Skip Navigation LinksHomeCreek ConditionsCreek Conditions Report

North Creek Condition Report for 2012

View 2014 Report 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
2012
Historical
period of record
High 0.032
Mean 0.0021 0.01169376
Low 0.0009
No. of Samples 0 9

Five-year Rolling Average Graph

      
Target
mg/l
Threshold
0.02 mg/l

Nitrogen, Total

Units: mg/l Year
2012
Historical
period of record
High 3.031
Mean 1.4041 0.59205696
Low 1.106
No. of Samples 0 9

Five-year Rolling Average Graph

      

Phosphorus, Total

Units: mg/l Year
2012
Historical
period of record
High 2.70
Mean 0.1632 0.71140806
Low 0.041
No. of Samples 0 13

Five-year Rolling Average 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
2012
Historical
period of record
High 54.10
Mean 26.28 13.93243
Low 10.70
No. of Samples 0 13

Five-year Rolling Average Graph

      
Target
percent (%)
Threshold
38.00 percent (%)

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Color

Units: PCU Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Escherichia coli

Units: cfu/100ml Year
2012
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
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

pH

Units: None Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Salinity

Units: PSS Year
2012
Historical
period of record
High 14.86
Mean 0.71 5.02317
Low 0.16
No. of Samples 0 13

Five-year Rolling Average Graph

      

Specific conductance

Units: umho Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Temperature, water

Units: deg F Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

      

Turbidity

Units: NTU Year
2012
Historical
period of record
High 25.10
Mean 3.67 7.11215
Low 1.40
No. of Samples 0 10

Five-year Rolling Average 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
2012
Historical
period of record
High 0.0 0.1
Mean 0.0074 0.0097 0.0113111
Low 0.0018 0.0009
No. of Samples 36 182

Five-year Rolling Average Graph

     
1/1/20087.3520.0073500mg/l0.0066900
2/1/200812.9840.0101700mg/l0.0111500
3/1/200825.6040.0153100mg/l0.0247400
4/1/200814.2030.0150300mg/l0.0140700
5/1/200828.1020.0176500mg/l0.0224500
6/1/200830.2020.0197400mg/l0.0300700
7/1/200811.6330.0204500mg/l0.0111400
8/1/20085.2010.0191600mg/l0.0052000
9/1/20088.8630.0163700mg/l0.0086100
10/1/20085.1520.0148600mg/l0.0051500
11/1/20089.5020.0117600mg/l0.0091400
12/1/20083.8410.0073600mg/l0.0038400
1/1/200947.6010.0133600mg/l0.0476000
2/1/200928.8010.0172900mg/l0.0288000
3/1/200951.5010.0244000mg/l0.0515000
4/1/20094.0010.0242100mg/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
1/1/20108.3430.0138100mg/l0.0083400
2/1/20106.8730.0104600mg/l0.0068700
3/1/201010.7030.0105400mg/l0.0107000
4/1/20105.9030.0089300mg/l0.0059000
6/1/201027.7030.0119000mg/l0.0277000
7/1/20104.9830.0112300mg/l0.0049800
8/1/201011.3030.0121200mg/l0.0113000
9/1/201011.1360.0122000mg/l0.0110100
10/1/201012.2030.0134600mg/l0.0122000
11/1/20101.2730.0114300mg/l0.0012700
12/1/20103.1430.0073400mg/l0.0031400
1/1/20118.7630.0079700mg/l0.0087600
2/1/201129.1030.0109300mg/l0.0291000
3/1/20115.1330.0099300mg/l0.0051300
4/1/20114.7630.0086900mg/l0.0047600
5/1/201116.6030.0112500mg/l0.0166000
6/1/201123.0030.0145600mg/l0.0230000
7/1/201156.9030.0225800mg/l0.0569000
8/1/20114.9030.0185500mg/l0.0049000
9/1/201114.1030.0200400mg/l0.0141000
10/1/201122.0030.0229200mg/l0.0220000
11/1/201116.7030.0229300mg/l0.0167000
12/1/20114.7630.0198900mg/l0.0047600
1/1/20124.6930.0111900mg/l0.0046900
2/1/20124.4730.0111200mg/l0.0044700
3/1/201215.7030.0113900mg/l0.0157000
4/1/201219.8030.0110200mg/l0.0198000
5/1/201223.0030.0120700mg/l0.0230000
6/1/20128.4830.0126900mg/l0.0084800
7/1/20128.9430.0134000mg/l0.0089400
8/1/201212.4030.0147200mg/l0.0124000
9/1/20129.5730.0137000mg/l0.0095700
10/1/20123.3530.0109600mg/l0.0033500
11/1/20123.3730.0076900mg/l0.0033700
12/1/20121.7630.0065700mg/l0.0017600
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
2012
Historical
period of record
High 1.6 2.3
Mean 1.2504 1.2344 0.33657694
Low 0.951 0.16
No. of Samples 12 141

Five-year Rolling Average Graph

     
1/1/20081269.5021.2695000mg/l1.1623300
2/1/20081420.5041.3450000mg/l1.3576100
3/1/20081378.7541.3562500mg/l1.2999800
4/1/20081628.3331.4242700mg/l1.6052300
5/1/20081334.5021.4063200mg/l1.2714000
6/1/20081620.0021.4419300mg/l1.5422000
7/1/20081743.6731.5209600mg/l1.7399400
8/1/20081410.0011.5192100mg/l1.4100000
9/1/20081432.6731.5282000mg/l1.4275800
10/1/20081353.5021.4823900mg/l1.3206200
11/1/20081251.0021.4684700mg/l1.2273700
12/1/20081149.0011.3899700mg/l1.1490000
1/1/20091494.0011.3483600mg/l1.4940000
2/1/2009988.0011.2780300mg/l0.9880000
3/1/2009776.0011.1685800mg/l0.7760000
4/1/2009809.0011.0778300mg/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
Pass

Phosphorus, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.5 0.9
Mean 0.2777 0.2781 0.16145442
Low 0.147 0.08
No. of Samples 36 226

Five-year Rolling Average Graph

     
1/1/2008187.5020.1875000mg/l0.1873500
2/1/2008240.5040.2140000mg/l0.2391800
3/1/2008238.7540.2222500mg/l0.2350800
4/1/2008294.6730.2403600mg/l0.2890200
5/1/2008541.5020.3005800mg/l0.5260300
6/1/2008804.0020.3844900mg/l0.7969800
7/1/2008274.6730.3990200mg/l0.2732800
8/1/2008200.0010.3922700mg/l0.2000000
9/1/2008235.6730.3917500mg/l0.2317600
10/1/2008255.5020.3852200mg/l0.2411200
11/1/2008254.0020.3373100mg/l0.2514400
12/1/2008145.0010.2274700mg/l0.1450000
1/1/2009159.0010.2082000mg/l0.1590000
2/1/2009108.0010.1928600mg/l0.1080000
3/1/2009386.0010.2179200mg/l0.3860000
4/1/2009333.0010.2308300mg/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
1/1/2010121.0030.1850000mg/l0.1210000
2/1/2010167.0030.1753300mg/l0.1670000
3/1/2010183.0030.1801700mg/l0.1830000
4/1/2010271.0030.1728300mg/l0.2710000
6/1/2010894.0030.3272000mg/l0.8940000
7/1/2010301.0030.3632000mg/l0.3010000
8/1/2010125.0030.3548000mg/l0.1250000
9/1/2010344.0060.3870000mg/l0.3223900
10/1/2010472.0030.4272000mg/l0.4720000
11/1/2010453.0030.4315000mg/l0.4530000
12/1/2010307.0030.3336700mg/l0.3070000
1/1/2011231.0030.3220000mg/l0.2310000
2/1/2011251.0030.3430000mg/l0.2510000
3/1/2011325.0030.3398300mg/l0.3250000
4/1/2011367.0030.3223300mg/l0.3670000
5/1/2011603.0030.3473300mg/l0.6030000
6/1/2011361.0030.3563300mg/l0.3610000
7/1/2011448.0030.3925000mg/l0.4480000
8/1/2011184.0030.3813300mg/l0.1840000
9/1/2011312.0030.3791700mg/l0.3120000
10/1/2011611.0030.4198300mg/l0.6110000
11/1/2011175.0030.3485000mg/l0.1750000
12/1/2011410.0030.3566700mg/l0.4100000
1/1/2012289.0030.3301700mg/l0.2890000
2/1/2012281.0030.3463300mg/l0.2810000
3/1/2012467.0030.3721700mg/l0.4670000
4/1/2012307.0030.3215000mg/l0.3070000
5/1/2012489.0030.3738300mg/l0.4890000
6/1/2012147.0030.3300000mg/l0.1470000
7/1/2012280.0030.3285000mg/l0.2800000
8/1/2012185.0030.3125000mg/l0.1850000
9/1/2012224.0030.2720000mg/l0.2240000
10/1/2012257.0030.2636700mg/l0.2570000
11/1/2012299.0030.2320000mg/l0.2990000
12/1/2012282.0030.2545000mg/l0.2820000
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
2012
Historical
period of record
High 79.9 157.4
Mean 25.16 39.61 21.7934
Low 3.30 1.50
No. of Samples 30 299

Five-year Rolling Average Graph

     
1/1/200888.45288.4500000percent (%)87.2500000
2/1/200825.08456.7700000percent (%)24.4100000
3/1/200836.05449.8600000percent (%)30.3800000
4/1/200826.70344.0700000percent (%)19.1100000
5/1/200858.55246.9700000percent (%)57.9800000
6/1/20089.55240.7300000percent (%)5.1400000
7/1/200825.10330.1700000percent (%)23.0200000
8/1/200823.10129.8400000percent (%)23.1000000
9/1/200837.30430.0500000percent (%)26.2000000
10/1/200849.50233.8500000percent (%)48.4000000
11/1/200841.50231.0100000percent (%)41.4600000
12/1/200824.30133.4700000percent (%)24.3000000
1/1/200926.00133.6200000percent (%)26.0000000
2/1/200945.50137.3500000percent (%)45.5000000
3/1/200942.10138.1500000percent (%)42.1000000
4/1/200920.90133.3800000percent (%)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
1/1/201067.90344.8600000percent (%)67.9000000
2/1/201037.60344.6200000percent (%)37.6000000
3/1/201054.90350.0000000percent (%)54.9000000
4/1/201032.50351.9200000percent (%)32.5000000
9/1/201018.26825.3800000percent (%)18.2600000
11/1/201030.06824.1600000percent (%)30.0600000
1/1/201131.40826.5700000percent (%)31.4000000
2/1/201163.69835.8500000percent (%)63.6900000
3/1/201144.84842.5000000percent (%)44.8400000
4/1/201162.51846.5000000percent (%)62.5100000
5/1/201116.85843.8600000percent (%)16.8500000
1/1/201236.00336.0000000percent (%)36.0000000
2/1/201254.30345.1500000percent (%)54.3000000
3/1/201245.80345.3700000percent (%)45.8000000
4/1/201279.90354.0000000percent (%)79.9000000
5/1/201217.70346.7400000percent (%)17.7000000
7/1/201215.40342.6200000percent (%)15.4000000
8/1/201221.50336.0600000percent (%)21.5000000
9/1/201218.30330.5600000percent (%)18.3000000
10/1/20123.30315.2400000percent (%)3.3000000
11/1/201240.10319.7200000percent (%)40.1000000
Target
percent (%)
Threshold
56.00 percent (%)

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/20082.6122.6100000mg/l2.3100000
2/1/20081.8342.2200000mg/l1.7700000
3/1/20082.7842.4100000mg/l2.7400000
4/1/20082.9532.5400000mg/l2.7700000
5/1/20083.2022.6700000mg/l2.9200000
6/1/20084.5522.9900000mg/l4.2700000
7/1/20081.6732.8300000mg/l1.6700000
8/1/20082.3012.9100000mg/l2.3000000
9/1/20082.7432.9000000mg/l2.5100000
10/1/20080.8922.5600000mg/l0.8700000
11/1/20081.2022.2300000mg/l0.9700000
12/1/20080.7111.5900000mg/l0.7100000
1/1/20092.6511.7500000mg/l2.6500000
2/1/20091.8411.6700000mg/l1.8400000
3/1/20095.6712.1600000mg/l5.6700000
4/1/20090.8712.1600000mg/l0.8700000
6/1/20091.1212.4300000mg/l1.1200000
7/1/20092.5212.4000000mg/l2.5200000
8/1/20092.5912.5500000mg/l2.5900000
9/1/20091.3211.6800000mg/l1.3200000
10/1/20092.8312.0800000mg/l2.8300000
11/1/20091.5711.9900000mg/l1.5700000
12/1/20091.1812.0000000mg/l1.1800000
1/1/20101.1531.7700000mg/l1.1500000
2/1/20101.3731.5700000mg/l1.3700000
3/1/20101.6031.6200000mg/l1.6000000
4/1/20101.3331.3700000mg/l1.3300000
6/1/20104.2031.9300000mg/l4.2000000
7/1/20101.3031.9600000mg/l1.3000000
8/1/20101.8932.0600000mg/l1.8900000
9/1/20101.4962.0400000mg/l1.4600000
10/1/20102.8132.3400000mg/l2.8100000
11/1/20101.3332.1700000mg/l1.3300000
12/1/20100.7131.5900000mg/l0.7100000
1/1/20111.8931.6900000mg/l1.8900000
2/1/20111.8231.6800000mg/l1.8200000
3/1/20111.4231.6600000mg/l1.4200000
4/1/20111.3931.4300000mg/l1.3900000
5/1/20112.9031.6900000mg/l2.9000000
6/1/20113.1232.0900000mg/l3.1200000
7/1/20114.3232.5000000mg/l4.3200000
8/1/20110.9832.3600000mg/l0.9800000
9/1/20111.9832.4500000mg/l1.9800000
10/1/20112.9732.7100000mg/l2.9700000
11/1/20111.4932.4800000mg/l1.4900000
12/1/20110.8032.0900000mg/l0.8000000
1/1/20121.7411.6600000mg/l1.7400000
2/1/20121.0731.6800000mg/l1.0700000
3/1/20121.4231.5800000mg/l1.4200000
4/1/20121.6231.3600000mg/l1.6200000
5/1/20122.6031.5400000mg/l2.6000000
6/1/20122.0031.7400000mg/l2.0000000
7/1/20121.3231.6700000mg/l1.3200000
8/1/20121.3931.7300000mg/l1.3900000
9/1/20120.9531.6500000mg/l0.9500000
10/1/20120.5431.4700000mg/l0.5400000
11/1/20121.0631.2100000mg/l1.0600000
12/1/20120.5030.9600000mg/l0.5000000

Color

Units: PCU Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

Enterococcus Group Bacteria

Units: cfu/100ml Year
2012
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
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/2008118.502118.5000000ug/l117.9400000
2/1/2008106.754112.6300000ug/l85.9700000
3/1/200852.75492.6700000ug/l46.5300000
4/1/2008148.673106.6700000ug/l147.4100000
5/1/200881.002101.5300000ug/l74.8300000
6/1/2008204.002118.6100000ug/l196.7200000
7/1/2008233.333137.7500000ug/l140.1000000
8/1/200876.001132.6300000ug/l76.0000000
9/1/200885.673138.1100000ug/l78.7900000
10/1/2008133.502135.5800000ug/l132.8200000
11/1/2008178.002151.7500000ug/l175.7800000
12/1/2008114.001136.7500000ug/l114.0000000
1/1/2009115.001117.0300000ug/l115.0000000
2/1/200990.001119.3600000ug/l90.0000000
3/1/2009224.001142.4200000ug/l224.0000000
4/1/2009105.001137.6700000ug/l105.0000000
6/1/2009217.001150.2000000ug/l217.0000000
7/1/2009200.001167.2000000ug/l200.0000000
8/1/2009267.001202.6000000ug/l267.0000000
9/1/200963.001170.4000000ug/l63.0000000
10/1/200972.001163.8000000ug/l72.0000000
11/1/200965.001147.3300000ug/l65.0000000
12/1/2009113.001130.0000000ug/l113.0000000
1/1/2010162.003123.6700000ug/l162.0000000
2/1/2010110.00397.5000000ug/l110.0000000
3/1/201081.003100.5000000ug/l81.0000000
4/1/2010126.003109.5000000ug/l126.0000000
6/1/2010315.003158.8000000ug/l315.0000000
7/1/2010113.003149.0000000ug/l113.0000000
8/1/201081.003143.2000000ug/l81.0000000
9/1/2010131.006153.2000000ug/l113.7400000
10/1/2010491.003226.2000000ug/l491.0000000
11/1/2010294.003237.5000000ug/l294.0000000
12/1/201069.003196.5000000ug/l69.0000000
1/1/201150.003186.0000000ug/l50.0000000
2/1/2011190.003204.1700000ug/l190.0000000
3/1/201170.003194.0000000ug/l70.0000000
4/1/2011166.003139.8300000ug/l166.0000000
5/1/2011210.003125.8300000ug/l210.0000000
6/1/2011135.003136.8300000ug/l135.0000000
7/1/201132.003133.8300000ug/l32.0000000
8/1/201127.003106.6700000ug/l27.0000000
9/1/2011157.003121.1700000ug/l157.0000000
10/1/2011362.003153.8300000ug/l362.0000000
11/1/201197.003135.0000000ug/l97.0000000
12/1/2011243.003153.0000000ug/l243.0000000
1/1/2012134.003170.0000000ug/l134.0000000
2/1/2012116.003184.8300000ug/l116.0000000
3/1/201260.003168.6700000ug/l60.0000000
4/1/201288.673123.1100000ug/l88.6700000
5/1/201249.003115.1100000ug/l49.0000000
6/1/2012102.00391.6100000ug/l102.0000000
7/1/201292.00384.6100000ug/l92.0000000
8/1/201251.00373.7800000ug/l51.0000000
9/1/2012134.00386.1100000ug/l134.0000000
10/1/201297.00387.5000000ug/l97.0000000
11/1/2012151.003104.5000000ug/l151.0000000
12/1/2012143.003111.3300000ug/l143.0000000

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/20081059.0021059.0000000ug/l1002.6000000
2/1/20081278.7541168.8800000ug/l1225.0500000
3/1/20081317.0041218.2500000ug/l1243.9000000
4/1/20081526.6731295.3600000ug/l1504.4000000
5/1/20081306.0021297.4800000ug/l1245.1500000
6/1/20081610.0021349.5700000ug/l1533.6200000
7/1/20081653.3331448.6300000ug/l1650.0800000
8/1/20081300.0011452.1700000ug/l1300.0000000
9/1/20081340.0031456.0000000ug/l1334.9500000
10/1/20081202.0021401.8900000ug/l1164.4700000
11/1/20081051.5021359.4700000ug/l992.0700000
12/1/20081010.0011259.4700000ug/l1010.0000000
1/1/20091400.0011217.2500000ug/l1400.0000000
2/1/2009971.0011162.4200000ug/l971.0000000
3/1/2009765.0011066.5800000ug/l765.0000000
4/1/2009754.001991.9200000ug/l754.0000000
6/1/20091280.0011034.0000000ug/l1280.0000000
7/1/20091350.0011024.0000000ug/l1350.0000000
8/1/20091110.0011051.8000000ug/l1110.0000000
9/1/2009961.0011091.0000000ug/l961.0000000
10/1/2009811.0011102.4000000ug/l811.0000000
11/1/20091090.0011100.3300000ug/l1090.0000000
12/1/20091300.0011103.6700000ug/l1300.0000000
1/1/20101050.0031053.6700000ug/l1050.0000000
2/1/20101020.0031038.6700000ug/l1020.0000000
3/1/20101210.0031080.1700000ug/l1210.0000000
4/1/20101110.0031130.0000000ug/l1110.0000000
6/1/20101150.0031108.0000000ug/l1150.0000000
7/1/20101270.0031152.0000000ug/l1270.0000000
8/1/20101100.0031168.0000000ug/l1100.0000000
9/1/20101140.0061154.0000000ug/l1140.0000000
10/1/20101020.0031136.0000000ug/l1020.0000000
11/1/2010973.0031108.8300000ug/l973.0000000
12/1/2010956.0031076.5000000ug/l956.0000000
1/1/2011961.0031025.0000000ug/l961.0000000
2/1/20111300.0031058.3300000ug/l1300.0000000
3/1/20111030.0031040.0000000ug/l1030.0000000
4/1/20111060.0031046.6700000ug/l1060.0000000
5/1/20111210.0031086.1700000ug/l1210.0000000
6/1/20111520.0031180.1700000ug/l1520.0000000
7/1/20111010.0031188.3300000ug/l1010.0000000
8/1/20111190.0031170.0000000ug/l1190.0000000
9/1/20111300.0031215.0000000ug/l1300.0000000
10/1/2011803.0031172.1700000ug/l803.0000000
11/1/20111120.0031157.1700000ug/l1120.0000000
12/1/2011924.0031057.8300000ug/l924.0000000
1/1/2012803.0031023.3300000ug/l803.0000000
2/1/2012995.003990.8300000ug/l995.0000000
3/1/2012921.003927.6700000ug/l921.0000000
4/1/2012987.003958.3300000ug/l987.0000000
5/1/20121410.0031006.6700000ug/l1410.0000000
6/1/20121200.0031052.6700000ug/l1200.0000000
7/1/20121250.0031127.1700000ug/l1250.0000000
8/1/20121140.0031151.3300000ug/l1140.0000000
9/1/20121300.0031214.5000000ug/l1300.0000000
10/1/20121140.0031240.0000000ug/l1140.0000000
11/1/2012879.0031151.5000000ug/l879.0000000
12/1/20121040.0031124.8300000ug/l1040.0000000

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/2008210.502210.5000000ug/l124.8200000
2/1/2008141.754176.1300000ug/l129.0500000
3/1/200861.754138.0000000ug/l54.9500000
4/1/2008101.673128.9200000ug/l97.5900000
5/1/200828.502108.8300000ug/l26.0800000
6/1/200810.00292.3600000ug/l8.0000000
7/1/200890.33372.3300000ug/l81.8000000
8/1/2008110.00167.0400000ug/l110.0000000
9/1/200892.67372.2000000ug/l92.5600000
10/1/2008151.50280.5000000ug/l151.4900000
11/1/2008199.502109.0000000ug/l168.6900000
12/1/2008139.001130.5000000ug/l139.0000000
1/1/200994.001131.1100000ug/l94.0000000
2/1/200917.001115.6100000ug/l17.0000000
3/1/200911.001102.0000000ug/l11.0000000
4/1/200955.00185.9200000ug/l55.0000000
6/1/200988.00153.0000000ug/l88.0000000
7/1/20095.00135.2000000ug/l5.0000000
8/1/200938.00139.4000000ug/l38.0000000
9/1/200936.00144.4000000ug/l36.0000000
10/1/2009112.00155.8000000ug/l112.0000000
11/1/2009181.00176.6700000ug/l181.0000000
12/1/2009404.001129.3300000ug/l404.0000000
1/1/2010314.003180.8300000ug/l314.0000000
2/1/2010249.003216.0000000ug/l249.0000000
3/1/201096.003226.0000000ug/l96.0000000
4/1/2010106.003225.0000000ug/l106.0000000
6/1/20108.003154.6000000ug/l8.0000000
7/1/2010172.003126.2000000ug/l172.0000000
8/1/201041.00384.6000000ug/l41.0000000
9/1/2010125.00690.4000000ug/l122.6700000
10/1/201077.00384.6000000ug/l77.0000000
11/1/2010140.00393.8300000ug/l140.0000000
12/1/2010450.003167.5000000ug/l450.0000000
1/1/2011313.003191.0000000ug/l313.0000000
2/1/2011213.003219.6700000ug/l213.0000000
3/1/201163.003209.3300000ug/l63.0000000
4/1/2011196.003229.1700000ug/l196.0000000
5/1/2011171.003234.3300000ug/l171.0000000
6/1/2011109.003177.5000000ug/l109.0000000
7/1/201127.003129.8300000ug/l27.0000000
8/1/201182.003108.0000000ug/l82.0000000
9/1/2011201.003131.0000000ug/l201.0000000
10/1/201117.003101.1700000ug/l17.0000000
11/1/2011215.003108.5000000ug/l215.0000000
12/1/2011301.003140.5000000ug/l301.0000000
1/1/2012186.003167.0000000ug/l186.0000000
2/1/2012218.003189.6700000ug/l218.0000000
3/1/201230.003161.1700000ug/l30.0000000
4/1/201272.003170.3300000ug/l72.0000000
5/1/201220.003137.8300000ug/l20.0000000
6/1/201239.00394.1700000ug/l39.0000000
7/1/2012222.003100.1700000ug/l222.0000000
8/1/2012153.00389.3300000ug/l153.0000000
9/1/2012311.003136.1700000ug/l311.0000000
10/1/2012308.003175.5000000ug/l308.0000000
11/1/2012261.003215.6700000ug/l261.0000000
12/1/2012308.003260.5000000ug/l308.0000000

Oysters

Units: Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     

pH

Units: None Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/20087.4927.4900000None7.4900000
2/1/20087.3447.4200000None7.3400000
3/1/20087.4147.4100000None7.4100000
4/1/20087.3237.3900000None7.3200000
5/1/20087.3427.3800000None7.3300000
6/1/20087.4327.3900000None7.4200000
7/1/20087.1937.3400000None7.1900000
8/1/20087.1817.3100000None7.1800000
9/1/20087.2447.2800000None7.2400000
10/1/20087.3527.2900000None7.3400000
11/1/20087.2327.2700000None7.2200000
12/1/20087.2617.2400000None7.2600000
1/1/20096.9117.2000000None6.9100000
2/1/20097.0717.1800000None7.0700000
3/1/20097.1617.1600000None7.1600000
4/1/20097.2417.1500000None7.2400000
6/1/20097.1217.1000000None7.1200000
7/1/20097.2917.1800000None7.2900000
8/1/20097.0017.1600000None7.0000000
9/1/20097.3417.2000000None7.3400000
10/1/20097.2917.2100000None7.2900000
11/1/20097.1517.2000000None7.1500000
1/1/20107.4637.2500000None7.4600000
2/1/20107.2637.3000000None7.2600000
3/1/20107.2137.2700000None7.2100000
4/1/20107.5037.3200000None7.5000000
9/1/20107.1137.3100000None7.1100000
11/1/20107.4537.2800000None7.4500000
1/1/20117.3937.3200000None7.3900000
2/1/20117.6337.4000000None7.6300000
3/1/20117.3237.4500000None7.3200000
4/1/20117.4137.4400000None7.4100000
5/1/20117.4237.4300000None7.4200000
1/1/20127.1337.1300000None7.1300000
2/1/20127.2837.2100000None7.2800000
3/1/20127.2937.2300000None7.2900000
4/1/20127.0837.2000000None7.0800000
5/1/20126.9737.1500000None6.9700000
7/1/20126.9637.1200000None6.9600000
8/1/20127.0837.0800000None7.0800000
9/1/20127.2637.0700000None7.2600000
10/1/20127.0737.0700000None7.0700000
11/1/20127.3437.1400000None7.3400000

Salinity

Units: PSS Year
2012
Historical
period of record
High 27.0 28.0
Mean 8.09 7.84 7.91764
Low 0.52 0.00
No. of Samples 30 219

Five-year Rolling Average Graph

     
1/1/20088.4328.4300000PSS7.9900000
2/1/200810.5349.4800000PSS8.6300000
3/1/200811.06410.0100000PSS10.4400000
4/1/200812.09310.5300000PSS8.2100000
5/1/200817.20211.8600000PSS16.9000000
6/1/200823.90213.8700000PSS23.9000000
7/1/20088.74313.9200000PSS8.4400000
8/1/20080.78112.3000000PSS0.7800000
9/1/20083.79411.0800000PSS2.3800000
10/1/20089.13210.5900000PSS5.5900000
11/1/200814.05210.0700000PSS13.8800000
12/1/200811.4918.0000000PSS11.4900000
1/1/20099.1018.0600000PSS9.1000000
2/1/20093.1118.4500000PSS3.1100000
3/1/200922.94111.6400000PSS22.9400000
4/1/20097.97111.4400000PSS7.9700000
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
1/1/20100.8539.1700000PSS0.8500000
2/1/20104.6437.1000000PSS4.6400000
3/1/20100.7237.0800000PSS0.7200000
4/1/20100.7132.8700000PSS0.7100000
9/1/201015.1537.9300000PSS15.1500000
11/1/201024.28319.7200000PSS24.2800000
1/1/201111.18316.8700000PSS11.1800000
2/1/20111.69313.0800000PSS1.6900000
3/1/20119.80311.7400000PSS9.8000000
4/1/20117.41310.8700000PSS7.4100000
5/1/201113.6338.7400000PSS13.6300000
1/1/201222.84322.8400000PSS22.8400000
2/1/201218.86320.8500000PSS18.8600000
3/1/201218.58320.0900000PSS18.5800000
4/1/201217.00319.3200000PSS17.0000000
5/1/201215.34318.5200000PSS15.3400000
7/1/20120.59314.0700000PSS0.5900000
8/1/20120.52310.4100000PSS0.5200000
9/1/20129.1438.5200000PSS9.1400000
10/1/20127.6236.6400000PSS7.6200000
11/1/201226.9938.9700000PSS26.9900000

Specific conductance

Units: umho Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/200814426.00214426.0000000umho13784.5200000
2/1/200817572.75415999.3800000umho14802.0700000
3/1/200818566.25416855.0000000umho17682.8900000
4/1/200820113.67317669.6700000umho15012.9000000
5/1/200828040.00219743.7300000umho27635.0900000
6/1/200837994.00222785.4500000umho37993.8700000
7/1/200815122.00322901.4500000umho14677.0700000
8/1/20081568.00120233.9900000umho1568.0000000
9/1/20086720.00418259.6100000umho4438.6700000
10/1/200815165.50217434.9200000umho9822.7200000
11/1/200823178.50216624.6700000umho22933.7400000
12/1/200819293.00113507.8300000umho19293.0000000
1/1/200915557.00113580.3300000umho15557.0000000
2/1/20095713.00114271.1700000umho5713.0000000
3/1/200936348.00119209.1700000umho36348.0000000
4/1/200913810.00118983.2500000umho13810.0000000
6/1/20094582.00115202.0000000umho4582.0000000
7/1/200924403.00116971.2000000umho24403.0000000
8/1/200924799.00120788.4000000umho24799.0000000
9/1/20091635.00113845.8000000umho1635.0000000
10/1/200934745.00118032.8000000umho34745.0000000
11/1/200912844.00117168.0000000umho12844.0000000
1/1/20101678.00315140.2000000umho1678.0000000
2/1/20108317.00311843.8000000umho8317.0000000
3/1/20101421.00311801.0000000umho1421.0000000
4/1/20101425.0035137.0000000umho1425.0000000
9/1/201025.063725.0300000umho25.0600000
11/1/201038241.00319133.0300000umho38241.0000000
1/1/201118793.00319019.6900000umho18793.0000000
2/1/20113218.00315069.2700000umho3218.0000000
3/1/201116747.00319249.7500000umho16747.0000000
4/1/201112995.00317998.8000000umho12995.0000000
5/1/201122797.00314910.0000000umho22797.0000000
1/1/201236134.00336134.0000000umho36134.0000000
2/1/201230408.00333271.0000000umho30408.0000000
3/1/201230096.00332212.6700000umho30096.0000000
4/1/201227667.00331076.2500000umho27667.0000000
5/1/201225346.00329930.2000000umho25346.0000000
7/1/20121193.00322942.0000000umho1193.0000000
8/1/20121065.00317073.4000000umho1065.0000000
9/1/201215745.00314203.2000000umho15745.0000000
10/1/201213281.00311326.0000000umho13281.0000000
11/1/201241974.00314651.6000000umho41974.0000000

Temperature, water

Units: deg F Year
2012
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Rolling Average Graph

     
1/1/200870.64270.6400000deg F70.6200000
2/1/200876.82473.7300000deg F76.8100000
3/1/200876.91474.7900000deg F76.8900000
4/1/200879.61376.0000000deg F79.3600000
5/1/200885.84277.9600000deg F85.8400000
6/1/200891.20280.1700000deg F91.1900000
7/1/200886.88382.8800000deg F86.7800000
8/1/200883.88184.0500000deg F83.8800000
9/1/200882.93485.0600000deg F82.9200000
10/1/200870.23283.4900000deg F69.8000000
11/1/200870.87281.0000000deg F70.8200000
12/1/200871.31177.6800000deg F71.3100000
1/1/200969.30174.7500000deg F69.3000000
2/1/200966.45171.8500000deg F66.4500000
3/1/200977.94171.0200000deg F77.9400000
4/1/200977.56172.2400000deg F77.5600000
6/1/200981.16174.4800000deg F81.1600000
7/1/200988.23178.2700000deg F88.2300000
8/1/200986.72182.3200000deg F86.7200000
9/1/200983.44183.4200000deg F83.4400000
10/1/200980.42183.9900000deg F80.4200000
11/1/200965.88180.9800000deg F65.8800000
1/1/201048.56273.0000000deg F48.5600000
2/1/201065.66268.7900000deg F65.6600000
3/1/201064.60265.0200000deg F64.6000000
4/1/201072.25263.3900000deg F72.2500000
9/1/201086.67279.4600000deg F86.6700000
11/1/201077.09281.8800000deg F77.0900000
1/1/201167.75277.1700000deg F67.7500000
2/1/201169.66275.2900000deg F69.6600000
3/1/201181.18273.9200000deg F81.1800000
4/1/201187.35276.6100000deg F87.3500000
5/1/201189.69279.1300000deg F89.6900000
1/1/201273.45273.4500000deg F73.4500000
2/1/201275.65274.5500000deg F75.6500000
3/1/201282.85277.3200000deg F82.8500000
4/1/201275.83276.9500000deg F75.8300000
5/1/201286.52278.8600000deg F86.5200000
7/1/201281.66280.5000000deg F81.6600000
8/1/201282.17281.8100000deg F82.1700000
9/1/201284.67282.1700000deg F84.6700000
10/1/201280.65283.1300000deg F80.6500000
11/1/201269.53279.7400000deg F69.5300000

Turbidity

Units: NTU Year
2012
Historical
period of record
High 7.5 22.2
Mean 3.37 4.78 3.05512
Low 1.50 1.20
No. of Samples 36 294

Five-year Rolling Average Graph

     
1/1/20087.0527.0500000NTU7.0200000
2/1/20086.5546.8000000NTU6.4200000
3/1/20088.1847.2600000NTU7.6200000
4/1/20089.0737.7100000NTU8.9300000
5/1/20089.0527.9800000NTU8.5600000
6/1/20089.7528.2800000NTU9.1900000
7/1/20084.6337.8700000NTU4.5900000
8/1/20083.0017.2800000NTU3.0000000
9/1/20084.0336.5900000NTU3.9100000
10/1/20084.3025.7900000NTU4.2600000
11/1/20083.9024.9400000NTU3.8900000
12/1/20083.1013.8300000NTU3.1000000
1/1/20094.4013.7900000NTU4.4000000
2/1/20094.1013.9700000NTU4.1000000
3/1/20095.4014.2000000NTU5.4000000
4/1/20092.0013.8200000NTU2.0000000
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
1/1/20105.5034.1900000NTU5.5000000
2/1/20106.2034.2400000NTU6.2000000
3/1/20104.9034.7300000NTU4.9000000
4/1/20108.2035.1200000NTU8.2000000
6/1/201014.6037.8800000NTU14.6000000
7/1/20104.8037.7400000NTU4.8000000
8/1/20102.7037.0400000NTU2.7000000
9/1/20104.0066.8600000NTU3.8200000
10/1/201016.3038.4800000NTU16.3000000
11/1/20104.2037.7700000NTU4.2000000
12/1/20105.3036.2200000NTU5.3000000
1/1/20116.9036.5700000NTU6.9000000
2/1/20115.5037.0300000NTU5.5000000
3/1/20113.9037.0200000NTU3.9000000
4/1/20115.8035.2700000NTU5.8000000
5/1/20119.5036.1500000NTU9.5000000
6/1/20114.5036.0200000NTU4.5000000
7/1/20117.5036.1200000NTU7.5000000
8/1/20111.5835.4600000NTU1.5800000
9/1/20115.9035.8000000NTU5.9000000
10/1/20118.1036.1800000NTU8.1000000
11/1/20114.6035.3600000NTU4.6000000
12/1/20114.9035.4300000NTU4.9000000
1/1/20123.5034.7600000NTU3.5000000
2/1/20123.6035.1000000NTU3.6000000
3/1/20124.0034.7800000NTU4.0000000
4/1/20124.4034.1700000NTU4.4000000
5/1/20127.5034.6500000NTU7.5000000
6/1/20121.5034.0800000NTU1.5000000
7/1/20122.6033.9300000NTU2.6000000
8/1/20122.3033.7200000NTU2.3000000
9/1/20124.1033.7300000NTU4.1000000
10/1/20122.6033.4300000NTU2.6000000
11/1/20124.0032.8500000NTU4.0000000
12/1/20123.4033.1700000NTU3.4000000
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...

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.

Loading interactive chart...

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 »

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.