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Cow Pen Slough Condition Report for 2015

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Pass

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: 47,518 acres
  • Location: North and central Sarasota County, south Manatee County
  • Discharges into: Dona Bay

The hydrologic boundary of the Cow Pen Slough Basin is indeterminate in many areas due to the flat topography and undefined drainageways. Drainage from the basin is conveyed through 14 miles of improved channel. There are two operational flood control structures on the channel which were designed to provide grade control and water conservation. At present the Cow Pen Slough Basin is primarily rural in nature, with the majority of the land uses being classified as rangeland, crop and pastureland, orchards and groves, and upland forests. There are localized areas that are primarily urban in nature around Bee Ridge and north of Venice, with the majority being classified as residential. For basin details see: Cow Pen Slough Basin Master Plan (USDA Report, 1997)

Creek Location Map

Water Chemistry Ratings - Freshwater Portion of the Creek

Total nitrogen, total phosphorus, chlorophyll a, and dissolved oxygen levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a creek meets the water quality standards mandated by the Clean Water Act. Shown below are water quality data for each freshwater stream segment. Florida law defines a threshold for the maximum allowable concentration of nitrogen, phosphorus, and chlorophyll a, and the minimum required 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:
  • 1924
  • 1924B
  • 1987
  • 1994
  • 1996
  • 2004
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 0.0423 0.243
Mean 0.0099 0.0103 0.01965354
Low 0.0014 0.0006
No. of Samples 48 675

Five-year Rolling Average Graph

      
1/1/20117.9190.0079100mg/l0.0071300
2/1/201113.6590.0107800mg/l0.0130800
3/1/201118.9090.0134900mg/l0.0161900
4/1/20118.3790.0122100mg/l0.0079100
5/1/201123.4390.0144500mg/l0.0126600
6/1/201129.5090.0169600mg/l0.0230800
7/1/201122.5790.0194000mg/l0.0218800
8/1/20115.3390.0180200mg/l0.0052800
9/1/20117.8790.0161800mg/l0.0057900
10/1/20116.2390.0158200mg/l0.0047900
11/1/20116.1090.0129300mg/l0.0057800
12/1/20115.4390.0089200mg/l0.0053100
1/1/201219.5890.0084200mg/l0.0106700
2/1/201242.8790.0146800mg/l0.0282000
3/1/201217.16110.0162300mg/l0.0158600
4/1/201211.3490.0170800mg/l0.0112400
5/1/201228.2560.0207700mg/l0.0222200
6/1/201280.0560.0332100mg/l0.0467900
7/1/20127.5960.0312100mg/l0.0073500
8/1/20125.7660.0250300mg/l0.0054900
9/1/20123.5760.0227600mg/l0.0023700
10/1/20123.7860.0215000mg/l0.0037500
11/1/201220.9960.0202900mg/l0.0175400
12/1/20128.5460.0083700mg/l0.0081700
1/1/20134.8360.0079100mg/l0.0039800
2/1/201318.1560.0099800mg/l0.0180200
3/1/20139.1660.0109100mg/l0.0080000
4/1/201325.6260.0145500mg/l0.0200300
5/1/201311.8580.0130300mg/l0.0117800
6/1/201315.6360.0142100mg/l0.0137200
7/1/20132.6860.0138500mg/l0.0026500
8/1/20134.0860.0115000mg/l0.0038600
9/1/20134.6760.0107600mg/l0.0033100
10/1/201353.7060.0154400mg/l0.0531000
11/1/201324.5540.0175500mg/l0.0243700
12/1/20137.6580.0162200mg/l0.0064500
1/1/20141.1760.0159700mg/l0.0011500
2/1/201410.0280.0169600mg/l0.0095700
3/1/20146.4880.0172600mg/l0.0061500
4/1/20147.6580.0095900mg/l0.0058200
5/1/20145.4180.0064000mg/l0.0044000
6/1/201416.3580.0078500mg/l0.0161300
7/1/20142.2180.0080200mg/l0.0021200
8/1/201412.8080.0084800mg/l0.0124700
9/1/201428.1080.0120900mg/l0.0270800
10/1/20148.0980.0121600mg/l0.0068400
11/1/201418.0080.0142600mg/l0.0178900
12/1/201412.7780.0136600mg/l0.0082600
1/1/201524.8060.0174300mg/l0.0246900
2/1/201515.5660.0178900mg/l0.0071100
3/1/20157.1760.0144000mg/l0.0071600
4/1/20159.9440.0147100mg/l0.0089700
5/1/201510.7040.0134900mg/l0.0105400
6/1/201525.7060.0156500mg/l0.0247800
7/1/20152.9140.0120000mg/l0.0027900
8/1/20151.9240.0097200mg/l0.0018400
9/1/201519.3040.0117500mg/l0.0192700
10/1/20159.4220.0116600mg/l0.0090300
11/1/201532.0520.0152200mg/l0.0303700
Target
mg/l
Threshold
0.02 mg/l
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 1.362 2.73
Mean 1.156 0.9849 0.43348012
Low 0.918 0.15
No. of Samples 8 389

Five-year Rolling Average Graph

      
1/1/2011779.6730.7796700mg/l0.7680700
2/1/2011900.3330.8400000mg/l0.8941000
3/1/20111195.3330.9584400mg/l1.1193900
4/1/20111167.3331.0106700mg/l1.1543100
5/1/20111328.6731.0742700mg/l1.2395000
6/1/20111171.3331.0904400mg/l1.0910200
7/1/20111133.0031.1493300mg/l1.1274600
8/1/20111478.0031.2456100mg/l1.4653300
9/1/20111543.0031.3035600mg/l1.5348000
10/1/20111009.3331.2772200mg/l1.0038700
11/1/2011774.6731.1848900mg/l0.7739200
12/1/2011676.3331.1023900mg/l0.6757200
1/1/2012653.3331.0224400mg/l0.6518300
2/1/2012952.0030.9347800mg/l0.9238300
3/1/2012919.5040.8308600mg/l0.8985400
4/1/20121008.6730.8307500mg/l0.9326400
5/1/2012773.0020.8304700mg/l0.7119900
6/1/20121486.0020.9654200mg/l1.4028900
7/1/20121153.0011.0487000mg/l1.1530000
8/1/20121490.0021.1383600mg/l1.4516200
9/1/20121269.5021.1967000mg/l1.2631800
10/1/20121365.5021.2561700mg/l1.3441500
11/1/2012663.0021.2378300mg/l0.6598100
12/1/2012718.5021.1099200mg/l0.7180500
1/1/2013659.5021.0276700mg/l0.6418600
2/1/2013797.5020.9122500mg/l0.7970900
3/1/2013733.5020.8229200mg/l0.7335000
4/1/2013949.0020.7535000mg/l0.9042400
5/1/2013921.0030.7965000mg/l0.8760900
6/1/20131641.0020.9502500mg/l1.6397500
7/1/20131774.5021.1360800mg/l1.7744200
8/1/20131554.0021.2621700mg/l1.5532000
9/1/20131424.0021.3772500mg/l1.4221800
10/1/20131077.0021.3985800mg/l1.0592000
12/1/2013861.6731.3382300mg/l0.8536500
1/1/2014847.0021.1527300mg/l0.8470000
2/1/2014725.5040.9870300mg/l0.7212400
3/1/2014662.5040.8347300mg/l0.6422600
4/1/2014971.5040.8136300mg/l0.9606900
5/1/2014811.5040.8132800mg/l0.8022000
6/1/20141073.5020.8485800mg/l1.0667200
7/1/20141728.5020.9955000mg/l1.7285000
8/1/20141346.0021.0989200mg/l1.3188500
9/1/20141544.0021.2458300mg/l1.5187700
10/1/20141715.5041.3698300mg/l1.7154500
11/1/20141070.0041.4129200mg/l1.0677100
12/1/20141369.5041.4622500mg/l1.3688700
1/1/2015999.5021.3407500mg/l0.9961700
2/1/20151160.5021.3098300mg/l1.1587600
3/1/20151333.0021.2746700mg/l1.3329500
6/1/20151175.5021.1671300mg/l1.1606100
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 0.416 1.19
Mean 0.176 0.1793 0.16496027
Low 0.069 0.02
No. of Samples 48 725

Five-year Rolling Average Graph

      
1/1/201191.3390.0913300mg/l0.0875500
2/1/2011104.0090.0976700mg/l0.0960900
3/1/2011137.0090.1107800mg/l0.1166500
4/1/2011398.6790.1827500mg/l0.3735700
5/1/2011317.6790.2097300mg/l0.2796900
6/1/2011397.0090.2409500mg/l0.3826200
7/1/2011514.0090.3113900mg/l0.4936700
8/1/2011390.0090.3590600mg/l0.3892000
9/1/2011465.0090.4137200mg/l0.4595000
10/1/2011293.3390.3961700mg/l0.2881500
11/1/2011115.0090.3623900mg/l0.1075700
12/1/201196.6790.3123300mg/l0.0833300
1/1/201266.6790.2377800mg/l0.0595800
2/1/201291.6790.1880600mg/l0.0885900
3/1/2012158.40100.1369600mg/l0.1510400
4/1/2012144.3390.1121200mg/l0.1431500
5/1/2012119.5060.1128700mg/l0.1194200
6/1/2012389.0060.1616000mg/l0.3737100
7/1/2012335.2050.2063500mg/l0.3263200
8/1/2012209.5060.2259900mg/l0.2002700
9/1/2012165.5060.2271700mg/l0.1614200
10/1/2012168.5060.2312000mg/l0.1684600
11/1/201274.0060.2236200mg/l0.0640900
12/1/2012103.5060.1760300mg/l0.1014500
1/1/201374.0060.1325000mg/l0.0740000
2/1/2013102.5060.1146700mg/l0.0957800
3/1/2013127.5060.1083300mg/l0.1255000
4/1/2013104.0060.0975800mg/l0.0927700
5/1/2013156.5770.1113500mg/l0.1446900
6/1/2013340.5060.1508500mg/l0.3401500
7/1/2013274.5060.1842600mg/l0.2744900
8/1/2013252.5060.2092600mg/l0.2524200
9/1/2013202.0060.2216800mg/l0.2019900
10/1/2013172.0060.2330100mg/l0.1695400
11/1/2013262.0040.2505800mg/l0.2606100
12/1/2013108.7170.2119500mg/l0.1055300
1/1/201495.0060.1820400mg/l0.0949900
2/1/201499.0080.1564500mg/l0.0973500
3/1/2014102.0080.1397900mg/l0.1012900
4/1/2014112.0080.1297900mg/l0.1116400
5/1/2014197.5080.1190400mg/l0.1959700
6/1/2014296.0080.1502500mg/l0.2959800
7/1/2014386.0080.1987500mg/l0.3850500
8/1/2014313.0080.2344200mg/l0.1997200
9/1/2014296.0080.2667500mg/l0.2086000
10/1/2014228.0080.2860800mg/l0.2235200
11/1/2014134.0080.2755000mg/l0.1337000
12/1/2014560.0080.3195000mg/l0.5595300
1/1/2015107.0060.2730000mg/l0.1068800
2/1/2015169.0060.2490000mg/l0.1688500
3/1/2015217.0060.2358300mg/l0.2169900
4/1/2015138.0040.2208300mg/l0.1357200
5/1/201599.0040.2150000mg/l0.0943500
6/1/2015207.0060.1561700mg/l0.2066500
7/1/2015349.0040.1965000mg/l0.3425100
8/1/2015287.5040.2162500mg/l0.2637200
9/1/2015223.5040.2173300mg/l0.2219200
10/1/2015138.5020.2174200mg/l0.1366600
11/1/2015165.0020.2284200mg/l0.1644900
Target
mg/l
Threshold
0.49 mg/l
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
2015
Historical
period of record
High 102.10 227.16
Mean 62.39 71.01 31.37267
Low 33.20 2.381
No. of Samples 34 928

Five-year Rolling Average Graph

      
1/1/201184.692484.6900000percent (%)81.7600000
2/1/201197.842491.2700000percent (%)88.1300000
3/1/201178.622487.0500000percent (%)77.0500000
4/1/201176.712484.4700000percent (%)68.0800000
5/1/201148.342477.2400000percent (%)47.4800000
1/1/201296.90996.9000000percent (%)95.5600000
2/1/201267.33982.1200000percent (%)66.8600000
3/1/2012102.00988.7400000percent (%)96.5400000
4/1/201274.83985.2700000percent (%)73.8000000
5/1/201280.00684.2100000percent (%)79.5500000
6/1/201238.95676.6700000percent (%)22.1300000
7/1/201267.29271.7300000percent (%)67.2800000
8/1/201245.55668.1000000percent (%)44.3800000
9/1/201252.90659.9200000percent (%)48.9700000
10/1/201258.10657.1300000percent (%)56.8700000
11/1/201295.50659.7200000percent (%)93.7900000
12/1/201250.50661.6400000percent (%)50.0800000
1/1/201356.60659.8600000percent (%)56.4100000
2/1/201370.35663.9900000percent (%)70.3400000
3/1/201393.10670.6900000percent (%)93.1000000
4/1/2013105.05678.5200000percent (%)97.2800000
5/1/201366.47773.6800000percent (%)65.6000000
6/1/201322.90669.0800000percent (%)22.2300000
7/1/201374.95672.1400000percent (%)73.5800000
8/1/201347.95668.4000000percent (%)47.6700000
9/1/201387.95667.5500000percent (%)87.9500000
10/1/2013110.55668.4600000percent (%)109.0300000
12/1/201375.40779.3600000percent (%)74.5600000
1/1/2014105.03685.3800000percent (%)104.4300000
2/1/2014110.45697.8800000percent (%)110.4500000
3/1/201494.90899.2700000percent (%)94.6900000
4/1/201442.70885.7000000percent (%)42.6100000
5/1/201478.00884.4100000percent (%)75.5200000
6/1/201419.48575.0900000percent (%)17.3200000
7/1/201450.70866.0400000percent (%)50.3200000
8/1/201476.95860.4600000percent (%)76.8900000
9/1/201443.10851.8200000percent (%)42.9300000
10/1/201457.70854.3200000percent (%)57.7000000
11/1/201487.55855.9100000percent (%)87.4400000
12/1/201488.45867.4100000percent (%)82.2400000
1/1/201577.50671.8800000percent (%)74.8700000
2/1/201565.65669.9900000percent (%)63.6300000
3/1/201543.35670.0300000percent (%)42.1400000
6/1/201580.40666.7300000percent (%)79.6600000
7/1/201548.05259.3600000percent (%)47.4800000
8/1/201555.15256.7400000percent (%)53.7000000
9/1/201566.05262.4100000percent (%)62.0400000
10/1/201555.05260.9400000percent (%)54.8900000
11/1/201593.05266.2900000percent (%)92.6100000
Target
percent (%)
Threshold
38.00 percent (%)

BOD, Biochemical oxygen demand

Units: mg/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/20111.4991.4900000mg/l1.4500000
2/1/20111.4691.4800000mg/l1.2200000
3/1/20115.5692.8400000mg/l4.5800000
4/1/20112.0992.6500000mg/l2.0200000
5/1/20112.8192.6800000mg/l2.4300000
6/1/20112.6092.6700000mg/l2.2900000
7/1/20111.9792.7500000mg/l1.6700000
8/1/20111.5692.7700000mg/l1.5200000
9/1/20111.5992.1000000mg/l1.5200000
10/1/20111.2191.9600000mg/l1.1500000
11/1/20110.9291.6400000mg/l0.9000000
12/1/20110.8991.3600000mg/l0.8800000
1/1/20121.0631.2100000mg/l1.0400000
2/1/20122.3291.3300000mg/l2.1600000
3/1/20121.4991.3200000mg/l1.4700000
4/1/20121.5991.3800000mg/l1.5600000
5/1/20122.3961.6200000mg/l2.3800000
6/1/20124.3562.2000000mg/l4.0200000
7/1/20121.6942.3100000mg/l1.6900000
8/1/20121.3262.1400000mg/l1.3200000
9/1/20121.0962.0700000mg/l1.0900000
10/1/20120.6761.9200000mg/l0.6600000
11/1/20120.9361.6800000mg/l0.9200000
12/1/20121.5361.2100000mg/l1.3800000
1/1/20131.6661.2000000mg/l1.2800000
2/1/20132.4261.3800000mg/l1.4700000
3/1/20131.8761.5100000mg/l1.3900000
4/1/20133.2861.9500000mg/l3.1800000
5/1/20132.3772.1900000mg/l2.2400000
6/1/20131.7862.2300000mg/l1.7300000
7/1/20131.2462.1600000mg/l1.2300000
8/1/20131.4362.0000000mg/l1.4200000
9/1/20131.0061.8500000mg/l1.0000000
10/1/20132.4261.7100000mg/l2.4200000
11/1/20134.3842.0400000mg/l4.3700000
12/1/20131.8072.0500000mg/l1.4400000
1/1/20140.5071.9200000mg/l0.5000000
2/1/20142.6082.1200000mg/l2.0900000
3/1/20143.5182.5400000mg/l1.9300000
4/1/20141.5882.4000000mg/l1.5500000
5/1/20140.9281.8200000mg/l0.8200000
6/1/20141.4381.7600000mg/l1.3700000
7/1/20140.9071.8200000mg/l0.9000000
8/1/20141.4081.6200000mg/l1.4000000
9/1/20142.1681.4000000mg/l2.1400000
10/1/20141.1371.3200000mg/l1.1200000
11/1/20141.1281.3600000mg/l1.1200000
12/1/20141.4481.3600000mg/l1.4100000
1/1/20153.0961.7200000mg/l2.7500000
2/1/20151.8861.8000000mg/l1.2800000
3/1/20151.3361.6700000mg/l1.3200000
4/1/20151.4841.7200000mg/l1.3600000
5/1/20151.5641.8000000mg/l1.5500000
6/1/20152.2061.9200000mg/l2.1900000
7/1/20151.0841.5900000mg/l0.9100000
8/1/20150.8541.4200000mg/l0.8400000
9/1/20151.3741.4200000mg/l1.3600000
10/1/20150.9721.3400000mg/l0.9600000

Color

Units: PCU Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Escherichia coli

Units: cfu/100ml Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
4/1/201520.00220.0000000cfu/100ml20.0000000
5/1/201510.00215.0000000cfu/100ml10.0000000
6/1/201520.00216.6700000cfu/100ml20.0000000
7/1/2015110.00240.0000000cfu/100ml110.0000000
8/1/201541.00240.2000000cfu/100ml41.0000000
9/1/201531.00238.6700000cfu/100ml31.0000000
10/1/201510.00137.0000000cfu/100ml10.0000000
11/1/201563.00145.8300000cfu/100ml63.0000000
Target
cfu/100ml
Threshold
cfu/100ml

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/201142.00942.0000000ug/l37.8100000
2/1/201163.67952.8400000ug/l49.0200000
3/1/201157.67954.4500000ug/l47.6500000
4/1/2011205.67992.2500000ug/l157.6700000
5/1/2011104.00994.6000000ug/l76.3200000
6/1/2011115.00998.0000000ug/l57.4500000
7/1/201198.339107.3900000ug/l94.8600000
8/1/201193.339112.3300000ug/l80.5600000
9/1/2011203.339136.6100000ug/l184.1200000
10/1/2011178.339132.0500000ug/l160.0700000
11/1/201167.009125.8900000ug/l46.8900000
12/1/201181.009120.2200000ug/l42.7300000
1/1/201246.009111.5000000ug/l23.0000000
2/1/201276.339108.6700000ug/l46.4000000
3/1/201257.101084.2900000ug/l33.8900000
4/1/2012102.22971.6100000ug/l62.2600000
5/1/201224.00664.4400000ug/l23.4700000
6/1/201264.50661.6900000ug/l36.0300000
7/1/2012113.00572.8600000ug/l107.3200000
8/1/201247.50668.0500000ug/l46.0900000
9/1/201259.00668.3700000ug/l57.5500000
10/1/2012136.50674.0800000ug/l136.5000000
11/1/201212.00672.0800000ug/l11.3100000
12/1/201260.00671.3300000ug/l29.9300000
1/1/201315.00655.0000000ug/l14.9700000
2/1/201327.00651.5800000ug/l19.1800000
3/1/201312.00643.7500000ug/l11.3100000
4/1/201339.00627.5000000ug/l23.6600000
5/1/201312.29727.5500000ug/l11.6600000
6/1/2013104.50634.9700000ug/l104.3000000
7/1/2013138.00655.4700000ug/l137.9400000
8/1/201320.50654.3800000ug/l20.0000000
9/1/20139.50653.9700000ug/l9.3800000
10/1/20138.00648.8000000ug/l8.0000000
11/1/201312.50448.8300000ug/l11.6600000
12/1/201310.86733.2300000ug/l9.5700000
1/1/20146.22911.2600000ug/l1.7200000
2/1/20146.40108.9100000ug/l2.0100000
3/1/201412.40109.4000000ug/l3.4100000
4/1/201446.52815.8200000ug/l7.7700000
5/1/20146.00814.7300000ug/l1.4200000
6/1/201419.601016.1900000ug/l4.5500000
7/1/201462.021025.4900000ug/l19.2900000
8/1/201418.001027.4200000ug/l4.3200000
9/1/201420.411028.7600000ug/l5.8400000
10/1/2014119.631040.9400000ug/l37.2300000
11/1/201446.011047.6100000ug/l14.0400000
12/1/20146.401045.4100000ug/l2.0100000
1/1/20159.00636.5800000ug/l8.9400000
2/1/201530.38838.6400000ug/l22.8100000
3/1/201551.00643.7400000ug/l27.4200000
4/1/20158.00425.1300000ug/l8.0000000
5/1/201538.00423.8000000ug/l23.3200000
6/1/201520.50626.1500000ug/l16.2500000
7/1/201584.80538.7800000ug/l57.8700000
8/1/201549.00441.8800000ug/l26.8300000
9/1/201544.00440.7200000ug/l43.9900000
10/1/201530.00244.3800000ug/l22.3600000
11/1/201510.00239.7200000ug/l9.8000000

Nitrogen, Kjeldahl

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/2011768.339768.3300000ug/l755.9600000
2/1/2011890.679829.5000000ug/l883.9000000
3/1/20111176.339945.1100000ug/l1094.1000000
4/1/20111113.009987.0800000ug/l1101.1400000
5/1/20111223.6791034.4000000ug/l1131.0300000
6/1/20111150.3391053.7200000ug/l1067.6200000
7/1/20111121.3391112.5600000ug/l1115.2900000
8/1/20111396.6791196.8900000ug/l1379.9000000
9/1/20111456.6791243.6100000ug/l1447.0500000
10/1/2011942.0091215.1100000ug/l935.8200000
11/1/2011752.6791136.6100000ug/l751.6700000
12/1/2011661.0091055.0600000ug/l660.5000000
1/1/2012637.009974.3400000ug/l635.7100000
2/1/2012933.679897.1700000ug/l903.3500000
3/1/2012888.0010802.3900000ug/l863.0600000
4/1/2012919.679798.6700000ug/l869.4100000
5/1/2012767.506801.1400000ug/l705.3700000
6/1/20121454.006933.3100000ug/l1366.7800000
7/1/20121672.0051105.8100000ug/l1641.9000000
8/1/20121455.0061192.7000000ug/l1418.2400000
9/1/20121190.0061243.0300000ug/l1183.9300000
10/1/20121192.5061288.5000000ug/l1174.3100000
11/1/2012659.0061270.4200000ug/l655.7900000
12/1/2012693.0061143.5800000ug/l691.4000000
1/1/2013654.506974.0000000ug/l636.4900000
2/1/2013788.506862.9200000ug/l788.2300000
3/1/2013728.506786.0000000ug/l728.4900000
4/1/2013936.506743.3300000ug/l892.5600000
5/1/2013807.577768.1000000ug/l777.8400000
6/1/20131560.006912.6000000ug/l1558.4300000
7/1/20131600.0061070.1800000ug/l1599.9700000
8/1/20131500.0061188.7600000ug/l1499.1700000
9/1/20131360.0061294.0100000ug/l1358.2000000
10/1/20131057.0061314.1000000ug/l1037.3200000
11/1/2013932.5041334.9200000ug/l915.4500000
12/1/2013824.5771212.3500000ug/l817.0200000
1/1/2014736.4371068.4200000ug/l725.5200000
2/1/2014722.508938.8300000ug/l718.2200000
3/1/2014654.508821.2500000ug/l632.7000000
4/1/2014946.008802.7500000ug/l931.6800000
5/1/2014808.508782.0800000ug/l799.1700000
6/1/20141065.008822.1600000ug/l1057.6400000
7/1/20141680.008979.4200000ug/l1680.0000000
8/1/20141300.0081075.6700000ug/l1279.4900000
9/1/20141485.0081214.0800000ug/l1467.8600000
10/1/20141535.0081312.2500000ug/l1529.0500000
11/1/2014987.0081342.0000000ug/l984.9900000
12/1/20141230.0081369.5000000ug/l1229.6300000
1/1/2015980.5061252.9200000ug/l978.0300000
2/1/20151121.2581223.1300000ug/l1118.8700000
3/1/20151285.0061189.7900000ug/l1284.9100000
4/1/2015866.0041078.2900000ug/l863.9200000
5/1/2015770.0041042.1300000ug/l744.1100000
6/1/20151173.5061032.7100000ug/l1158.5900000
7/1/20151288.0051083.9600000ug/l1265.3400000
8/1/20151408.5041131.8300000ug/l1334.1700000
9/1/20151490.0041166.0000000ug/l1489.7000000
10/1/2015828.0021159.6700000ug/l823.9300000
11/1/2015956.5021190.7500000ug/l956.3900000

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/201111.33911.3300000ug/l7.4700000
2/1/20119.67910.5000000ug/l6.9500000
3/1/201119.00913.3300000ug/l14.6400000
4/1/201154.33923.5800000ug/l52.9200000
5/1/2011105.00939.8700000ug/l97.7200000
6/1/201121.00936.7200000ug/l14.1900000
7/1/201111.67936.7800000ug/l10.7000000
8/1/201181.33948.7200000ug/l77.1500000
9/1/201186.33959.9400000ug/l77.9200000
10/1/201167.33962.1100000ug/l66.0800000
11/1/201122.00948.2800000ug/l18.1800000
12/1/201115.33947.3300000ug/l14.4100000
1/1/201216.33948.1100000ug/l10.4500000
2/1/201218.33937.6100000ug/l12.9300000
3/1/201216.601025.9900000ug/l11.4000000
4/1/201289.00929.6000000ug/l24.6600000
5/1/20125.50626.8500000ug/l5.2900000
6/1/201232.00629.6300000ug/l31.4300000
7/1/201255.80536.2100000ug/l55.7700000
8/1/201235.00638.9800000ug/l33.2300000
9/1/201279.50649.4700000ug/l79.2300000
10/1/2012173.00663.4700000ug/l169.8200000
11/1/20124.00663.2200000ug/l4.0000000
12/1/201225.50662.1300000ug/l13.7100000
1/1/20135.00653.6700000ug/l4.9000000
2/1/20139.00649.3300000ug/l7.4800000
3/1/20135.00636.9200000ug/l4.9000000
4/1/201312.50610.1700000ug/l11.6600000
5/1/20134.00610.1700000ug/l4.0000000
6/1/201381.00619.4200000ug/l80.7800000
7/1/2013174.50647.6700000ug/l174.3800000
8/1/201354.00655.1700000ug/l54.0000000
9/1/201364.00665.0000000ug/l63.9700000
10/1/201320.00666.2500000ug/l18.3300000
11/1/201315.50468.1700000ug/l10.3900000
12/1/201319.00757.8300000ug/l12.6700000
1/1/20144.00629.4200000ug/l4.0000000
2/1/20144.00621.0800000ug/l4.0000000
3/1/20148.50611.8300000ug/l7.2100000
4/1/201428.29713.2200000ug/l18.9800000
5/1/20144.00611.3000000ug/l4.0000000
6/1/20148.5069.5500000ug/l7.2100000
7/1/201448.50816.9700000ug/l48.5000000
8/1/201451.57724.8900000ug/l29.1500000
9/1/201466.57734.5700000ug/l31.9500000
10/1/2014180.50859.9400000ug/l133.4800000
11/1/201483.00873.1100000ug/l82.7000000
12/1/2014139.50894.9400000ug/l139.0300000
1/1/201519.00690.0200000ug/l14.7300000
2/1/201562.25891.8000000ug/l61.8400000
3/1/201548.00688.7100000ug/l47.8300000
4/1/201515.00461.1300000ug/l10.2000000
5/1/20154.00447.9600000ug/l4.0000000
6/1/20154.00625.3800000ug/l4.0000000
7/1/201548.00530.2100000ug/l41.9400000
8/1/201580.50433.2500000ug/l79.3600000
9/1/201574.00437.5800000ug/l73.9900000
10/1/2015155.00260.9200000ug/l145.6600000
11/1/201523.50264.1700000ug/l13.1100000

pH

Units: None Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/20116.7396.7300000None6.6900000
2/1/20117.9197.3200000None7.9000000
3/1/20116.8697.1700000None6.8100000
4/1/20117.2097.1800000None7.2000000
5/1/20118.0097.3400000None7.9900000
1/1/20126.8996.8900000None6.8700000
2/1/20127.2597.0700000None7.2400000
3/1/20127.39107.1800000None7.3700000
4/1/20127.0497.1400000None7.0100000
5/1/20128.1467.3400000None8.1200000
6/1/20127.7367.4100000None7.7200000
7/1/20126.8027.3900000None6.8000000
8/1/20127.1667.3800000None7.1600000
9/1/20127.3367.3700000None7.3300000
10/1/20127.1667.3900000None7.1600000
11/1/20127.7467.3200000None7.7400000
12/1/20127.6067.3000000None7.5900000
1/1/20137.6867.4500000None7.6800000
2/1/20137.6267.5200000None7.6100000
3/1/20137.7867.6000000None7.7700000
4/1/20137.8467.7100000None7.8300000
5/1/20137.8277.7200000None7.8100000
6/1/20136.9767.6200000None6.9600000
7/1/20137.1667.5300000None7.1600000
8/1/20137.1867.4600000None7.1700000
9/1/20137.2467.3700000None7.2300000
10/1/20137.4367.3000000None7.4300000
12/1/20137.7377.3500000None7.7200000
1/1/20147.9867.5100000None7.9800000
2/1/20147.7967.6300000None7.7800000
3/1/20147.7967.7400000None7.7900000
4/1/20147.6277.7800000None7.6200000
5/1/20147.4567.7300000None7.4400000
6/1/20147.3247.6600000None7.3200000
7/1/20147.3467.5500000None7.3300000
8/1/20147.4067.4900000None7.3900000
9/1/20147.2267.3900000None7.2200000
10/1/20147.1967.3200000None7.1800000
11/1/20147.5867.3400000None7.5700000
12/1/20147.7087.4100000None7.7000000
1/1/20157.4567.4200000None7.4500000
2/1/20157.32107.4100000None7.3200000
3/1/20157.3567.4300000None7.3400000
6/1/20157.6667.4500000None7.6500000
7/1/20156.9037.3100000None6.8900000
8/1/20157.1527.2700000None7.1400000
9/1/20156.9327.1600000None6.9300000
10/1/20157.4847.2200000None7.4800000
11/1/20157.7047.3000000None7.7000000

Salinity

Units: PSS Year
2015
Historical
period of record
High 27.90 76.50
Mean 1.72 20.94 15.86016
Low 0.13 0.00
No. of Samples 34 3,711

Five-year Rolling Average Graph

      
1/1/20116.3896.3800000PSS1.3700000
2/1/20119.9898.1800000PSS1.7000000
3/1/20119.8098.7200000PSS1.7100000
4/1/20116.9798.2800000PSS1.2600000
5/1/201110.7498.7700000PSS1.5800000
1/1/20120.3390.3300000PSS0.2900000
2/1/201210.7295.5300000PSS1.8500000
3/1/201211.5097.5200000PSS1.8800000
4/1/201211.8498.6000000PSS1.9600000
5/1/201218.33610.5400000PSS3.9900000
6/1/201210.35610.5100000PSS2.7100000
8/1/20120.28610.4600000PSS0.2700000
9/1/20120.3268.2200000PSS0.2500000
10/1/20125.7167.0000000PSS1.7300000
11/1/201215.2566.3800000PSS3.4300000
12/1/201214.5067.2100000PSS3.3800000
1/1/201315.7168.6300000PSS3.5200000
2/1/201315.51611.1700000PSS3.5000000
3/1/201314.37613.5100000PSS3.2000000
4/1/201314.44614.9600000PSS3.1600000
5/1/201314.86614.9000000PSS3.1600000
6/1/20130.24612.5200000PSS0.2300000
7/1/20130.2069.9400000PSS0.2000000
8/1/20130.2167.3900000PSS0.2100000
9/1/20130.1465.0200000PSS0.1300000
10/1/20136.3563.6700000PSS2.1100000
12/1/201313.0563.9900000PSS3.2100000
1/1/20148.8365.7200000PSS1.6000000
2/1/201410.1867.7100000PSS2.7900000
3/1/201412.13810.1100000PSS3.0900000
4/1/20149.28810.6900000PSS2.5900000
5/1/201414.76811.3700000PSS3.0100000
6/1/20142.6059.6300000PSS0.5900000
7/1/20140.3088.2100000PSS0.3000000
8/1/20145.3987.4100000PSS2.3100000
9/1/20143.3785.9500000PSS1.2700000
10/1/20140.2984.4500000PSS0.2800000
11/1/20144.8382.8000000PSS1.8300000
12/1/201413.2684.5700000PSS2.9000000
1/1/201513.1366.7100000PSS3.1400000
2/1/20155.4566.7200000PSS1.5300000
3/1/201514.1068.5100000PSS2.8900000
6/1/201512.72611.3500000PSS3.3200000
7/1/20150.3028.1400000PSS0.2500000
8/1/20150.3126.8600000PSS0.2500000
9/1/20150.2123.3900000PSS0.2100000
10/1/201512.9825.3000000PSS3.0400000
11/1/20158.9225.9100000PSS2.6100000

Specific conductance

Units: umho Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/201110374.67910374.6700000umho2569.5700000
2/1/201115554.33912964.5000000umho3149.4300000
3/1/201115327.00913752.0000000umho3200.7900000
4/1/201111320.00913144.0000000umho2412.9200000
5/1/201116674.33913850.0700000umho2963.0400000
1/1/2012659.009659.0000000umho588.6600000
2/1/201216570.6798614.8400000umho3398.7000000
3/1/201213477.831210235.8300000umho2471.1700000
4/1/201218123.33912207.7100000umho3591.9000000
5/1/201227875.00615341.1700000umho7022.1800000
6/1/201216690.50615566.0600000umho4901.7100000
7/1/2012289.67315504.5000000umho289.5400000
8/1/2012585.00612840.2200000umho562.9800000
9/1/2012664.00610704.5800000umho530.7500000
10/1/20129698.5069300.4500000umho3261.9100000
11/1/201223562.5068581.7000000umho6076.4600000
12/1/201222530.0069554.9500000umho5986.8600000
1/1/201324185.50613537.5800000umho6184.1600000
2/1/201323955.50617432.6700000umho6165.4600000
3/1/201322344.50621046.0800000umho5717.9600000
4/1/201322509.50623181.2500000umho5659.1500000
5/1/201319950.86722579.3100000umho4239.1700000
6/1/2013509.00618909.1400000umho488.7900000
7/1/2013426.00614949.2300000umho425.7000000
8/1/2013438.50611029.7300000umho432.6300000
9/1/2013286.5067353.3900000umho284.5300000
10/1/201310734.5065390.8900000umho3929.3000000
12/1/201317684.4375913.9900000umho4162.7700000
1/1/201417662.8679361.3600000umho4308.4500000
2/1/201416392.00612552.0600000umho5049.1200000
3/1/201419204.50816335.6600000umho5541.9000000
4/1/201415097.00817208.1600000umho4714.4900000
5/1/201422996.50818172.8800000umho5424.7800000
6/1/20144484.00515972.8100000umho1197.5400000
7/1/2014617.00813131.8300000umho614.0800000
8/1/20149310.50811951.5800000umho4337.3400000
9/1/20145997.5089750.4200000umho2458.3800000
10/1/2014600.0087334.2500000umho588.8800000
11/1/20148292.0084883.5000000umho3417.4900000
12/1/201420767.0087597.3300000umho5178.4100000
1/1/201520591.50610926.4200000umho5589.0000000
2/1/20154824.921210178.8200000umho1091.3300000
3/1/201521995.00612845.0700000umho5177.2500000
6/1/201520232.50616910.9800000umho5957.5600000
7/1/2015162.50211803.7300000umho162.4400000
10/1/201520439.00213611.3300000umho5471.6100000
11/1/201514550.50213846.1300000umho4755.3400000

Temperature, water

Units: deg F Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      
1/1/201163.76663.7600000deg F63.7600000
2/1/201169.85666.8100000deg F69.8100000
3/1/201174.61669.4100000deg F74.5900000
4/1/201182.44672.6700000deg F82.4000000
5/1/201184.20674.9700000deg F84.1600000
1/1/201265.94665.9400000deg F65.9100000
2/1/201270.76668.3500000deg F70.7500000
3/1/201276.32871.0100000deg F76.3100000
4/1/201273.03671.5100000deg F73.0100000
5/1/201283.89473.9900000deg F83.8800000
6/1/201282.47475.4000000deg F82.4700000
7/1/201278.35277.4700000deg F78.3500000
8/1/201281.86479.3200000deg F81.8600000
9/1/201282.65480.3800000deg F82.6400000
10/1/201279.71481.4900000deg F79.7000000
11/1/201271.22479.3800000deg F71.2100000
12/1/201272.39477.7000000deg F72.3700000
1/1/201367.42475.8800000deg F67.4000000
2/1/201374.53474.6500000deg F74.4900000
3/1/201372.12472.9000000deg F72.1000000
4/1/201380.55473.0400000deg F80.5300000
5/1/201383.63575.1100000deg F83.5800000
6/1/201384.07477.0500000deg F84.0700000
7/1/201385.62480.0900000deg F85.6200000
8/1/201383.33481.5500000deg F83.3300000
9/1/201379.92482.8500000deg F79.9200000
10/1/201382.99483.2600000deg F82.9800000
12/1/201370.65580.5000000deg F70.6100000
1/1/201462.74575.9300000deg F62.7000000
2/1/201475.70474.4000000deg F75.6800000
3/1/201471.90672.8000000deg F71.8700000
4/1/201475.80671.3600000deg F75.7900000
5/1/201484.09673.4800000deg F84.0500000
6/1/201483.60475.6400000deg F83.5700000
7/1/201484.22679.2200000deg F84.2200000
8/1/201489.31681.4900000deg F89.3100000
9/1/201482.87683.3200000deg F82.8400000
10/1/201479.09683.8600000deg F79.0900000
11/1/201463.29680.4000000deg F63.2800000
12/1/201465.90677.4500000deg F65.7700000
1/1/201566.84474.5500000deg F66.8300000
2/1/201562.82870.1400000deg F62.7500000
3/1/201578.19469.3600000deg F78.1800000
6/1/201589.46474.3300000deg F89.4300000
7/1/201581.28377.9400000deg F81.2800000
8/1/201586.20283.7800000deg F86.2000000
9/1/201582.86284.9500000deg F82.8600000
10/1/201578.43283.6500000deg F78.4300000
11/1/201572.42281.7800000deg F72.4100000

Turbidity

Units: NTU Year
2015
Historical
period of record
High 6.80 48.00
Mean 3.61 2.93 3.33414
Low 1.60 0.40
No. of Samples 48 876

Five-year Rolling Average Graph

      
1/1/20112.8392.8300000NTU2.4500000
2/1/20113.1092.9700000NTU3.0700000
3/1/20117.8394.5900000NTU6.5600000
4/1/20113.2794.2600000NTU3.2300000
5/1/20114.1494.2300000NTU3.1100000
6/1/20113.5094.1100000NTU3.1800000
7/1/20113.5394.2300000NTU3.4300000
8/1/20113.5094.3000000NTU3.5000000
9/1/20113.4393.5600000NTU3.3000000
10/1/20112.8793.5000000NTU2.8000000
11/1/20112.1193.1600000NTU2.0700000
12/1/20111.2292.7800000NTU1.2100000
1/1/20121.8092.4900000NTU1.5400000
2/1/20125.1092.7600000NTU4.3200000
3/1/20123.08102.7000000NTU2.9700000
4/1/20123.2392.7600000NTU3.0000000
5/1/20123.0562.9100000NTU3.0500000
6/1/20125.5063.6300000NTU5.2900000
7/1/20124.4054.0600000NTU4.0900000
8/1/20123.4563.7900000NTU3.4400000
9/1/20124.2563.9800000NTU4.1200000
10/1/20123.6064.0400000NTU3.5300000
11/1/20121.9063.8500000NTU1.8600000
12/1/20121.7063.2200000NTU1.6900000
1/1/20131.8362.7900000NTU1.2000000
2/1/20132.6062.6500000NTU1.8800000
3/1/20133.9062.5900000NTU2.7100000
4/1/20134.8562.8000000NTU4.4800000
5/1/20133.2063.0100000NTU3.0000000
6/1/20134.7063.5100000NTU4.6800000
7/1/20133.8063.8400000NTU3.8000000
8/1/20133.6564.0200000NTU3.6400000
9/1/20135.0064.2000000NTU4.9800000
10/1/20134.2564.1000000NTU4.2500000
11/1/20133.4544.1400000NTU3.4200000
12/1/20133.4173.9300000NTU2.6200000
1/1/20141.6063.5600000NTU1.4700000
2/1/20142.2883.3300000NTU1.8500000
3/1/20143.7583.1200000NTU2.6500000
4/1/20141.8082.7200000NTU1.7700000
5/1/20141.8582.4500000NTU1.5900000
6/1/20142.8082.3500000NTU2.8000000
7/1/20144.8582.8900000NTU4.8100000
8/1/20143.7083.1300000NTU3.6900000
9/1/20147.2583.7100000NTU7.0100000
10/1/20145.6084.3400000NTU5.6000000
11/1/20144.5084.7800000NTU4.5000000
12/1/20143.6584.9300000NTU3.3500000
1/1/20156.1565.1400000NTU6.1200000
2/1/20153.3565.0800000NTU3.1800000
3/1/20153.2564.4200000NTU3.2500000
4/1/20153.3044.0300000NTU3.2900000
5/1/20151.9543.6100000NTU1.9200000
6/1/20154.1563.6900000NTU3.6100000
7/1/20155.9043.6500000NTU5.9000000
8/1/20153.0043.5900000NTU2.7900000
9/1/20153.7043.6700000NTU3.6900000
10/1/20152.9023.6000000NTU2.7900000
11/1/20154.9524.1000000NTU4.8100000
Other Measures of Creek Health

Water Chemistry Ratings - Tidal Portion of the Creek

As is the case for predominantly freshwater streams, total nitrogen, total phosphorus, and chlorophyll a levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a tidally-influenced stream meets the water quality standards mandated by the Clean Water Act. Shown below are water quality data for each saltwater water body within this basin. Florida law defines a threshold for the maximum allowable concentration of chlorophyll a and the minimum required concentration of dissolved oxygen in these streams. No thresholds have been established for the allowable concentration of nitrogen or phosphorus; trend information is provided for these nutrients, to determine whether a statistically significant trend exists and if so, whether levels are rising (bad) or falling (good). Learn more about these ratings and how they are calculated »

Data for the following WBIDs is averaged when compiling the data below:
  • 1924A

Chlorophyll a

Units: mg/l Year
2015
Historical
period of record
High 0.0
Mean 0.0104 0.00359453
Low 0.004
No. of Samples 0 15

Five-year Rolling Average Graph

     
Target
mg/l
Threshold
0.011 mg/l

Nitrogen, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2015
Historical
period of record
High 2.2
Mean 1.0972 0.44363338
Low 0.16
No. of Samples 0 42

Five-year Rolling Average Graph

     

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2015
Historical
period of record
High 0.6
Mean 0.1913 0.11036761
Low 0.043
No. of Samples 0 39

Five-year Rolling Average Graph

     
Target
mg/l
Threshold
mg/l

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources
Units: percent (%) Year
2015
Historical
period of record
High 122.5
Mean 73.4 14.47615
Low 48.1012
No. of Samples 0 128

Five-year Rolling Average Graph

     
Target
percent (%)
Threshold
56.00 percent (%)

BOD, Biochemical oxygen demand

Units: mg/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Color

Units: PCU Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Enterococcus Group Bacteria

Units: cfu/100ml Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
Target
cfu/100ml
Threshold
cfu/100ml

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Nitrogen, Kjeldahl

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Oysters

Units: Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/200778.95178.9500000%78.9500000
1/1/200886.54186.5400000%86.5400000
1/1/200973.24173.2400000%73.2400000
1/1/201083.78183.7800000%83.7800000
1/1/201182.95182.9500000%82.9500000
1/1/201261.24161.2400000%61.2400000
1/1/201337.85137.8500000%37.8500000
1/1/201454.87154.8700000%54.8700000
1/1/201535.14135.1400000%35.1400000

pH

Units: None Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Salinity

Units: PSS Year
2015
Historical
period of record
High 33.5
Mean 11.59 8.63974
Low 0.00
No. of Samples 0 77

Five-year Rolling Average Graph

     

Specific conductance

Units: umho Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Temperature, water

Units: deg F Year
2015
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Turbidity

Units: NTU Year
2015
Historical
period of record
High 11.0
Mean 2.82 1.74921
Low 1.00
No. of Samples 0 109

Five-year Rolling Average Graph

     
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 SKC4 2015 168 91 259 35

Impervious Features

Cow Pen Slough is located within the Sarasota Bay Watershed. View details about the 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.

of the land area within the Cow Pen Slough Basin is covered by impervious surfaces.

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Land Use / Land Cover

Cow Pen Slough is located within the Sarasota Bay Watershed. View details about the 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 »

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Data Sources

The data sources listed below provided water quality data used to create the report on this page. Not all data sources provided data for every creek, and not every Creek Conditions Report used data from all listed data sources. While some data sources have no data for the scored year, they provided period-of-record (historical high, mean, low) data. Click on a data source name to review its metadata.