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

4 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: 12,630 acres
  • Location: Central Sarasota County
  • Discharges into: Blackburn Bay

Although the surface water system in the South Creek Basin has undergone physical changes over the past century, it has been altered less than all of the nearby basins draining to Blackburn Bay or Little Sarasota Bay. The Sarasota County historical and mid-century surveys and aerial photographs show South Creek extending about 2½ miles into the watershed, with a shorter branch joining the south side of the creek. Although the basin was almost entirely undeveloped by the 1970s, the creek had been extended through many wetlands. Today, about 20% of the basin is developed but is isolated in the northwest and southwest portion of the basin. For basin details see: Little Sarasota Bay Water Quality Management Plan (2012)

South Creek

South 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:
  • 1982
  • 1982B
  • 1985
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 0.019 0.0416
Mean 0.0052 0.0046 0.00758526
Low 0.0016 0.0005
No. of Samples 35 221

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 2.185 3.60
Mean 1.1651 1.036 0.59227912
Low 0.596 0.133
No. of Samples 11 168

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 0.194 1.308
Mean 0.1072 0.1763 0.18281278
Low 0.053 0.035
No. of Samples 35 263

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
2013
Historical
period of record
High 96.60 135.60
Mean 50.32 51.87 25.07448
Low 22.10 1.80
No. of Samples 33 333

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2013
Historical
period of record
High 1.97 8.49
Mean 0.86 1.21 1.08979
Low 0.50 0.50
No. of Samples 35 202

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2013
Historical
period of record
High 280.00
Mean 100.93 63.6111
Low 20.00
No. of Samples 0 119

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2013
Historical
period of record
High 186.00 640.00
Mean 62.51 26.34 116.88699
Low 8.00 0.00
No. of Samples 35 316

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2013
Historical
period of record
High 2120.00 2733.00
Mean 1061.22 1060.48 480.67966
Low 519.00 129.00
No. of Samples 35 310

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2013
Historical
period of record
High 371.00 1810.00
Mean 84.78 59.85 247.02246
Low 20.00 0.00
No. of Samples 35 271

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2013
Historical
period of record
High 7.51 8.88
Mean 7.2 7.5 0.27527
Low 6.66 3.00
No. of Samples 33 1,865

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2013
Historical
period of record
High 0.55 38.60
Mean 0.4 10.65 12.08051
Low 0.27 0.00
No. of Samples 33 1,758

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2013
Historical
period of record
High 1105.00 55148.00
Mean 829.66 11392.88 15092.72596
Low 566.00 0.00
No. of Samples 33 1,908

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2013
Historical
period of record
High 84.272 91.886
Mean 72.07 77.54 7.20465
Low 54.158 34.574
No. of Samples 22 1,795

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2013
Historical
period of record
High 8.40 280.00
Mean 4.48 3.95 15.72287
Low 2.00 0.42
No. of Samples 35 326

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

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:
  • 1982A
  • 1992
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold

Chlorophyll a

Units: mg/l Year
2013
Historical
period of record
High 0.0
Mean 0.0055 0.01042251
Low 0.0001
No. of Samples 0 42

Five-year Rolling Average

  • Annual Mean

Nitrogen, Total

Units: mg/l Year
2013
Historical
period of record
High 2.6
Mean 1.0356 0.5517367
Low 0.049
No. of Samples 0 70

Five-year Rolling Average

  • Annual Mean

Phosphorus, Total

Units: mg/l Year
2013
Historical
period of record
High 1.6
Mean 0.3068 0.22696825
Low 0.06
No. of Samples 0 79

Five-year Rolling Average

  • Annual Mean

Dissolved Oxygen Saturation

Units: percent (%) Year
2013
Historical
period of record
High 101.2
Mean 51.02 19.99828
Low 9.00
No. of Samples 0 168

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2013
Historical
period of record
High 8.3
Mean 2.81 2.004
Low 0.78
No. of Samples 0 23

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2013
Historical
period of record
High 280.0
Mean 55.83 63.68175
Low 15.00
No. of Samples 0 126

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2013
Historical
period of record
High 290.0
Mean 5.09 43.08657
Low 0.00
No. of Samples 0 129

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2013
Historical
period of record
High 4,720.0
Mean 1017.45 577.66121
Low 0.00
No. of Samples 0 130

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2013
Historical
period of record
High 430.0
Mean 36.86 92.34682
Low 0.00
No. of Samples 0 91

Five-year Rolling Average

  • Annual Mean

Oysters

Units: Year
2013
Historical
period of record
High 742.0
Mean 68.88
Low 53.00
No. of Samples 963 7,089

Five-year Rolling Average

pH

Units: None Year
2013
Historical
period of record
High 8.8
Mean 7.6 0.36242
Low 5.80
No. of Samples 0 186

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2013
Historical
period of record
High 34.6
Mean 14.91 10.16399
Low 0.00
No. of Samples 0 121

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2013
Historical
period of record
High 54,000.0
Mean 18372.16 16217.39383
Low 230.00
No. of Samples 0 252

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2013
Historical
period of record
High 89.6
Mean 74.92 8.10019
Low 52.70
No. of Samples 0 169

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2013
Historical
period of record
High 23.0
Mean 3.31 3.71898
Low 0.65
No. of Samples 0 144

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...
Most Recent Sarasota County Oyster Monitoring Program Data
Icon Site ID Year Dead Live Total % Live
1 SC1 2013 148 328 476 69
2 SC2 2013 164 323 487 66

Impervious Features

South 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.

6% of the land area within the South Creek Basin is covered by impervious surfaces

Impervious Surface Coverage by Type

Land Use / Land Cover

South 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 South Creek Basin
Land Use Classification 1990 1995 1999 2005 2011 2014 Trend
Urban & Built-up 1,1298.9% 1,36910.8% 1,74513.8% 2,34118.5% 2,54620.2% 2,75621.8% Land Use Trend Sparkline
Agriculture 2,79022.1% 3,03524% 3,10424.6% 3,03124% 3,08824.5% 3,79330% Land Use Trend Sparkline
Rangeland 6495.1% 1,45211.5% 1,72313.6% 1,56512.4% 1,1819.4% 4843.8% Land Use Trend Sparkline
Upland Forests 4,91638.9% 3,58528.4% 2,78922.1% 2,39819% 2,40919.1% 2,15517.1% Land Use Trend Sparkline
Water 2261.8% 5414.3% 4383.5% 6054.8% 6275% 6545.2% Land Use Trend Sparkline
Wetlands 2,55320.2% 2,22517.6% 2,40319% 2,29018.1% 2,32018.4% 2,32118.4% Land Use Trend Sparkline
Barren Land 00% 110.1% 130.1% 100.1% 180.1% 200.2% Land Use Trend Sparkline
Transportation and Utilities 3672.9% 4123.3% 4153.3% 3903.1% 4403.5% 4453.5% Land Use Trend Sparkline
Land Use Chart