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South Creek Condition Report for 2011

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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: 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)

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:
  • 1982
  • 1982B
  • 1985
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 0.0416 0.0416
Mean 0.0058 0.0028 0.00737986
Low 0.0008 0.0005
No. of Samples 12 78

Five-year Trend Graph

      
1/1/20072.2510.0022500mg/l0.0022500
2/1/20072.5010.0023800mg/l0.0025000
3/1/20072.8410.0025300mg/l0.0028400
4/1/20071.6610.0023100mg/l0.0016600
5/1/20071.0010.0020500mg/l0.0010000
6/1/20070.9010.0018600mg/l0.0009000
7/1/20077.7910.0027800mg/l0.0077900
8/1/20070.6110.0024700mg/l0.0006100
9/1/20079.9710.0036600mg/l0.0099700
10/1/200713.6010.0056500mg/l0.0136000
11/1/20071.7410.0057700mg/l0.0017400
12/1/20071.0010.0057900mg/l0.0010000
1/1/20081.6410.0047600mg/l0.0016400
2/1/20081.2410.0048700mg/l0.0012400
3/1/20081.1410.0033900mg/l0.0011400
4/1/20080.8210.0012600mg/l0.0008200
5/1/20081.7610.0012700mg/l0.0017600
6/1/20084.5710.0018600mg/l0.0045700
7/1/20087.6610.0028700mg/l0.0076600
8/1/200810.5010.0044100mg/l0.0105000
9/1/20088.0410.0055600mg/l0.0080400
10/1/20081.9410.0057500mg/l0.0019400
11/1/20080.5210.0055400mg/l0.0005200
12/1/20081.8910.0050900mg/l0.0018900
1/1/20091.9610.0041400mg/l0.0019600
2/1/20091.6010.0026600mg/l0.0016000
3/1/20091.4910.0015700mg/l0.0014900
4/1/20091.1110.0014300mg/l0.0011100
5/1/20091.3310.0015600mg/l0.0013300
6/1/20092.4610.0016600mg/l0.0024600
7/1/20091.3510.0015600mg/l0.0013500
8/1/20093.7310.0019100mg/l0.0037300
9/1/20096.8510.0028100mg/l0.0068500
10/1/20090.8110.0027600mg/l0.0008100
11/1/20092.4610.0029400mg/l0.0024600
12/1/20092.4910.0029500mg/l0.0024900
1/1/20104.7710.0035200mg/l0.0047700
2/1/20103.1510.0034200mg/l0.0031500
3/1/201014.8010.0047500mg/l0.0148000
4/1/20106.6210.0057200mg/l0.0066200
6/1/20103.3010.0065300mg/l0.0033000
7/1/201028.1010.0111900mg/l0.0281000
9/1/201023.4520.0153700mg/l0.0215500
10/1/20103.8510.0146800mg/l0.0038500
11/1/20102.5810.0122600mg/l0.0025800
12/1/20101.5010.0119000mg/l0.0015000
1/1/201141.6010.0146000mg/l0.0416000
2/1/20119.8510.0138100mg/l0.0098500
3/1/20111.1210.0100800mg/l0.0011200
4/1/20110.8410.0095800mg/l0.0008400
5/1/20112.2510.0095300mg/l0.0022500
6/1/201111.3010.0111600mg/l0.0113000
7/1/20115.0010.0050600mg/l0.0050000
8/1/20117.1310.0046100mg/l0.0071300
9/1/201112.8010.0065500mg/l0.0128000
10/1/20115.2110.0072800mg/l0.0052100
11/1/201127.0010.0114100mg/l0.0270000
12/1/20112.2910.0099100mg/l0.0022900
Target
mg/l
Threshold
0.02 mg/l
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 3.60 3.60
Mean 1.5673 1.177 0.56698875
Low 1.072 0.25
No. of Samples 12 121

Five-year Trend Graph

      
1/1/20071239.0011.2390000mg/l1.2390000
2/1/2007838.5011.0387500mg/l0.8385000
3/1/20071082.0011.0531700mg/l1.0820000
4/1/2007910.0011.0173800mg/l0.9100000
5/1/20071064.0011.0267000mg/l1.0640000
6/1/20071181.0011.0524200mg/l1.1810000
7/1/20071035.5011.0185000mg/l1.0355000
8/1/20071007.0011.0465800mg/l1.0070000
9/1/2007838.0011.0059200mg/l0.8380000
10/1/2007948.0011.0122500mg/l0.9480000
11/1/2007958.0010.9945800mg/l0.9580000
12/1/2007503.0010.8815800mg/l0.5030000
1/1/2008586.0010.8066700mg/l0.5860000
2/1/2008504.0010.7228300mg/l0.5040000
3/1/2008590.0010.6815000mg/l0.5900000
4/1/2008877.0010.6696700mg/l0.8770000
5/1/20081102.0010.6936700mg/l1.1020000
6/1/20081815.5010.9124200mg/l1.8155000
7/1/20081022.0010.9850800mg/l1.0220000
8/1/20081843.0011.2082500mg/l1.8430000
9/1/20081892.0011.4252500mg/l1.8920000
10/1/20081063.0011.4562500mg/l1.0630000
11/1/2008638.0011.3789200mg/l0.6380000
12/1/2008936.0011.2323300mg/l0.9360000
1/1/2009814.0011.1976700mg/l0.8140000
2/1/2009770.0011.0188300mg/l0.7700000
3/1/2009916.0010.8561700mg/l0.9160000
4/1/20091124.0010.8663300mg/l1.1240000
5/1/2009781.0010.8901700mg/l0.7810000
6/1/20091083.0010.9146700mg/l1.0830000
7/1/20091051.0010.9541700mg/l1.0510000
8/1/2009901.0010.9760000mg/l0.9010000
9/1/20091027.0010.9945000mg/l1.0270000
10/1/2009924.0010.9611700mg/l0.9240000
11/1/20091199.0011.0308300mg/l1.1990000
12/1/20091335.0011.0728300mg/l1.3350000
1/1/20101812.0011.1996700mg/l1.8120000
2/1/20101822.0011.3531700mg/l1.8220000
3/1/20102663.0011.6258300mg/l2.6630000
4/1/20101394.0011.7041700mg/l1.3940000
6/1/20101182.0011.7746000mg/l1.1820000
7/1/20101632.0011.7386000mg/l1.6320000
9/1/20102011.5021.5548800mg/l2.0067300
10/1/20101315.0011.5351300mg/l1.3150000
11/1/20101231.0011.4743000mg/l1.2310000
12/1/20101208.0011.4795000mg/l1.2080000
1/1/20113600.0011.8731000mg/l3.6000000
2/1/20112680.0012.0075800mg/l2.6800000
3/1/20111072.0011.8510000mg/l1.0720000
4/1/20111153.0011.8240000mg/l1.1530000
5/1/20111121.0011.8056700mg/l1.1210000
6/1/20111666.0011.8820000mg/l1.6660000
7/1/20111522.0011.5356700mg/l1.5220000
8/1/20111582.0011.3526700mg/l1.5820000
9/1/20111807.0011.4751700mg/l1.8070000
10/1/20111324.0011.5036700mg/l1.3240000
11/1/20111444.0011.5575000mg/l1.4440000
12/1/20111186.0011.4775000mg/l1.1860000
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 0.499 1.308
Mean 0.2222 0.2806 0.2275244
Low 0.113 0.039
No. of Samples 11 99

Five-year Trend Graph

      
1/1/2007153.0010.1530000mg/l0.1530000
2/1/2007108.0010.1305000mg/l0.1080000
3/1/2007308.0010.1896700mg/l0.3080000
4/1/2007132.0010.1752500mg/l0.1320000
5/1/2007113.0010.1628000mg/l0.1130000
6/1/2007128.0010.1570000mg/l0.1280000
7/1/200774.0010.1438300mg/l0.0740000
8/1/200790.0010.1408300mg/l0.0900000
9/1/200792.0010.1048300mg/l0.0920000
10/1/2007284.0010.1301700mg/l0.2840000
11/1/2007203.0010.1451700mg/l0.2030000
12/1/200772.0010.1358300mg/l0.0720000
1/1/200854.0010.1325000mg/l0.0540000
2/1/200870.0010.1291700mg/l0.0700000
3/1/200870.0010.1255000mg/l0.0700000
4/1/200866.0010.0891700mg/l0.0660000
5/1/2008371.0010.1171700mg/l0.3710000
6/1/2008122.0010.1255000mg/l0.1220000
7/1/200888.0010.1311700mg/l0.0880000
8/1/2008466.0010.1971700mg/l0.4660000
9/1/2008365.0010.2463300mg/l0.3650000
10/1/200849.0010.2435000mg/l0.0490000
11/1/200839.0010.1881700mg/l0.0390000
12/1/200835.0010.1736700mg/l0.0350000
1/1/200954.0010.1680000mg/l0.0540000
2/1/200958.0010.1000000mg/l0.0580000
3/1/200973.0010.0513300mg/l0.0730000
4/1/2009120.0010.0631700mg/l0.1200000
5/1/200949.0010.0648300mg/l0.0490000
6/1/200988.0010.0736700mg/l0.0880000
7/1/200975.0010.0771700mg/l0.0750000
8/1/200939.0010.0740000mg/l0.0390000
9/1/2009108.0010.0798300mg/l0.1080000
10/1/2009141.0010.0833300mg/l0.1410000
11/1/200961.0010.0853300mg/l0.0610000
12/1/2009174.0010.0996700mg/l0.1740000
1/1/2010168.0010.1151700mg/l0.1680000
2/1/2010174.0010.1376700mg/l0.1740000
3/1/2010341.0010.1765000mg/l0.3410000
4/1/2010332.0010.2083300mg/l0.3320000
6/1/2010222.0010.2474000mg/l0.2220000
7/1/2010248.0010.2634000mg/l0.2480000
9/1/2010344.0020.2865000mg/l0.3352700
10/1/2010171.0010.2462500mg/l0.1710000
11/1/2010110.0010.2190000mg/l0.1100000
12/1/201056.0010.1858000mg/l0.0560000
1/1/2011116.0010.1594000mg/l0.1160000
2/1/2011122.0010.1531700mg/l0.1220000
3/1/2011499.0010.1790000mg/l0.4990000
4/1/2011295.0010.1996700mg/l0.2950000
5/1/2011165.0010.2088300mg/l0.1650000
6/1/2011375.0010.2620000mg/l0.3750000
7/1/2011249.0010.2841700mg/l0.2490000
8/1/2011359.0010.3236700mg/l0.3590000
9/1/2011258.0010.2835000mg/l0.2580000
10/1/2011194.0010.2666700mg/l0.1940000
11/1/2011113.0010.2580000mg/l0.1130000
12/1/201167.0010.2066700mg/l0.0670000
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
2011
Historical
period of record
High 108.90 7042.25
Mean 65.94 49.28 518.54616
Low 20.00 1.80
No. of Samples 5 182

Five-year Trend Graph

      
1/1/200761.90161.9000000percent (%)61.9000000
2/1/2007104.90183.4000000percent (%)104.9000000
3/1/200750.80172.5300000percent (%)50.8000000
4/1/200721.70159.8300000percent (%)21.7000000
5/1/200771.20162.1000000percent (%)71.2000000
6/1/200755.90161.0700000percent (%)55.9000000
7/1/2007135.60173.3500000percent (%)135.6000000
8/1/200723.20159.7300000percent (%)23.2000000
9/1/200725.70155.5500000percent (%)25.7000000
10/1/200743.20159.1300000percent (%)43.2000000
11/1/2007100.60164.0300000percent (%)100.6000000
12/1/200765.90165.7000000percent (%)65.9000000
1/1/200895.90159.0800000percent (%)95.9000000
2/1/200863.60165.8200000percent (%)63.6000000
3/1/200891.50176.7800000percent (%)91.5000000
4/1/200855.70178.8700000percent (%)55.7000000
5/1/200861.90172.4200000percent (%)61.9000000
6/1/200895.40177.3300000percent (%)95.4000000
9/1/200820.90158.4800000percent (%)20.9000000
10/1/200871.80162.5000000percent (%)71.8000000
11/1/200878.10166.5500000percent (%)78.1000000
12/1/200887.20164.5000000percent (%)87.2000000
1/1/200958.30163.2600000percent (%)58.3000000
2/1/200966.70163.8300000percent (%)66.7000000
3/1/200947.20168.2200000percent (%)47.2000000
4/1/200943.10163.4300000percent (%)43.1000000
5/1/200977.50163.3300000percent (%)77.5000000
6/1/200940.30155.5200000percent (%)40.3000000
7/1/200945.10153.3200000percent (%)45.1000000
8/1/200987.20156.7300000percent (%)87.2000000
9/1/200917.10151.7200000percent (%)17.1000000
10/1/200920.90148.0200000percent (%)20.9000000
11/1/200954.90144.2500000percent (%)54.9000000
12/1/200983.30151.4200000percent (%)83.3000000
1/1/201090.40158.9700000percent (%)90.4000000
2/1/2010109.80162.7300000percent (%)109.8000000
3/1/201047.90167.8700000percent (%)47.9000000
4/1/201060.00174.3800000percent (%)60.0000000
9/1/201044.90152.4500000percent (%)44.9000000
11/1/201066.00155.4500000percent (%)66.0000000
12/1/201080.50163.8000000percent (%)80.5000000
1/1/2011108.90175.0800000percent (%)108.9000000
2/1/201199.00179.8600000percent (%)99.0000000
3/1/201155.90182.0600000percent (%)55.9000000
4/1/2011103.40185.6200000percent (%)103.4000000
5/1/201120.00177.9500000percent (%)20.0000000
Target
percent (%)
Threshold
38.00 percent (%)

Rainfall

Units: inches Year
2011
Historical
period of record
High 40.27 45.07
Mean 13.1626315256987
Low 9.28
No. of Samples 364 4,645

Five-year Trend Graph

      
1/1/20071.51311.5100000inches1.5100000
2/1/20072.24282.2400000inches2.2400000
3/1/20070.73310.7300000inches0.7300000
4/1/20072.68292.6800000inches2.6800000
5/1/20070.12310.1200000inches0.1200000
6/1/20073.59303.5900000inches3.5900000
7/1/20076.66316.6600000inches6.6600000
8/1/20073.65313.6500000inches3.6500000
9/1/20074.64304.6400000inches4.6400000
10/1/20070.41200.4100000inches0.4100000
11/1/20070.10300.1000000inches0.1000000
12/1/20070.72310.7200000inches0.7200000
1/1/20081.30311.3000000inches1.3000000
2/1/20081.05291.0500000inches1.0500000
3/1/20081.86311.8600000inches1.8600000
4/1/20083.77303.7700000inches3.7700000
5/1/20080.94310.9400000inches0.9400000
6/1/20084.05304.0500000inches4.0500000
7/1/20086.62316.6200000inches6.6200000
8/1/20087.16317.1600000inches7.1600000
9/1/20086.77306.7700000inches6.7700000
10/1/20083.82313.8200000inches3.8200000
11/1/20080.51300.5100000inches0.5100000
12/1/20081.43311.4300000inches1.4300000
1/1/20090.65310.6500000inches0.6500000
2/1/20090.44280.4400000inches0.4400000
3/1/20090.98310.9800000inches0.9800000
4/1/20091.04301.0400000inches1.0400000
5/1/20094.15314.1500000inches4.1500000
6/1/20095.76305.7600000inches5.7600000
7/1/20093.09313.0900000inches3.0900000
8/1/20094.04314.0400000inches4.0400000
9/1/20095.06305.0600000inches5.0600000
10/1/20090.62310.6200000inches0.6200000
11/1/20093.11303.1100000inches3.1100000
12/1/20093.11313.1100000inches3.1100000
1/1/20102.59312.5900000inches2.5900000
2/1/20102.31282.3100000inches2.3100000
3/1/20106.17316.1700000inches6.1700000
4/1/20102.08302.0800000inches2.0800000
5/1/20100.92310.9200000inches0.9200000
6/1/20102.72302.7200000inches2.7200000
7/1/20104.67314.6700000inches4.6700000
8/1/20107.50317.5000000inches7.5000000
9/1/20102.11302.1100000inches2.1100000
10/1/20100.00310.0000000inches0.0000000
11/1/20100.65300.6500000inches0.6500000
12/1/20100.77310.7700000inches0.7700000
1/1/20112.30312.3000000inches2.3000000
2/1/20110.42280.4200000inches0.4200000
3/1/20117.58317.5800000inches7.5800000
4/1/20110.92300.9200000inches0.9200000
5/1/20112.43312.4300000inches2.4300000
6/1/20112.32302.3200000inches2.3200000
7/1/20116.64316.6400000inches6.6400000
8/1/20119.30319.3000000inches9.3000000
9/1/20115.29305.2900000inches5.2900000
10/1/20111.18311.1800000inches1.1800000
11/1/20111.76301.7600000inches1.7600000
12/1/20110.13300.1300000inches0.1300000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2011
Historical
period of record
High 0.67 38.60
Mean 0.55 12.62 11.60991
Low 0.44 0.00
No. of Samples 5 1,648

Five-year Trend Graph

      
1/1/20070.4510.4500000PSS0.4500000
2/1/20070.4210.4400000PSS0.4200000
3/1/20070.4510.4400000PSS0.4500000
4/1/200718.6815.0000000PSS18.6800000
5/1/20070.4414.0900000PSS0.4400000
6/1/20070.4313.4800000PSS0.4300000
7/1/20070.4713.4800000PSS0.4700000
8/1/20070.4913.4900000PSS0.4900000
9/1/20070.4213.4900000PSS0.4200000
10/1/20070.2710.4200000PSS0.2700000
11/1/20070.5010.4300000PSS0.5000000
12/1/20070.5410.4500000PSS0.5400000
1/1/20080.5110.4600000PSS0.5100000
2/1/20080.6610.4800000PSS0.6600000
3/1/20080.5810.5100000PSS0.5800000
4/1/20080.5010.5500000PSS0.5000000
5/1/20080.5910.5600000PSS0.5900000
6/1/200826.5714.9000000PSS26.5700000
9/1/20080.2516.9800000PSS0.2500000
10/1/20080.4216.9600000PSS0.4200000
11/1/20080.4616.9300000PSS0.4600000
12/1/20080.4510.4000000PSS0.4500000
1/1/20090.4810.4100000PSS0.4800000
2/1/20090.4910.4300000PSS0.4900000
3/1/20090.4210.4500000PSS0.4200000
4/1/20090.4710.4600000PSS0.4700000
5/1/20090.4410.4600000PSS0.4400000
6/1/20090.4910.4700000PSS0.4900000
7/1/20090.5310.4700000PSS0.5300000
8/1/20090.4910.4700000PSS0.4900000
9/1/20090.3710.4700000PSS0.3700000
10/1/20090.4610.4600000PSS0.4600000
11/1/20090.4410.4600000PSS0.4400000
12/1/20090.4410.4600000PSS0.4400000
1/1/20100.4710.4500000PSS0.4700000
2/1/20100.4710.4400000PSS0.4700000
3/1/20100.2910.4300000PSS0.2900000
4/1/20100.4210.4200000PSS0.4200000
9/1/20100.3010.3600000PSS0.3000000
11/1/20100.5110.4100000PSS0.5100000
12/1/20100.5210.4400000PSS0.5200000
1/1/20110.5610.4700000PSS0.5600000
2/1/20110.6710.5100000PSS0.6700000
3/1/20110.6610.5800000PSS0.6600000
4/1/20110.4410.5600000PSS0.4400000
5/1/20110.4810.5600000PSS0.4800000

Turbidity

Units: NTU Year
2011
Historical
period of record
High 6.10 280.00
Mean 3.11 4.16 20.84467
Low 1.20 0.42
No. of Samples 12 183

Five-year Trend Graph

      
1/1/200711.50111.5000000NTU11.5000000
2/1/20073.7017.6000000NTU3.7000000
3/1/200710.7018.6300000NTU10.7000000
4/1/20078.7018.6500000NTU8.7000000
5/1/20073.8017.6800000NTU3.8000000
6/1/20072.5016.8200000NTU2.5000000
7/1/20072.1015.2500000NTU2.1000000
8/1/20070.7514.7600000NTU0.7500000
9/1/20071.6013.2400000NTU1.6000000
10/1/20072.8012.2600000NTU2.8000000
11/1/20071.4211.8600000NTU1.4200000
12/1/20076.0012.4500000NTU6.0000000
1/1/20081.6512.3700000NTU1.6500000
2/1/20081.1912.4400000NTU1.1900000
3/1/20081.3412.4000000NTU1.3400000
4/1/20080.8712.0800000NTU0.8700000
5/1/20080.5211.9300000NTU0.5200000
6/1/20082.5011.3500000NTU2.5000000
7/1/20080.8111.2100000NTU0.8100000
8/1/20081.9011.3200000NTU1.9000000
9/1/20085.3011.9800000NTU5.3000000
10/1/20081.6712.1200000NTU1.6700000
11/1/20081.4912.2800000NTU1.4900000
12/1/20081.2912.0800000NTU1.2900000
1/1/20092.0012.2800000NTU2.0000000
2/1/20091.7112.2400000NTU1.7100000
3/1/20091.0711.5400000NTU1.0700000
4/1/20090.8911.4100000NTU0.8900000
5/1/20090.6711.2700000NTU0.6700000
6/1/20090.8111.1900000NTU0.8100000
7/1/20090.4210.9300000NTU0.4200000
8/1/20090.8910.7900000NTU0.8900000
9/1/20091.4010.8500000NTU1.4000000
10/1/20092.2011.0700000NTU2.2000000
11/1/20091.3711.1800000NTU1.3700000
12/1/20091.6911.3300000NTU1.6900000
1/1/20101.2011.4600000NTU1.2000000
2/1/20101.7011.5900000NTU1.7000000
3/1/20105.0012.1900000NTU5.0000000
4/1/20103.1012.3400000NTU3.1000000
6/1/20102.2012.6400000NTU2.2000000
7/1/20104.8013.3600000NTU4.8000000
9/1/20105.8523.9900000NTU5.8100000
10/1/201011.9016.1900000NTU11.9000000
11/1/20108.9016.7300000NTU8.9000000
12/1/20107.5017.7900000NTU7.5000000
1/1/20115.0017.8300000NTU5.0000000
2/1/20113.9017.1800000NTU3.9000000
3/1/20111.8316.5100000NTU1.8300000
4/1/20112.8014.9900000NTU2.8000000
5/1/20111.6013.7700000NTU1.6000000
6/1/20114.1013.2100000NTU4.1000000
7/1/20111.2012.5700000NTU1.2000000
8/1/20113.1012.4400000NTU3.1000000
9/1/20112.5012.5500000NTU2.5000000
10/1/20115.7013.0300000NTU5.7000000
11/1/20116.1013.7800000NTU6.1000000
12/1/20113.8013.7300000NTU3.8000000
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:
  • 1982A
  • 1992

Chlorophyll a

Units: mg/l Year
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20072.8210.0028200mg/l0.0028200
2/1/20072.7810.0028000mg/l0.0027800
3/1/20074.2310.0032800mg/l0.0042300
4/1/20072.3710.0030500mg/l0.0023700
5/1/20074.1210.0032600mg/l0.0041200
6/1/20073.3810.0032800mg/l0.0033800
7/1/200714.8010.0052800mg/l0.0148000
8/1/20076.2210.0058500mg/l0.0062200
9/1/20077.0210.0063200mg/l0.0070200
10/1/200711.3010.0078100mg/l0.0113000
11/1/200712.3010.0091700mg/l0.0123000
12/1/20074.5110.0093600mg/l0.0045100
1/1/200810.1030.0085800mg/l0.0098800
2/1/200813.1650.0097300mg/l0.0099700
3/1/200818.2930.0116100mg/l0.0140900
4/1/200812.2530.0117700mg/l0.0093500
5/1/20084.3910.0104500mg/l0.0043900
6/1/20088.2020.0110700mg/l0.0080000
7/1/20088.1520.0107400mg/l0.0071800
8/1/200821.5010.0121300mg/l0.0215000
9/1/20084.6520.0098600mg/l0.0045300
10/1/200822.0020.0114800mg/l0.0169700
11/1/200815.5020.0133300mg/l0.0154900
12/1/20087.2820.0131800mg/l0.0027700
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
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/2007307.0010.3070000mg/l0.3070000
2/1/2007595.0010.4510000mg/l0.5950000
3/1/2007392.0010.4313300mg/l0.3920000
4/1/2007195.0010.3722500mg/l0.1950000
5/1/2007364.0010.3706000mg/l0.3640000
6/1/2007318.0010.3618300mg/l0.3180000
7/1/2007517.0010.3968300mg/l0.5170000
8/1/2007374.0010.3600000mg/l0.3740000
9/1/2007925.0010.4488300mg/l0.9250000
10/1/2007958.0010.5760000mg/l0.9580000
11/1/2007322.5010.5690800mg/l0.3225000
12/1/2007230.0010.5544200mg/l0.2300000
1/1/2008569.0030.5630800mg/l0.4766600
2/1/2008844.0050.6414200mg/l0.7044000
3/1/2008859.0030.6304200mg/l0.5694100
4/1/2008703.0030.5879200mg/l0.6678600
5/1/2008189.0010.5656700mg/l0.1890000
6/1/2008674.0020.6396700mg/l0.6728100
7/1/20081009.5020.7130800mg/l0.9903900
8/1/2008982.0010.7360800mg/l0.9820000
9/1/20081230.5020.7980000mg/l1.2246800
10/1/2008943.5020.8380800mg/l0.8719100
11/1/2008972.0020.9685800mg/l0.9621500
12/1/20081302.0021.0732500mg/l1.2674400

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/200797.0010.0970000mg/l0.0970000
2/1/2007151.0010.1240000mg/l0.1510000
3/1/2007183.0010.1436700mg/l0.1830000
4/1/2007105.0010.1340000mg/l0.1050000
5/1/2007120.0010.1312000mg/l0.1200000
6/1/2007192.0010.1413300mg/l0.1920000
7/1/2007226.0010.1628300mg/l0.2260000
8/1/200796.0010.1536700mg/l0.0960000
9/1/2007182.0010.1535000mg/l0.1820000
10/1/2007219.0010.1725000mg/l0.2190000
11/1/2007140.0010.1758300mg/l0.1400000
12/1/2007126.0010.1648300mg/l0.1260000
1/1/2008186.0030.1581700mg/l0.1494900
2/1/2008278.0050.1885000mg/l0.2339000
3/1/2008260.3330.2015600mg/l0.1859100
4/1/2008146.6730.1895000mg/l0.1397600
5/1/200865.0010.1770000mg/l0.0650000
6/1/2008205.0020.1901700mg/l0.2019900
7/1/2008425.0020.2300000mg/l0.2959700
8/1/2008251.0010.2255000mg/l0.2510000
9/1/2008325.0020.2362800mg/l0.3075700
10/1/2008238.0020.2515000mg/l0.1910000
11/1/2008265.0020.2848300mg/l0.2645800
12/1/2008315.0020.3031700mg/l0.3117700
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
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/200761.40161.4000000percent (%)61.4000000
2/1/2007126.10193.7500000percent (%)126.1000000
3/1/200760.60182.7000000percent (%)60.6000000
5/1/200799.50186.9000000percent (%)99.5000000
6/1/200784.30186.3800000percent (%)84.3000000
7/1/200785.50191.2000000percent (%)85.5000000
8/1/200784.20182.8200000percent (%)84.2000000
9/1/200726.60176.0200000percent (%)26.6000000
10/1/200763.20173.8800000percent (%)63.2000000
11/1/200773.50169.5500000percent (%)73.5000000
12/1/200796.20171.5300000percent (%)96.2000000
1/1/200866.50368.3700000percent (%)49.1500000
2/1/200850.80562.8000000percent (%)48.3700000
3/1/200842.70265.4800000percent (%)41.5800000
4/1/200856.33364.3400000percent (%)56.0600000
5/1/200864.10162.7700000percent (%)64.1000000
6/1/200840.95253.5600000percent (%)37.1400000
7/1/200824.90246.6300000percent (%)24.8900000
8/1/200836.10144.1800000percent (%)36.1000000
9/1/200817.00439.9000000percent (%)16.0700000
10/1/200845.75238.1300000percent (%)39.6900000
11/1/200857.40237.0200000percent (%)48.0500000
12/1/200847.55238.1200000percent (%)38.6100000
Target
percent (%)
Threshold
56.00 percent (%)

Oysters

Units: Year
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20030.0010.0000000%0.0000000
1/1/200658.10258.1000000%58.1000000
1/1/200775.54275.5400000%75.5400000
1/1/200875.30275.3000000%75.3000000
1/1/200967.92267.9200000%67.9200000
1/1/201074.25274.2500000%74.2500000
1/1/201179.85279.8500000%79.8500000

Rainfall

Units: inches Year
2011
Historical
period of record
High 40.3 45.1
Mean 13.1626315256987
Low 9.28
No. of Samples 364 4,645

Five-year Trend Graph

     
1/1/20071.51311.5100000inches1.5100000
2/1/20072.24282.2400000inches2.2400000
3/1/20070.73310.7300000inches0.7300000
4/1/20072.68292.6800000inches2.6800000
5/1/20070.12310.1200000inches0.1200000
6/1/20073.59303.5900000inches3.5900000
7/1/20076.66316.6600000inches6.6600000
8/1/20073.65313.6500000inches3.6500000
9/1/20074.64304.6400000inches4.6400000
10/1/20070.41200.4100000inches0.4100000
11/1/20070.10300.1000000inches0.1000000
12/1/20070.72310.7200000inches0.7200000
1/1/20081.30311.3000000inches1.3000000
2/1/20081.05291.0500000inches1.0500000
3/1/20081.86311.8600000inches1.8600000
4/1/20083.77303.7700000inches3.7700000
5/1/20080.94310.9400000inches0.9400000
6/1/20084.05304.0500000inches4.0500000
7/1/20086.62316.6200000inches6.6200000
8/1/20087.16317.1600000inches7.1600000
9/1/20086.77306.7700000inches6.7700000
10/1/20083.82313.8200000inches3.8200000
11/1/20080.51300.5100000inches0.5100000
12/1/20081.43311.4300000inches1.4300000
1/1/20090.65310.6500000inches0.6500000
2/1/20090.44280.4400000inches0.4400000
3/1/20090.98310.9800000inches0.9800000
4/1/20091.04301.0400000inches1.0400000
5/1/20094.15314.1500000inches4.1500000
6/1/20095.76305.7600000inches5.7600000
7/1/20093.09313.0900000inches3.0900000
8/1/20094.04314.0400000inches4.0400000
9/1/20095.06305.0600000inches5.0600000
10/1/20090.62310.6200000inches0.6200000
11/1/20093.11303.1100000inches3.1100000
12/1/20093.11313.1100000inches3.1100000
1/1/20102.59312.5900000inches2.5900000
2/1/20102.31282.3100000inches2.3100000
3/1/20106.17316.1700000inches6.1700000
4/1/20102.08302.0800000inches2.0800000
5/1/20100.92310.9200000inches0.9200000
6/1/20102.72302.7200000inches2.7200000
7/1/20104.67314.6700000inches4.6700000
8/1/20107.50317.5000000inches7.5000000
9/1/20102.11302.1100000inches2.1100000
10/1/20100.00310.0000000inches0.0000000
11/1/20100.65300.6500000inches0.6500000
12/1/20100.77310.7700000inches0.7700000
1/1/20112.30312.3000000inches2.3000000
2/1/20110.42280.4200000inches0.4200000
3/1/20117.58317.5800000inches7.5800000
4/1/20110.92300.9200000inches0.9200000
5/1/20112.43312.4300000inches2.4300000
6/1/20112.32302.3200000inches2.3200000
7/1/20116.64316.6400000inches6.6400000
8/1/20119.30319.3000000inches9.3000000
9/1/20115.29305.2900000inches5.2900000
10/1/20111.18311.1800000inches1.1800000
11/1/20111.76301.7600000inches1.7600000
12/1/20110.13300.1300000inches0.1300000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/200730.12130.1200000PSS30.1200000
2/1/200725.18127.6500000PSS25.1800000
3/1/200732.24129.1800000PSS32.2400000
4/1/20070.00121.8900000PSS0
5/1/20070.00117.5100000PSS0
6/1/200735.05120.4300000PSS35.0500000
7/1/200729.46120.3200000PSS29.4600000
8/1/200734.53121.8800000PSS34.5300000
9/1/200723.68120.4500000PSS23.6800000
10/1/20070.65120.5600000PSS0.6500000
11/1/200730.52125.6500000PSS30.5200000
12/1/200733.25125.3500000PSS33.2500000
1/1/200831.35325.6600000PSS31.2100000
2/1/200829.87524.8900000PSS29.5100000
3/1/200827.41225.5100000PSS26.5600000
4/1/200831.95330.7300000PSS31.9100000
5/1/200836.52131.7300000PSS36.5200000
6/1/200833.35231.7400000PSS33.3400000
7/1/200818.21229.5500000PSS15.7900000
8/1/20087.91125.8900000PSS7.9100000
9/1/200816.46424.0700000PSS14.5500000
10/1/200828.44223.4800000PSS28.4200000
11/1/200830.86222.5400000PSS30.8300000
12/1/200828.82221.7800000PSS28.5900000

Turbidity

Units: NTU Year
2011
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20073.5013.5000000NTU3.5000000
2/1/20072.9013.2000000NTU2.9000000
3/1/20073.4013.2700000NTU3.4000000
4/1/20072.0012.9500000NTU2.0000000
5/1/20072.8012.9200000NTU2.8000000
6/1/20072.6012.8700000NTU2.6000000
7/1/20074.0012.9500000NTU4.0000000
8/1/20072.5012.8800000NTU2.5000000
9/1/20072.0012.6500000NTU2.0000000
10/1/20074.8013.1200000NTU4.8000000
11/1/20073.6013.2500000NTU3.6000000
12/1/20072.7013.2700000NTU2.7000000
1/1/20087.5333.8600000NTU6.2400000
2/1/200810.6455.2100000NTU8.3400000
3/1/20087.4736.1200000NTU6.2600000
4/1/20084.8336.1300000NTU4.2600000
5/1/20082.2015.9000000NTU2.2000000
6/1/200814.0027.7800000NTU12.6500000
7/1/20087.7027.8100000NTU7.7000000
8/1/20082.9016.5200000NTU2.9000000
9/1/20083.5525.8600000NTU3.5100000
10/1/20088.6526.5000000NTU7.4800000
11/1/20088.9027.6200000NTU6.4800000
12/1/200811.8327.2600000NTU3.8700000
Other Measures of Creek Health

Oysters

Because they are immobile and will tolerate a fairly wide salinity range, eastern oysters (Crassotrea 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 2011 90 352 442 80
2 SC2 2011 131 524 655 80

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.

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

Loading interactive chart...

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 »

Loading interactive chart...

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.