Clower Creek Condition Report for 2020

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 »

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Clower Creek

Clower Creek
Visit the Clower Creek water resource page »

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
Water quality data for the freshwater portion of this creek are not available at this time.

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
2020		 Historical
period of record
High 23.4 150.0
Mean 5.7985 4.125 12.2663
Low 1.99 0.10
No. of Samples 12 427

Five-year Rolling Average

  • Annual Mean
×

Chlorophyll a

The rating for Chlorophyll a is determined by comparing the annual arithmetic mean of its sampled values to fixed target and threshold values. The annual arithmetic mean is shown in the graph at left, as compared to its established target and threshold values.

An arithmetic mean is used for Chlorophyll a for consistency with the Surface Water Quality Standards, Florida Administrative Code 62-302.532, Estuary-Specific Numeric Interpretations of the Narrative Nutrient Criterion.

Pass

Nitrogen, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2020		 Historical
period of record
High 6.2 14.1
Mean 1.3185 1.2936 1.11226005
Low 0.736 0.0022
No. of Samples 12 426

Five-year Rolling Average

  • Annual Mean
×

Nitrogen, Total

Pass

Phosphorus, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2020		 Historical
period of record
High 0.6 3.1
Mean 0.215 0.2899 0.4145027
Low 0.085 0.039
No. of Samples 12 465

Five-year Rolling Average

  • Annual Mean
×

Phosphorus, Total

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
2020		 Historical
period of record
High 67.7 150.5
Mean 55.56 40.1 23.84284
Low 27.8257 2.20
No. of Samples 12 504

Five-year Rolling Average

  • Annual Mean
×

Dissolved Oxygen Saturation

BOD, Biochemical oxygen demand

Units: mg/l Year
2020		 Historical
period of record
High 1.8 7.0
Mean 1.13 1.15 0.84716
Low 1.00 0.23
No. of Samples 12 376

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2020		 Historical
period of record
High 120.0 300.0
Mean 84.67 90.13 43.93434
Low 60.00 10.00
No. of Samples 12 499

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2020		 Historical
period of record
High 0.3 7.0
Mean 0.12 0.08 0.37122332
Low 0.01 0.00
No. of Samples 12 529

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2020		 Historical
period of record
High 5.9 14.0
Mean 1.08 1.12 0.92048714
Low 0.484 0.17
No. of Samples 12 513

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2020		 Historical
period of record
High 0.6 2.9
Mean 0.17 0.15 0.31050102
Low 0.057 0.00
No. of Samples 12 477

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2020		 Historical
period of record
High 7.4 8.5
Mean 7.21 7.19 0.32811
Low 7.05 4.70
No. of Samples 12 551

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2020		 Historical
period of record
High 0.6 35.3
Mean 0.32 0.91 8.75571
Low 0.1526 0.00
No. of Samples 12 506

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2020		 Historical
period of record
High 1,243.8 52,344.0
Mean 641.26 1206.52 11560.79474
Low 317.574 0.342
No. of Samples 12 579

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2020		 Historical
period of record
High 88.6
Mean 73.76 7.36256
Low 49.784
No. of Samples 0 486

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2020		 Historical
period of record
High 117.0
Mean 7.57 14.25583
Low 1.20
No. of Samples 0 465

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

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 »

Loading oyster site map...

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