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
2014
Historical
period of record
High 0.0334 0.0968
Mean 0.0167 0.0162 0.01499976
Low 0.0077 0.0009
No. of Samples 48 247

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2014
Historical
period of record
High 2.064 2.064
Mean 1.2131 1.0722 0.27091546
Low 0.872 0.433
No. of Samples 20 123

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2014
Historical
period of record
High 0.444 0.63
Mean 0.1289 0.1092 0.09450195
Low 0.046 0.036
No. of Samples 48 247

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
2014
Historical
period of record
High 123.90 172.70
Mean 79.69 85.35 27.64504
Low 42.00 26.80
No. of Samples 48 276

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2014
Historical
period of record
High 3.09 6.08
Mean 1.84 2.05 0.98749
Low 1.01 0.851
No. of Samples 48 226

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2014
Historical
period of record
High 120.00 549.00
Mean 3.76 22.81 64.43955
Low 0.008 0.008
No. of Samples 58 257

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2014
Historical
period of record
High 2060.00 2060.00
Mean 1200.47 1059.27 253.23936
Low 870.00 429.00
No. of Samples 48 247

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2014
Historical
period of record
High 197.00 396.00
Mean 15.36 16.18 66.20428
Low 4.00 4.00
No. of Samples 42 241

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2014
Historical
period of record
High 7.88 8.38
Mean 7.63 7.7 0.30329
Low 7.17 6.97
No. of Samples 39 212

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2014
Historical
period of record
High 0.57 0.87
Mean 0.46 0.49 0.13615
Low 0.27 0.22
No. of Samples 48 220

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2014
Historical
period of record
High 1149.00 12700.00
Mean 929.03 908.89 1026.93108
Low 573.00 0.958
No. of Samples 48 221

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2014
Historical
period of record
High 87.638 91.148
Mean 75.28 76.12 8.67806
Low 59.162 54.536
No. of Samples 36 173

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2014
Historical
period of record
High 6.70 9.40
Mean 4.33 4.48 1.58949
Low 2.30 1.20
No. of Samples 48 247

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
2014
Historical
period of record
High 0.0 0.1
Mean 0.0034 0.005 0.02079487
Low 0.0008 0.0001
No. of Samples 47 257

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2014
Historical
period of record
High 1.8 5.1
Mean 1.0488 1.113 0.60009994
Low 0.744 0.131
No. of Samples 20 166

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2014
Historical
period of record
High 0.4 4.6
Mean 0.1438 0.1601 0.47240179
Low 0.051 0.051
No. of Samples 48 300

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
2014
Historical
period of record
High 112.2 194.0
Mean 66.76 56.81 31.21776
Low 36.40 0.00
No. of Samples 48 385

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2014
Historical
period of record
High 1.4 8.3
Mean 0.68 0.95 1.07158
Low 0.50 0.50
No. of Samples 45 236

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2014
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
2014
Historical
period of record
High 581.0 3,680.0
Mean 5.56 13.69 340.03626
Low 0.008 0.008
No. of Samples 58 360

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2014
Historical
period of record
High 1,500.0 4,338.0
Mean 929.13 979.56 525.77007
Low 645.00 0.00
No. of Samples 48 348

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2014
Historical
period of record
High 292.0 895.0
Mean 108.31 109.64 118.40542
Low 55.00 0.00
No. of Samples 48 310

Five-year Rolling Average

  • Annual Mean

Oysters

Units: Year
2014
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
2014
Historical
period of record
High 7.9 8.7
Mean 7.61 7.63 0.28557
Low 7.27 6.05
No. of Samples 39 357

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2014
Historical
period of record
High 0.6 29.5
Mean 0.46 1.01 5.35352
Low 0.28 0.00
No. of Samples 48 292

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2014
Historical
period of record
High 1,145.0 52,500.0
Mean 943.04 2437.19 12382.47683
Low 580.00 0.561
No. of Samples 48 433

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2014
Historical
period of record
High 86.7 93.2
Mean 73.51 74.98 8.34479
Low 56.714 51.638
No. of Samples 36 310

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2014
Historical
period of record
High 4.2 42.0
Mean 1.72 3.03 5.02345
Low 0.70 0.30
No. of Samples 48 371

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 2013 0 0 0 0
2 NC1 2013 116 540 656 82
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 Trend
Urban & Built-up 1,71443% 2,04151.2% 2,47962.2% 2,66766.9% 2,69867.7% 2,60365.3% Land Use Trend Sparkline
Agriculture 64316.1% 55714% 2867.2% 1513.8% 1293.2% 1132.8% Land Use Trend Sparkline
Rangeland 360.9% 220.5% 360.9% 120.3% 30.1% 30.1% Land Use Trend Sparkline
Upland Forests 86021.6% 65016.3% 3157.9% 2185.5% 1954.9% 2345.9% Land Use Trend Sparkline
Water 1854.6% 2736.8% 3759.4% 3759.4% 3859.7% 3849.6% Land Use Trend Sparkline
Wetlands 44211.1% 3719.3% 3909.8% 3899.8% 40910.3% 43811% Land Use Trend Sparkline
Barren Land 370.9% 00% 40.1% 70.2% 00% 00% Land Use Trend Sparkline
Transportation and Utilities 661.7% 701.8% 982.5% 1654.1% 1654.1% 2095.2% Land Use Trend Sparkline
Land Use Chart