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

The surface water system in the Clower Creek Basin has undergone major alterations over the past 100 years. Historical survey does not identify Clower Creek by name, but aerial photographs and survey from the mid-1900s confirm the presence of agriculture and the extent of the creek, which meandered northeast through the entire basin and terminated at a wetland near the east basin boundary. The entirety of Clower Creek is predominantly marine. Development in the basin was well under way by the 1970s. The basin is about 85% developed, with over 40% commercial development. Stormwater from these commercial areas flows through a network of pipes and ditches to Clower Creek. For basin details see: Little Sarasota Bay Water Quality Management Plan (2012)

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 »

Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Water quality data are not available for the freshwater portion of this creek.

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: mg/l Year
2015
Historical
period of record
High 0.0 0.2
Mean 0.0048 0.0045 0.012879
Low 0.0007 0.0001
No. of Samples 24 430

Five-year Rolling Average

  • Annual Mean

Nitrogen, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2015
Historical
period of record
High 2.0 14.1
Mean 1.4789 1.3295 1.2552634
Low 0.978 0.363
No. of Samples 10 274

Five-year Rolling Average

  • Annual Mean

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2015
Historical
period of record
High 0.5 3.1
Mean 0.2505 0.3068 0.42788834
Low 0.145 0.067
No. of Samples 24 451

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
2015
Historical
period of record
High 81.2 147.7
Mean 35.47 38.38 24.83545
Low 23.40 2.20
No. of Samples 17 547

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2015
Historical
period of record
High 7.0 7.0
Mean 1.18 1.16 0.97687
Low 0.50 0.23
No. of Samples 24 353

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2015
Historical
period of record
High 250.0
Mean 101.09 39.47194
Low 10.00
No. of Samples 0 122

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2015
Historical
period of record
High 490.0 7,000.0
Mean 156.39 83.07 389.79349
Low 83.00 0.02
No. of Samples 24 515

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2015
Historical
period of record
High 1,730.0 14,000.0
Mean 1177.42 1105.5 916.35362
Low 798.00 170.00
No. of Samples 24 499

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2015
Historical
period of record
High 633.0 2,526.0
Mean 198.98 130.25 228.50707
Low 30.00 0.00
No. of Samples 24 463

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2015
Historical
period of record
High 7.9 8.5
Mean 7.21 7.19 0.34414
Low 6.79 4.70
No. of Samples 19 510

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2015
Historical
period of record
High 0.6 35.3
Mean 0.27 1.07 9.28964
Low 0.10 0.00
No. of Samples 17 435

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2015
Historical
period of record
High 1,237.0 52,344.0
Mean 568.0 1274.82 12380.68307
Low 212.00 0.342
No. of Samples 14 583

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2015
Historical
period of record
High 85.3 88.6
Mean 74.65 73.51 7.51308
Low 64.67 49.784
No. of Samples 13 432

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2015
Historical
period of record
High 12.0 117.0
Mean 4.97 7.74 14.88876
Low 1.20 1.20
No. of Samples 24 517

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 2011 2014 Trend
Urban & Built-up 22278% 21976.9% 21976.9% Land Use Trend Sparkline
Rangeland 00% 10.3% 10.3% Land Use Trend Sparkline
Upland Forests 3010.6% 3010.6% 3010.6% Land Use Trend Sparkline
Water 134.4% 145% 145% Land Use Trend Sparkline
Wetlands 10.2% 10.5% 10.5% Land Use Trend Sparkline
Barren Land 51.6% 00% 00% Land Use Trend Sparkline
Transportation and Utilities 155.2% 196.7% 196.7% Land Use Trend Sparkline
Land Use Chart