Little Sarasota Bay Watershed. View details about the Little Sarasota Bay Watershed »

Land use within a creek's watershed has a major effect on its water quality. In general, less development means better water quality. Land Cover/Land Use classifications categorize land in terms of its observed physical surface characteristics (e.g. upland or wetland), and also reflect the types of activity that are taking place on it (agriculture, urban/built-up, utilities, etc.). Florida uses as its standard a set of statewide classifications which were developed by the Florida Department of Transportation. Learn more about Land Use and Land Cover »

Acreage and Percentage within each Land Use / Land Cover Category for Clower Creek Basin
Land Use Classification 1990 1995 1999 2005 2011 2014 2017 2020 Trend
Urban & Built-up 22278% 22177.8% 22077.4% 21976.9% 21976.9% 21976.9% 21976.9% 21976.9% Land Use Trend Sparkline
Rangeland 00% 10.3% 10.3% 10.3% 10.3% 10.3% 10.3% 10.3% Land Use Trend Sparkline
Upland Forests 3010.6% 3010.6% 3010.6% 3010.6% 3010.6% 3010.6% 3010.6% 3010.6% Land Use Trend Sparkline
Water 134.4% 155.1% 145% 145% 145% 145% 145% 145% Land Use Trend Sparkline
Wetlands 10.2% 00% 10.5% 10.5% 10.5% 10.5% 10.5% 10.5% Land Use Trend Sparkline
Barren Land 51.6% 00% 00% 00% 00% 00% 00% 00% Land Use Trend Sparkline
Transportation and Utilities 155.2% 176.1% 176.1% 196.7% 196.7% 196.7% 196.7% 196.7% Land Use Trend Sparkline
Land Use Chart