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

The surface water system in the Catfish Creek Basin has undergone significant alteration over the past century. Historical survey does not identify Catfish Creek by name, but aerial photographs and survey from the mid-1900s clearly show the meandering creek extending inland for over a half mile, narrowing, continuing inland for another mile, and ending at a large wetland. The basin was still relatively undeveloped by the 1970s, but Catfish Creek had been excavated in the developed areas and through the basin, connecting pockets of wetlands to drain low-lying areas. The basin is now highly developed, draining from north to south through a ditch trenched through what is now Palmer Ranch, a master-planned community of residential and commercial development. For basin details see: Little Sarasota Bay Water Quality Management Plan (2012)

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
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.0968 0.0968
Mean 0.0197 0.0159 0.01697522
Low 0.0102 0.0009
No. of Samples 36 164

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 1.428 1.906
Mean 1.0723 1.0501 0.24167199
Low 0.843 0.433
No. of Samples 12 92

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.45 0.63
Mean 0.1009 0.1062 0.08383194
Low 0.038 0.036
No. of Samples 36 164

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
2012
Historical
period of record
High 124.70 172.70
Mean 76.97 89.89 26.81917
Low 26.80 26.80
No. of Samples 33 195

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High 4.53 6.08
Mean 2.0 2.24 1.06756
Low 1.10 0.851
No. of Samples 34 143

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2012
Historical
period of record
High 137.00 549.00
Mean 17.47 44.74 72.03913
Low 8.00 8.00
No. of Samples 36 164

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High 1310.00 1900.00
Mean 1050.6 1033.9 199.07038
Low 836.00 429.00
No. of Samples 36 164

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High 118.00 396.00
Mean 10.29 16.0 67.98869
Low 4.00 4.00
No. of Samples 36 164

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2012
Historical
period of record
High 8.12 8.38
Mean 7.73 7.73 0.3219
Low 7.07 6.97
No. of Samples 33 140

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2012
Historical
period of record
High 0.74 0.87
Mean 0.57 0.51 0.14414
Low 0.33 0.22
No. of Samples 33 139

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2012
Historical
period of record
High 1474.00 12700.00
Mean 1155.97 885.28 1274.77256
Low 690.00 0.958
No. of Samples 33 140

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2012
Historical
period of record
High 84.884 91.148
Mean 76.46 76.11 8.55886
Low 65.624 54.536
No. of Samples 22 115

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2012
Historical
period of record
High 5.70 9.40
Mean 3.97 4.45 1.66564
Low 2.80 1.20
No. of Samples 36 164

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
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.1 0.1
Mean 0.0062 0.0061 0.02456707
Low 0.0009 0.0001
No. of Samples 36 175

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 1.4 5.1
Mean 1.0514 1.1461 0.63541289
Low 0.845 0.131
No. of Samples 12 135

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.5 4.6
Mean 0.1508 0.1724 0.54945484
Low 0.064 0.055
No. of Samples 36 217

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
2012
Historical
period of record
High 175.3 194.0
Mean 86.5 55.95 32.78494
Low 47.90 0.00
No. of Samples 33 304

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High 3.6 8.3
Mean 0.98 1.13 1.24213
Low 0.50 0.50
No. of Samples 34 156

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2012
Historical
period of record
High 300.0
Mean 79.5 45.00974
Low 15.00
No. of Samples 0 136

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2012
Historical
period of record
High 145.0 3,680.0
Mean 33.48 16.79 387.88462
Low 8.00 0.0523
No. of Samples 36 267

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High 1,310.0 4,338.0
Mean 909.52 1023.84 568.58426
Low 724.00 0.00
No. of Samples 36 265

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High 227.0 895.0
Mean 128.18 110.19 129.16914
Low 57.00 0.00
No. of Samples 36 227

Five-year Rolling Average

  • Annual Mean

Oysters

Units: Year
2012
Historical
period of record
High 1,285.0
Mean 77.5
Low 0.00
No. of Samples 5,168

Five-year Rolling Average

pH

Units: None Year
2012
Historical
period of record
High 8.1 8.7
Mean 7.71 7.64 0.30709
Low 7.15 6.05
No. of Samples 33 285

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2012
Historical
period of record
High 1.2 29.5
Mean 0.58 1.38 6.08182
Low 0.27 0.00
No. of Samples 33 211

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2012
Historical
period of record
High 2,241.0 52,500.0
Mean 1175.25 3017.6 13223.6333
Low 560.00 0.561
No. of Samples 33 352

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2012
Historical
period of record
High 86.2 93.2
Mean 76.12 75.15 8.18358
Low 65.282 51.638
No. of Samples 22 252

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2012
Historical
period of record
High 5.2 42.0
Mean 2.66 3.66 5.50606
Low 1.10 0.88
No. of Samples 36 288

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 CAT1 2011 0 0 0 0
2 NC1 2011 89 514 603 85
3 NC2 2011 0 0 0 0

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 2011 2014 Trend
Urban & Built-up 1,71443% 2,69867.7% 2,60365.3% Land Use Trend Sparkline
Agriculture 64316.1% 1293.2% 1132.8% Land Use Trend Sparkline
Rangeland 360.9% 30.1% 30.1% Land Use Trend Sparkline
Upland Forests 86021.6% 1954.9% 2345.9% Land Use Trend Sparkline
Water 1854.6% 3859.7% 3849.6% Land Use Trend Sparkline
Wetlands 44211.1% 40910.3% 43811% Land Use Trend Sparkline
Barren Land 370.9% 00% 00% Land Use Trend Sparkline
Transportation and Utilities 661.7% 1654.1% 2095.2% Land Use Trend Sparkline
Land Use Chart