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: 3,984 acres
  • Location: North and 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 »

Catfish Creek

Catfish 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:
  • 1984AA
  • 1984B
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: ug/l Year
2024
Historical
period of record
High 23.90 396.00
Mean 11.2849 8.9879 23.58575
Low 3.12 0.10
No. of Samples 18 689

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 1.772 5.13
Mean 1.2618 1.0628 0.46012593
Low 0.853 0.0017
No. of Samples 14 647

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/L Year
2024
Historical
period of record
High 0.312 4.61
Mean 0.165 0.1417 0.24507714
Low 0.098 0.008
No. of Samples 20 654

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 111.247 194.00
Mean 51.26 60.16 30.79877
Low 15.7095 0.00
No. of Samples 20 709

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2024
Historical
period of record
High 3.60 17.50
Mean 1.44 1.38 1.34171
Low 1.00 0.50
No. of Samples 20 565

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2024
Historical
period of record
High 120.00 400.00
Mean 69.96 65.46 34.39269
Low 40.00 15.00
No. of Samples 20 793

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: MPN/100ml Year
2024
Historical
period of record
High 627.00 7270.00
Mean 78.71 60.84 460.09325
Low 20.00 10.00
No. of Samples 20 304

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2024
Historical
period of record
High 0.10 3.68
Mean 0.03 0.02 0.15721719
Low 0.008 0.00
No. of Samples 20 730

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2024
Historical
period of record
High 1.77 4.49
Mean 1.27 1.03 0.44459
Low 0.838 0.00
No. of Samples 20 702

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2024
Historical
period of record
High 0.106 0.895
Mean 0.04 0.04 0.11093138
Low 0.015 0.00
No. of Samples 20 664

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2024
Historical
period of record
High 7.94 9.13
Mean 7.41 7.57 0.43045
Low 7.01 0.42
No. of Samples 20 804

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2024
Historical
period of record
High 0.7604 29.50
Mean 0.52 0.59 3.26302
Low 0.29 0.00
No. of Samples 20 784

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2024
Historical
period of record
High 1496.75 52500.00
Mean 1031.35 1520.31 9711.70891
Low 594.82 0.379
No. of Samples 20 788

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2024
Historical
period of record
High 188.9384 189.4059
Mean 168.78 86.33 36.51489
Low 146.1801 49.28
No. of Samples 20 710

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2024
Historical
period of record
High 54.00
Mean 3.27 4.16941
Low 0.30
No. of Samples 0 533

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:
  • 1984
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
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 CAT1 2013 0 0 0 0
2 NC1 2024 172 129 301 42
3 NC2 2013 0 0 0 0
4 NC2A 2013 21 54 75 72

Impervious Features

Catfish 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.

24% of the land area within the Catfish Creek Basin is covered by impervious surfaces

Impervious Surface Coverage by Type

Land Use / Land Cover

Catfish 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 Catfish Creek Basin
Land Use Classification 1990 1995 1999 2005 2011 2014 2017 2020 Trend
Urban & Built-up 1,71443% 2,04151.2% 2,47962.2% 2,66766.9% 2,69867.7% 2,60365.3% 2,74668.9% 2,77569.6% Land Use Trend Sparkline
Agriculture 64316.1% 55714% 2867.2% 1513.8% 1293.2% 1132.8% 1042.6% 761.9% Land Use Trend Sparkline
Rangeland 360.9% 220.5% 360.9% 120.3% 30.1% 30.1% 30.1% 30.1% Land Use Trend Sparkline
Upland Forests 86021.6% 65016.3% 3157.9% 2185.5% 1954.9% 2345.9% 1724.3% 1634.1% Land Use Trend Sparkline
Water 1854.6% 2736.8% 3759.4% 3759.4% 3859.7% 3849.6% 3899.8% 3789.5% Land Use Trend Sparkline
Wetlands 44211.1% 3719.3% 3909.8% 3899.8% 40910.3% 43811% 40410.2% 42410.6% Land Use Trend Sparkline
Barren Land 370.9% 00% 40.1% 70.2% 00% 00% 00% 00% Land Use Trend Sparkline
Transportation and Utilities 661.7% 701.8% 982.5% 1654.1% 1654.1% 2095.2% 1654.1% 1654.1% Land Use Trend Sparkline
Land Use Chart