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North Creek Condition Report for 2013

View 2011 Report

Caution

3 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: 2,327 acres
  • Location: Central Sarasota County
  • Discharges into: Little Sarasota Bay

The surface water system in the North Creek Basin has undergone significant alteration over the past century. The 1847 General Land Office Survey shows North Creek extending from Little Sarasota Bay, east across the approximately 2½-mile-wide basin to what appears to be a pond. The 1959 USDA NRCS Soil Survey shows two north-south ditches leading to North Creek. The ditch to the south leads to an area in the west that appears to be a development. With the exception of the western boundary, U.S. 41, and some ditches, the basin was still fairly undeveloped by the 1970s. By 2000, roughly half of the basin was developed and about 1,930 people resided in the developed areas (U.S. Census Bureau, 2000). Today, about 75% of the basin is developed and laden with ditches and stormwater infrastructure, with half of the development residential. 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:
  • 1984AB

Chlorophyll a

Units: mg/l Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      
Target
mg/l
Threshold
0.02 mg/l

Nitrogen, Total

Units: mg/l Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      

Phosphorus, Total

Units: mg/l Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      
Target
mg/l
Threshold
0.49 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
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      
Target
percent (%)
Threshold
38.00 percent (%)

Rainfall

Units: inches Year
2013
Historical
period of record
High 40.16 45.71
Mean 10.8680411864682
Low 8.47
No. of Samples 360 4,798

Five-year Trend Graph

      
1/1/20090.78310.7800000inches0.7800000
2/1/20090.51280.5100000inches0.5100000
3/1/20090.97310.9700000inches0.9700000
4/1/20091.56301.5600000inches1.5600000
5/1/20095.03315.0300000inches5.0300000
6/1/20096.05306.0500000inches6.0500000
7/1/20093.94313.9400000inches3.9400000
8/1/20095.30315.3000000inches5.3000000
9/1/20095.46305.4600000inches5.4600000
10/1/20092.01312.0100000inches2.0100000
11/1/20094.28304.2800000inches4.2800000
12/1/20094.71314.7100000inches4.7100000
1/1/20103.48313.4800000inches3.4800000
2/1/20102.24282.2400000inches2.2400000
3/1/20107.87317.8700000inches7.8700000
4/1/20103.70303.7000000inches3.7000000
5/1/20101.26311.2600000inches1.2600000
6/1/20103.27303.2700000inches3.2700000
7/1/20105.13315.1300000inches5.1300000
8/1/20107.59317.5900000inches7.5900000
9/1/20102.90302.9000000inches2.9000000
10/1/20100.00310.0000000inches0.0000000
11/1/20100.65300.6500000inches0.6500000
12/1/20100.82310.8200000inches0.8200000
1/1/20112.37312.3700000inches2.3700000
2/1/20110.52280.5200000inches0.5200000
3/1/20118.87318.8700000inches8.8700000
4/1/20111.20301.2000000inches1.2000000
5/1/20112.29312.2900000inches2.2900000
6/1/20112.52302.5200000inches2.5200000
7/1/20116.45316.4500000inches6.4500000
8/1/20117.32317.3200000inches7.3200000
9/1/20114.92304.9200000inches4.9200000
10/1/20111.30311.3000000inches1.3000000
11/1/20111.95301.9500000inches1.9500000
12/1/20110.13300.1300000inches0.1300000
1/1/20120.57290.5700000inches0.5700000
2/1/20121.02291.0200000inches1.0200000
3/1/20121.44311.4400000inches1.4400000
4/1/20121.86241.8600000inches1.8600000
5/1/20122.55312.5500000inches2.5500000
6/1/201211.543011.5400000inches11.5400000
7/1/20126.86316.8600000inches6.8600000
8/1/20126.22316.2200000inches6.2200000
9/1/20124.71304.7100000inches4.7100000
10/1/20121.78311.7800000inches1.7800000
11/1/20120.13280.1300000inches0.1300000
12/1/20122.32312.3200000inches2.3200000
1/1/20130.42310.4200000inches0.4200000
2/1/20131.17231.1700000inches1.1700000
3/1/20131.41311.4100000inches1.4100000
4/1/20133.11303.1100000inches3.1100000
5/1/20132.19312.1900000inches2.1900000
6/1/20137.27307.2700000inches7.2700000
7/1/20137.39317.3900000inches7.3900000
8/1/20137.77317.7700000inches7.7700000
9/1/20136.52306.5200000inches6.5200000
10/1/20131.05311.0500000inches1.0500000
11/1/20131.56301.5600000inches1.5600000
12/1/20130.30310.3000000inches0.3000000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      

Turbidity

Units: NTU Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

      
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:
  • 1984A
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 0.0 0.1
Mean 0.0094 0.0102 0.01138793
Low 0.0026 0.0009
No. of Samples 11 121

Five-year Trend Graph

     
1/1/200947.6010.0476000mg/l0.0476000
2/1/200928.8010.0382000mg/l0.0288000
3/1/200951.5010.0426300mg/l0.0515000
4/1/20094.0010.0329800mg/l0.0040000
6/1/20093.9910.0271800mg/l0.0039900
7/1/200927.2010.0231000mg/l0.0272000
8/1/200927.0010.0227400mg/l0.0270000
9/1/200910.2010.0144800mg/l0.0102000
10/1/200915.6010.0168000mg/l0.0156000
11/1/200918.2010.0170300mg/l0.0182000
12/1/20093.5410.0169600mg/l0.0035400
1/1/20108.3410.0138100mg/l0.0083400
2/1/20106.8710.0104600mg/l0.0068700
3/1/201010.7010.0105400mg/l0.0107000
4/1/20105.9010.0089300mg/l0.0059000
6/1/201027.7010.0119000mg/l0.0277000
7/1/20104.9810.0112300mg/l0.0049800
8/1/201011.3010.0121200mg/l0.0113000
9/1/201011.1320.0122000mg/l0.0110100
10/1/201012.2010.0134600mg/l0.0122000
11/1/20101.2710.0114300mg/l0.0012700
12/1/20103.1410.0073400mg/l0.0031400
1/1/20118.7610.0079700mg/l0.0087600
2/1/201129.1010.0109300mg/l0.0291000
3/1/20115.1310.0099300mg/l0.0051300
4/1/20114.7610.0086900mg/l0.0047600
5/1/201116.6010.0112500mg/l0.0166000
6/1/201123.0010.0145600mg/l0.0230000
7/1/201156.9010.0225800mg/l0.0569000
8/1/20114.9010.0185500mg/l0.0049000
9/1/201114.1010.0200400mg/l0.0141000
10/1/201122.0010.0229200mg/l0.0220000
11/1/201116.7010.0229300mg/l0.0167000
12/1/20114.7610.0198900mg/l0.0047600
1/1/20124.6910.0111900mg/l0.0046900
2/1/20124.4710.0111200mg/l0.0044700
3/1/201215.7010.0113900mg/l0.0157000
4/1/201219.8110.0110200mg/l0.0198100
5/1/201223.0010.0120700mg/l0.0230000
6/1/20128.4810.0126900mg/l0.0084800
7/1/20128.9410.0134000mg/l0.0089400
8/1/201212.4010.0147200mg/l0.0124000
9/1/20129.5710.0137000mg/l0.0095700
10/1/20123.3510.0109600mg/l0.0033500
11/1/20123.3710.0076900mg/l0.0033700
12/1/20121.7610.0065700mg/l0.0017600
1/1/20137.8910.0063900mg/l0.0078900
2/1/20133.7710.0049500mg/l0.0037700
3/1/201311.4010.0052600mg/l0.0114000
4/1/201310.1010.0063800mg/l0.0101000
5/1/20139.8510.0074600mg/l0.0098500
6/1/201321.8010.0108000mg/l0.0218000
7/1/201319.5010.0127400mg/l0.0195000
8/1/201320.0010.0154400mg/l0.0200000
9/1/20137.3210.0147600mg/l0.0073200
10/1/20138.8810.0145600mg/l0.0088800
12/1/20132.6110.0116600mg/l0.0026100
Target
mg/l
Threshold
0.011 mg/l
Pass

Nitrogen, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 1.8 2.3
Mean 1.4089 1.2462 0.33449087
Low 0.907 0.16
No. of Samples 11 152

Five-year Trend Graph

     
1/1/20091494.0011.4940000mg/l1.4940000
2/1/2009988.0011.2410000mg/l0.9880000
3/1/2009776.0011.0860000mg/l0.7760000
4/1/2009809.0011.0167500mg/l0.8090000
6/1/20091368.0011.0870000mg/l1.3680000
7/1/20091355.0011.0592000mg/l1.3550000
8/1/20091148.0011.0912000mg/l1.1480000
9/1/2009997.0011.1354000mg/l0.9970000
10/1/2009923.0011.1582000mg/l0.9230000
11/1/20091271.0011.1770000mg/l1.2710000
12/1/20091704.0011.2330000mg/l1.7040000
1/1/20101364.0011.2345000mg/l1.3640000
2/1/20101269.0011.2546700mg/l1.2690000
3/1/20101306.0011.3061700mg/l1.3060000
4/1/20101216.0011.3550000mg/l1.2160000
6/1/20101158.0011.2626000mg/l1.1580000
7/1/20101442.0011.2782000mg/l1.4420000
8/1/20101141.0011.2526000mg/l1.1410000
9/1/20101265.0021.2444000mg/l1.2647700
10/1/20101097.0011.2206000mg/l1.0970000
11/1/20101113.0011.2026700mg/l1.1130000
12/1/20101406.0011.2440000mg/l1.4060000
1/1/20111274.0011.2160000mg/l1.2740000
2/1/20111513.0011.2780000mg/l1.5130000
3/1/20111093.0011.2493300mg/l1.0930000
4/1/20111256.0011.2758300mg/l1.2560000
5/1/20111381.0011.3205000mg/l1.3810000
6/1/20111629.0011.3576700mg/l1.6290000
7/1/20111037.0011.3181700mg/l1.0370000
8/1/20111272.0011.2780000mg/l1.2720000
9/1/20111501.0011.3460000mg/l1.5010000
10/1/2011820.0011.2733300mg/l0.8200000
11/1/20111335.0011.2656700mg/l1.3350000
12/1/20111225.0011.1983300mg/l1.2250000
1/1/2012989.0011.1903300mg/l0.9890000
2/1/20121213.0011.1805000mg/l1.2130000
3/1/2012951.0011.0888300mg/l0.9510000
4/1/20121059.0011.1286700mg/l1.0590000
5/1/20121430.0011.1445000mg/l1.4300000
6/1/20121239.0011.1468300mg/l1.2390000
7/1/20121472.0011.2273300mg/l1.4720000
8/1/20121293.0011.2406700mg/l1.2930000
9/1/20121611.0011.3506700mg/l1.6110000
10/1/20121448.0011.4155000mg/l1.4480000
11/1/20121140.0011.3671700mg/l1.1400000
12/1/20121348.0011.3853300mg/l1.3480000
1/1/2013956.0011.2993300mg/l0.9560000
2/1/20131304.0011.3011700mg/l1.3040000
3/1/20131476.0011.2786700mg/l1.4760000
4/1/2013907.0011.1885000mg/l0.9070000
5/1/20131612.0011.2671700mg/l1.6120000
6/1/20131792.0011.3411700mg/l1.7920000
7/1/20131590.0011.4468300mg/l1.5900000
8/1/20131520.0011.4828300mg/l1.5200000
9/1/20131502.0011.4871700mg/l1.5020000
10/1/20131448.0011.5773300mg/l1.4480000
12/1/20131713.0011.5546000mg/l1.7130000
Pass

Phosphorus, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/l Year
2013
Historical
period of record
High 0.5 0.9
Mean 0.2761 0.2709 0.15953772
Low 0.147 0.08
No. of Samples 11 165

Five-year Trend Graph

     
1/1/2009159.0010.1590000mg/l0.1590000
2/1/2009108.0010.1335000mg/l0.1080000
3/1/2009386.0010.2176700mg/l0.3860000
4/1/2009333.0010.2465000mg/l0.3330000
6/1/2009429.0010.2830000mg/l0.4290000
7/1/2009361.0010.3234000mg/l0.3610000
8/1/2009225.0010.3468000mg/l0.2250000
9/1/2009154.0010.3004000mg/l0.1540000
10/1/2009315.0010.2968000mg/l0.3150000
11/1/2009134.0010.2696700mg/l0.1340000
12/1/2009161.0010.2250000mg/l0.1610000
1/1/2010121.0010.1850000mg/l0.1210000
2/1/2010167.0010.1753300mg/l0.1670000
3/1/2010183.0010.1801700mg/l0.1830000
4/1/2010271.0010.1728300mg/l0.2710000
6/1/2010894.0010.3272000mg/l0.8940000
7/1/2010301.0010.3632000mg/l0.3010000
8/1/2010125.0010.3548000mg/l0.1250000
9/1/2010344.0020.3870000mg/l0.3223900
10/1/2010472.0010.4272000mg/l0.4720000
11/1/2010453.0010.4315000mg/l0.4530000
12/1/2010307.0010.3336700mg/l0.3070000
1/1/2011231.0010.3220000mg/l0.2310000
2/1/2011251.0010.3430000mg/l0.2510000
3/1/2011325.0010.3398300mg/l0.3250000
4/1/2011367.0010.3223300mg/l0.3670000
5/1/2011603.0010.3473300mg/l0.6030000
6/1/2011361.0010.3563300mg/l0.3610000
7/1/2011448.0010.3925000mg/l0.4480000
8/1/2011184.0010.3813300mg/l0.1840000
9/1/2011312.0010.3791700mg/l0.3120000
10/1/2011611.0010.4198300mg/l0.6110000
11/1/2011175.0010.3485000mg/l0.1750000
12/1/2011410.0010.3566700mg/l0.4100000
1/1/2012289.0010.3301700mg/l0.2890000
2/1/2012281.0010.3463300mg/l0.2810000
3/1/2012467.0010.3721700mg/l0.4670000
4/1/2012307.0010.3215000mg/l0.3070000
5/1/2012489.0010.3738300mg/l0.4890000
6/1/2012147.0010.3300000mg/l0.1470000
7/1/2012280.0010.3285000mg/l0.2800000
8/1/2012185.0010.3125000mg/l0.1850000
9/1/2012224.0010.2720000mg/l0.2240000
10/1/2012257.0010.2636700mg/l0.2570000
11/1/2012299.0010.2320000mg/l0.2990000
12/1/2012282.0010.2545000mg/l0.2820000
1/1/2013247.0010.2490000mg/l0.2470000
2/1/2013278.0010.2645000mg/l0.2780000
3/1/2013187.0010.2583300mg/l0.1870000
4/1/2013377.0010.2783300mg/l0.3770000
5/1/2013495.0010.3110000mg/l0.4950000
6/1/2013346.0010.3216700mg/l0.3460000
7/1/2013256.0010.3231700mg/l0.2560000
8/1/2013147.0010.3013300mg/l0.1470000
9/1/2013236.0010.3095000mg/l0.2360000
10/1/2013249.0010.2881700mg/l0.2490000
12/1/2013387.0010.2550000mg/l0.3870000
Target
mg/l
Threshold
mg/l
Caution

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources
Score: Caution
Units: percent (%) Year
2013
Historical
period of record
High 44.0 157.4
Mean 18.17 41.67 22.2482
Low 6.90 1.50
No. of Samples 5 227

Five-year Trend Graph

     
1/1/200926.00126.0000000percent (%)26.0000000
2/1/200945.50135.7500000percent (%)45.5000000
3/1/200942.10137.8700000percent (%)42.1000000
4/1/200920.90133.6300000percent (%)20.9000000
6/1/200934.30133.7600000percent (%)34.3000000
7/1/200922.60133.0800000percent (%)22.6000000
8/1/200938.80131.7400000percent (%)38.8000000
9/1/200928.00128.9200000percent (%)28.0000000
10/1/200922.90129.3200000percent (%)22.9000000
11/1/200966.70135.5500000percent (%)66.7000000
1/1/201067.90144.8600000percent (%)67.9000000
2/1/201037.60144.6200000percent (%)37.6000000
3/1/201054.90150.0000000percent (%)54.9000000
4/1/201032.50151.9200000percent (%)32.5000000
9/1/201018.30125.4000000percent (%)18.3000000
11/1/201030.10124.2000000percent (%)30.1000000
1/1/201131.40126.6000000percent (%)31.4000000
2/1/201163.70135.8800000percent (%)63.7000000
3/1/201144.90142.5300000percent (%)44.9000000
4/1/201162.50146.5200000percent (%)62.5000000
5/1/201116.90143.8800000percent (%)16.9000000
1/1/201236.00136.0000000percent (%)36.0000000
2/1/201254.30145.1500000percent (%)54.3000000
3/1/201245.80145.3700000percent (%)45.8000000
4/1/201279.90154.0000000percent (%)79.9000000
5/1/201217.70146.7400000percent (%)17.7000000
7/1/201215.40142.6200000percent (%)15.4000000
8/1/201221.50136.0600000percent (%)21.5000000
9/1/201218.30130.5600000percent (%)18.3000000
10/1/20123.30115.2400000percent (%)3.3000000
11/1/201240.10119.7200000percent (%)40.1000000
1/1/201332.90123.2200000percent (%)32.9000000
2/1/20136.90120.3000000percent (%)6.9000000
3/1/201344.00125.4400000percent (%)44.0000000
4/1/201312.30127.2400000percent (%)12.3000000
5/1/201316.10122.4400000percent (%)16.1000000
Target
percent (%)
Threshold
56.00 percent (%)

Oysters

Units: Year
2013
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     

Rainfall

Units: inches Year
2013
Historical
period of record
High 40.2 45.7
Mean 10.8680411864682
Low 8.47
No. of Samples 360 4,798

Five-year Trend Graph

     
1/1/20090.78310.7800000inches0.7800000
2/1/20090.51280.5100000inches0.5100000
3/1/20090.97310.9700000inches0.9700000
4/1/20091.56301.5600000inches1.5600000
5/1/20095.03315.0300000inches5.0300000
6/1/20096.05306.0500000inches6.0500000
7/1/20093.94313.9400000inches3.9400000
8/1/20095.30315.3000000inches5.3000000
9/1/20095.46305.4600000inches5.4600000
10/1/20092.01312.0100000inches2.0100000
11/1/20094.28304.2800000inches4.2800000
12/1/20094.71314.7100000inches4.7100000
1/1/20103.48313.4800000inches3.4800000
2/1/20102.24282.2400000inches2.2400000
3/1/20107.87317.8700000inches7.8700000
4/1/20103.70303.7000000inches3.7000000
5/1/20101.26311.2600000inches1.2600000
6/1/20103.27303.2700000inches3.2700000
7/1/20105.13315.1300000inches5.1300000
8/1/20107.59317.5900000inches7.5900000
9/1/20102.90302.9000000inches2.9000000
10/1/20100.00310.0000000inches0.0000000
11/1/20100.65300.6500000inches0.6500000
12/1/20100.82310.8200000inches0.8200000
1/1/20112.37312.3700000inches2.3700000
2/1/20110.52280.5200000inches0.5200000
3/1/20118.87318.8700000inches8.8700000
4/1/20111.20301.2000000inches1.2000000
5/1/20112.29312.2900000inches2.2900000
6/1/20112.52302.5200000inches2.5200000
7/1/20116.45316.4500000inches6.4500000
8/1/20117.32317.3200000inches7.3200000
9/1/20114.92304.9200000inches4.9200000
10/1/20111.30311.3000000inches1.3000000
11/1/20111.95301.9500000inches1.9500000
12/1/20110.13300.1300000inches0.1300000
1/1/20120.57290.5700000inches0.5700000
2/1/20121.02291.0200000inches1.0200000
3/1/20121.44311.4400000inches1.4400000
4/1/20121.86241.8600000inches1.8600000
5/1/20122.55312.5500000inches2.5500000
6/1/201211.543011.5400000inches11.5400000
7/1/20126.86316.8600000inches6.8600000
8/1/20126.22316.2200000inches6.2200000
9/1/20124.71304.7100000inches4.7100000
10/1/20121.78311.7800000inches1.7800000
11/1/20120.13280.1300000inches0.1300000
12/1/20122.32312.3200000inches2.3200000
1/1/20130.42310.4200000inches0.4200000
2/1/20131.17231.1700000inches1.1700000
3/1/20131.41311.4100000inches1.4100000
4/1/20133.11303.1100000inches3.1100000
5/1/20132.19312.1900000inches2.1900000
6/1/20137.27307.2700000inches7.2700000
7/1/20137.39317.3900000inches7.3900000
8/1/20137.77317.7700000inches7.7700000
9/1/20136.52306.5200000inches6.5200000
10/1/20131.05311.0500000inches1.0500000
11/1/20131.56301.5600000inches1.5600000
12/1/20130.30310.3000000inches0.3000000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2013
Historical
period of record
High 22.6 28.0
Mean 13.74 8.51 7.81291
Low 3.58 0.00
No. of Samples 5 182

Five-year Trend Graph

     
1/1/20099.1019.1000000PSS9.1000000
2/1/20093.1116.1100000PSS3.1100000
3/1/200922.94111.7200000PSS22.9400000
4/1/20097.97110.7800000PSS7.9700000
6/1/20092.4319.1100000PSS2.4300000
7/1/200914.70110.2300000PSS14.7000000
8/1/200914.98112.6000000PSS14.9800000
9/1/20090.8218.1800000PSS0.8200000
10/1/200921.80110.9500000PSS21.8000000
11/1/20097.41110.3600000PSS7.4100000
1/1/20100.8519.1700000PSS0.8500000
2/1/20104.6417.1000000PSS4.6400000
3/1/20100.7217.0800000PSS0.7200000
4/1/20100.7112.8700000PSS0.7100000
9/1/201015.1517.9300000PSS15.1500000
11/1/201024.28119.7200000PSS24.2800000
1/1/201111.18116.8700000PSS11.1800000
2/1/20111.69113.0800000PSS1.6900000
3/1/20119.80111.7400000PSS9.8000000
4/1/20117.41110.8700000PSS7.4100000
5/1/201113.6318.7400000PSS13.6300000
1/1/201222.84122.8400000PSS22.8400000
2/1/201218.86120.8500000PSS18.8600000
3/1/201218.58120.0900000PSS18.5800000
4/1/201217.00119.3200000PSS17.0000000
5/1/201215.34118.5200000PSS15.3400000
7/1/20120.59114.0700000PSS0.5900000
8/1/20120.52110.4100000PSS0.5200000
9/1/20129.1418.5200000PSS9.1400000
10/1/20127.6216.6400000PSS7.6200000
11/1/201226.9918.9700000PSS26.9900000
1/1/201321.88113.2300000PSS21.8800000
2/1/201318.25116.7800000PSS18.2500000
3/1/20133.58115.6600000PSS3.5800000
4/1/201322.60118.6600000PSS22.6000000
5/1/201315.17116.3000000PSS15.1700000

Turbidity

Units: NTU Year
2013
Historical
period of record
High 8.0 22.2
Mean 4.85 4.81 2.99787
Low 2.70 1.20
No. of Samples 11 233

Five-year Trend Graph

     
1/1/20094.4014.4000000NTU4.4000000
2/1/20094.1014.2500000NTU4.1000000
3/1/20095.4014.6300000NTU5.4000000
4/1/20092.0013.9800000NTU2.0000000
6/1/20093.9013.9600000NTU3.9000000
7/1/20096.1014.3000000NTU6.1000000
8/1/20095.9014.6600000NTU5.9000000
9/1/20091.9413.9700000NTU1.9400000
10/1/20095.9014.7500000NTU5.9000000
11/1/20092.8014.4200000NTU2.8000000
12/1/20093.1014.2900000NTU3.1000000
1/1/20105.5014.1900000NTU5.5000000
2/1/20106.2014.2400000NTU6.2000000
3/1/20104.9014.7300000NTU4.9000000
4/1/20108.2015.1200000NTU8.2000000
6/1/201014.6017.8800000NTU14.6000000
7/1/20104.8017.7400000NTU4.8000000
8/1/20102.7017.0400000NTU2.7000000
9/1/20104.0026.8600000NTU3.8200000
10/1/201016.3018.4800000NTU16.3000000
11/1/20104.2017.7700000NTU4.2000000
12/1/20105.3016.2200000NTU5.3000000
1/1/20116.9016.5700000NTU6.9000000
2/1/20115.5017.0300000NTU5.5000000
3/1/20113.9017.0200000NTU3.9000000
4/1/20115.8015.2700000NTU5.8000000
5/1/20119.5016.1500000NTU9.5000000
6/1/20114.5016.0200000NTU4.5000000
7/1/20117.5016.1200000NTU7.5000000
8/1/20111.5815.4600000NTU1.5800000
9/1/20115.9015.8000000NTU5.9000000
10/1/20118.1016.1800000NTU8.1000000
11/1/20114.6015.3600000NTU4.6000000
12/1/20114.9015.4300000NTU4.9000000
1/1/20123.5014.7600000NTU3.5000000
2/1/20123.6015.1000000NTU3.6000000
3/1/20124.0014.7800000NTU4.0000000
4/1/20124.4014.1700000NTU4.4000000
5/1/20127.5014.6500000NTU7.5000000
6/1/20121.5014.0800000NTU1.5000000
7/1/20122.6013.9300000NTU2.6000000
8/1/20122.3013.7200000NTU2.3000000
9/1/20124.1013.7300000NTU4.1000000
10/1/20122.6013.4300000NTU2.6000000
11/1/20124.0012.8500000NTU4.0000000
12/1/20123.4013.1700000NTU3.4000000
1/1/20133.9013.3800000NTU3.9000000
2/1/20137.1014.1800000NTU7.1000000
3/1/20135.1014.3500000NTU5.1000000
4/1/20134.5014.6700000NTU4.5000000
5/1/20138.0015.3300000NTU8.0000000
6/1/20136.4015.8300000NTU6.4000000
7/1/20134.6015.9500000NTU4.6000000
8/1/20132.7015.2200000NTU2.7000000
9/1/20133.6014.9700000NTU3.6000000
10/1/20133.5014.8000000NTU3.5000000
12/1/20136.9014.2600000NTU6.9000000
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...

Impervious Features

North 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 North Creek Basin is covered by impervious surfaces.

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Land Use / Land Cover

North 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 »

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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.