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Whitaker Bayou 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: 4,967 acres
  • Location: North Sarasota County, south Manatee County
  • Discharges into: Sarasota Bay

Whitaker Bayou is a highly urbanized basin that has changed in land use and hydrology since the mid-1900s. The Sarasota County 1847 General Land Office Survey indicates that Whitaker Bayou only extended about a quarter of a mile inland from the bay. The survey also displays a separate waterway that extends inland from 0.25 mile northeast of the head of Whitaker Bayou. Seasonal patterns in freshwater inflows have not changed significantly between historic and current conditions, indicating that changes in land use have not altered the intra-annual pattern of inflows to the bay. Land use has, however, affected the magnitude of total inflow to the bay, if not the relative contributions of individual sources (runoff, baseflow, irrigation, point sources). For full basin details see: 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:
  • 1936A
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 0.0595 0.0595
Mean 0.0025 0.0018 0.00548506
Low 0.0005 0.00
No. of Samples 36 201

Five-year Trend Graph

      
1/1/20070.8330.0008300mg/l0.0006400
2/1/20072.1630.0015000mg/l0.0017800
3/1/20070.9630.0013200mg/l0.0008500
4/1/20071.3230.0013200mg/l0.0010900
5/1/200711.0430.0032600mg/l0.0044200
6/1/20074.4230.0034600mg/l0.0029000
7/1/20072.5430.0037400mg/l0.0024400
8/1/20072.6330.0038200mg/l0.0022900
9/1/20071.0730.0038400mg/l0.0010500
10/1/20074.6930.0044000mg/l0.0045400
11/1/20072.4030.0029600mg/l0.0018800
12/1/20071.1230.0024100mg/l0.0010300
1/1/20081.8830.0023000mg/l0.0017100
2/1/20080.9430.0020200mg/l0.0009200
3/1/20081.2320.0020400mg/l0.0012200
4/1/20081.8330.0015700mg/l0.0018000
5/1/20081.8930.0014800mg/l0.0016900
6/1/20081.4730.0015400mg/l0.0013700
7/1/20082.4220.0016300mg/l0.0020700
8/1/20081.7430.0017600mg/l0.0014700
9/1/20082.8330.0020300mg/l0.0025100
10/1/20081.2330.0019300mg/l0.0010800
11/1/20080.7230.0017400mg/l0.0006800
12/1/20082.4630.0019000mg/l0.0018500
1/1/200911.4930.0034100mg/l0.0061900
2/1/20091.3230.0033400mg/l0.0013100
3/1/20092.0730.0032200mg/l0.0017300
4/1/20098.5630.0044400mg/l0.0056500
5/1/20094.7750.0051100mg/l0.0038900
6/1/20092.5630.0051300mg/l0.0021800
7/1/20091.8230.0035200mg/l0.0017000
8/1/20091.4430.0035400mg/l0.0014200
9/1/20091.9830.0035200mg/l0.0017900
10/1/20091.8230.0024000mg/l0.0016100
11/1/20096.5550.0027000mg/l0.0026300
12/1/20091.4830.0025200mg/l0.0014000
1/1/20101.5330.0024700mg/l0.0014500
2/1/20105.3830.0031200mg/l0.0030400
3/1/20104.5630.0035500mg/l0.0031900
4/1/20101.7730.0035500mg/l0.0017400
6/1/20104.2930.0035100mg/l0.0030100
7/1/20101.9430.0035900mg/l0.0019000
9/1/20102.2960.0025700mg/l0.0017400
10/1/20103.2030.0029300mg/l0.0020700
11/1/20101.9330.0027300mg/l0.0013800
12/1/20100.7630.0020200mg/l0.0006600
1/1/20115.4430.0027200mg/l0.0053800
2/1/20111.2430.0024800mg/l0.0010500
3/1/20110.8830.0022400mg/l0.0007800
4/1/20111.8430.0020200mg/l0.0017200
5/1/20115.8130.0026600mg/l0.0044700
6/1/20116.2230.0035700mg/l0.0057100
7/1/20113.2330.0032000mg/l0.0026300
8/1/20118.9530.0044900mg/l0.0069800
9/1/20111.3030.0045600mg/l0.0012600
10/1/20111.9730.0045800mg/l0.0019600
11/1/20111.1430.0038000mg/l0.0010700
12/1/201121.3130.0063200mg/l0.0053100
Target
mg/l
Threshold
0.02 mg/l
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 2.10 15.76
Mean 0.8893 0.8965 1.80458032
Low 0.494 0.30
No. of Samples 36 248

Five-year Trend Graph

      
1/1/2007911.6730.9116700mg/l0.9111600
2/1/2007513.5030.7125900mg/l0.5068800
3/1/2007779.6730.7349500mg/l0.7688800
4/1/2007563.1730.6920000mg/l0.5425900
5/1/2007924.6730.7385400mg/l0.8990100
6/1/2007847.6730.7567300mg/l0.8240000
7/1/20071226.0030.8091100mg/l1.2215700
8/1/20071065.6730.9011400mg/l1.0577000
9/1/2007636.3330.8772500mg/l0.6358900
10/1/2007906.3330.9344500mg/l0.9058500
11/1/2007546.3330.8713900mg/l0.5448800
12/1/2007405.6730.7977200mg/l0.3972900
1/1/2008449.8330.6683600mg/l0.4365000
2/1/2008405.6730.5583600mg/l0.4017800
3/1/2008449.0020.5271400mg/l0.4459800
4/1/2008861.3330.5196400mg/l0.8513200
5/1/2008814.6730.5643600mg/l0.7916900
6/1/20081067.5030.6746700mg/l0.9652900
7/1/2008636.5020.7057800mg/l0.6361000
8/1/2008722.0030.7585000mg/l0.7192200
9/1/20081051.3330.8588900mg/l0.9760300
10/1/2008599.0030.8151700mg/l0.5822700
11/1/2008517.6730.7656700mg/l0.5108600
12/1/2008780.0030.7177500mg/l0.7688600
1/1/2009655.0030.7208300mg/l0.6495000
2/1/2009735.0030.7230000mg/l0.7314400
3/1/2009790.3330.6795000mg/l0.7827200
4/1/2009950.6730.7381100mg/l0.9149500
5/1/2009822.7540.7889600mg/l0.7873000
6/1/2009765.6730.7865700mg/l0.7609400
7/1/2009716.3330.7967900mg/l0.7099200
8/1/2009646.0030.7819600mg/l0.6455100
9/1/20091076.0030.8295700mg/l1.0736500
10/1/2009872.6730.8165700mg/l0.8398200
11/1/2009845.0040.8202800mg/l0.8010700
12/1/20091134.0030.8816700mg/l1.0824900
1/1/20101272.6730.9743900mg/l1.2415500
2/1/2010820.6731.0035000mg/l0.8199000
3/1/20101110.3331.0092200mg/l1.1015300
4/1/2010924.0031.0177800mg/l0.8682900
6/1/20101998.0031.2251300mg/l1.9020400
7/1/2010934.6731.1575300mg/l0.9332000
9/1/20101291.8361.2871300mg/l1.2231800
10/1/2010864.6731.2722900mg/l0.8537900
11/1/2010740.3331.1659000mg/l0.7230800
12/1/2010719.0030.9101000mg/l0.6983300
1/1/20111050.3330.9332300mg/l1.0330600
2/1/2011763.0030.9048600mg/l0.7563100
3/1/2011833.3330.8284400mg/l0.8266100
4/1/2011788.6730.8157800mg/l0.7825800
5/1/2011950.0030.8507200mg/l0.9391700
6/1/20111114.6730.9166700mg/l1.0953100
7/1/20111210.0030.9432800mg/l1.0703100
8/1/20111346.0031.0404500mg/l1.3073100
9/1/2011884.0031.0488900mg/l0.8587800
10/1/2011676.0031.0301100mg/l0.6570200
11/1/2011766.3330.9995000mg/l0.7152300
12/1/2011858.3330.9567800mg/l0.8334400
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2011
Historical
period of record
High 0.836 2.38
Mean 0.3399 0.3086 0.22295988
Low 0.111 0.111
No. of Samples 36 241

Five-year Trend Graph

      
1/1/2007228.0030.2280000mg/l0.2022000
2/1/2007122.6730.1753400mg/l0.1182400
3/1/2007218.3330.1896700mg/l0.2143500
4/1/2007250.6730.2049200mg/l0.2443700
5/1/2007416.0030.2471300mg/l0.4148300
6/1/2007565.0030.3001100mg/l0.5506000
7/1/2007468.6730.3402200mg/l0.4596100
8/1/2007325.0030.3739500mg/l0.3191900
9/1/2007276.0030.3835600mg/l0.2743900
10/1/2007337.6730.3980600mg/l0.3366400
11/1/2007311.0030.3805600mg/l0.2738900
12/1/2007168.3330.3144500mg/l0.1639900
1/1/2008161.0030.2631700mg/l0.1602100
2/1/2008231.0030.2475000mg/l0.2238600
3/1/2008210.5020.2365800mg/l0.2003700
4/1/2008268.0030.2249700mg/l0.2588800
5/1/2008365.0030.2339700mg/l0.3637800
6/1/2008430.3330.2776400mg/l0.4208600
7/1/2008325.0020.3049700mg/l0.3242500
8/1/2008282.6730.3135800mg/l0.2722300
9/1/2008353.6730.3374500mg/l0.3431200
10/1/2008187.6730.3240600mg/l0.1759600
11/1/2008157.6730.2895000mg/l0.1473900
12/1/2008228.3330.2558400mg/l0.2169500
1/1/2009246.6730.2427800mg/l0.2339000
2/1/2009239.3330.2355600mg/l0.2228000
3/1/2009567.3330.2711700mg/l0.5604600
4/1/2009438.6730.3130000mg/l0.4338900
5/1/2009414.5040.3558100mg/l0.4083300
6/1/2009423.6730.3883600mg/l0.4199000
7/1/2009346.0030.4049200mg/l0.3377000
8/1/2009404.0030.4323600mg/l0.4039500
9/1/2009341.6730.3947500mg/l0.3326300
10/1/2009309.6730.3732500mg/l0.3021800
11/1/2009187.2540.3353800mg/l0.1846900
12/1/2009223.3330.3019900mg/l0.2189000
1/1/2010187.0030.2754900mg/l0.1847100
2/1/2010227.0030.2459900mg/l0.2146900
3/1/2010242.0030.2293800mg/l0.2329100
4/1/2010258.0030.2207600mg/l0.2515100
6/1/20101316.6730.4461300mg/l1.1117900
7/1/2010397.0030.4881300mg/l0.3857800
9/1/2010367.3360.5847500mg/l0.3625700
10/1/2010264.0030.5862500mg/l0.2560900
11/1/2010239.6730.5169300mg/l0.2292600
12/1/2010165.6730.2867300mg/l0.1616400
1/1/2011515.3330.3104000mg/l0.4822300
2/1/2011227.3330.2965600mg/l0.2234000
3/1/2011297.3330.2848900mg/l0.2952700
4/1/2011324.6730.2950000mg/l0.2995000
5/1/2011607.6730.3563300mg/l0.5862300
6/1/2011602.3330.4291100mg/l0.5966000
7/1/2011335.0030.3990600mg/l0.3332000
8/1/2011455.3330.4370600mg/l0.4496300
9/1/2011240.6730.4276100mg/l0.2369500
10/1/2011242.3330.4138900mg/l0.2358300
11/1/2011249.0030.3541100mg/l0.2467900
12/1/2011445.0030.3278900mg/l0.3453500
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 210.60 492.60
Mean 114.05 69.36 45.42648
Low 75.60 7.0588
No. of Samples 14 285

Five-year Trend Graph

      
1/1/200784.50384.5000000percent (%)83.7400000
2/1/2007144.103114.3000000percent (%)144.0800000
3/1/200788.433105.6800000percent (%)84.3200000
4/1/200786.873100.9800000percent (%)84.0600000
5/1/200740.30388.8400000percent (%)33.6800000
6/1/2007178.103103.7200000percent (%)55.7100000
7/1/200756.73399.0900000percent (%)53.6800000
8/1/200770.23386.7800000percent (%)67.0800000
9/1/200780.70385.4900000percent (%)80.6200000
10/1/2007133.93393.3300000percent (%)132.9900000
11/1/200760.10396.6300000percent (%)58.3200000
12/1/200776.63379.7200000percent (%)75.2400000
1/1/200874.53382.6900000percent (%)73.1000000
2/1/200884.97385.1400000percent (%)77.3800000
3/1/200828.05276.3700000percent (%)27.9300000
4/1/200873.20266.2500000percent (%)55.4400000
5/1/200886.47370.6400000percent (%)80.0000000
6/1/200890.55272.9600000percent (%)85.3100000
9/1/200877.43381.9100000percent (%)77.0100000
10/1/2008119.03393.3700000percent (%)118.8300000
11/1/2008116.103100.7800000percent (%)115.9000000
12/1/2008121.873108.6100000percent (%)118.4200000
1/1/200988.703104.6300000percent (%)88.3900000
2/1/2009107.973105.1800000percent (%)107.2500000
4/1/2009101.973107.3200000percent (%)76.4300000
5/1/2009103.403104.7800000percent (%)101.8100000
6/1/200976.73395.7500000percent (%)47.7400000
7/1/200986.20395.2500000percent (%)85.9700000
8/1/2009102.30394.1200000percent (%)101.9100000
9/1/200975.40391.0000000percent (%)74.6600000
10/1/200983.03387.8400000percent (%)82.4900000
11/1/200978.70383.7300000percent (%)53.3000000
12/1/2009112.80389.7400000percent (%)103.7900000
1/1/2010116.20394.7400000percent (%)114.6100000
2/1/2010128.10299.0400000percent (%)128.0700000
3/1/2010113.973105.4700000percent (%)113.7700000
4/1/2010163.802118.9300000percent (%)158.9400000
7/1/201081.352121.8100000percent (%)81.2800000
9/1/2010134.803126.6500000percent (%)132.9900000
10/1/201083.10399.7500000percent (%)82.1800000
11/1/2010147.303111.6400000percent (%)147.1300000
12/1/2010109.403111.1900000percent (%)108.2700000
1/1/201181.802111.2800000percent (%)81.7300000
2/1/2011137.433115.6400000percent (%)133.7700000
3/1/2011119.603113.1100000percent (%)109.4800000
4/1/2011159.073125.7700000percent (%)155.2200000
5/1/201194.233116.9200000percent (%)92.9400000
Target
percent (%)
Threshold
38.00 percent (%)

Rainfall

Units: inches Year
2011
Historical
period of record
High 39.87 55.94
Mean 12.1356104814814
Low 14.17
No. of Samples 363 4,894

Five-year Trend Graph

      
1/1/20072.79312.7900000inches2.7900000
2/1/20071.76281.7600000inches1.7600000
3/1/20070.31310.3100000inches0.3100000
4/1/20072.56292.5600000inches2.5600000
5/1/20070.96310.9600000inches0.9600000
6/1/20073.18303.1800000inches3.1800000
7/1/20078.28318.2800000inches8.2800000
8/1/20074.65314.6500000inches4.6500000
9/1/20075.15305.1500000inches5.1500000
10/1/20075.48315.4800000inches5.4800000
11/1/20070.22300.2200000inches0.2200000
12/1/20070.89310.8900000inches0.8900000
1/1/20081.89311.8900000inches1.8900000
2/1/20082.16292.1600000inches2.1600000
3/1/20083.02313.0200000inches3.0200000
4/1/20082.62302.6200000inches2.6200000
5/1/20081.86311.8600000inches1.8600000
6/1/20083.91303.9100000inches3.9100000
7/1/20086.83316.8300000inches6.8300000
8/1/20086.03316.0300000inches6.0300000
9/1/20084.26304.2600000inches4.2600000
10/1/20081.63311.6300000inches1.6300000
11/1/20080.69300.6900000inches0.6900000
12/1/20081.43301.4300000inches1.4300000
1/1/20091.56321.5600000inches1.5600000
2/1/20090.56280.5600000inches0.5600000
3/1/20091.22311.2200000inches1.2200000
4/1/20091.64301.6400000inches1.6400000
5/1/20094.54314.5400000inches4.5400000
6/1/20094.21304.2100000inches4.2100000
7/1/20095.75315.7500000inches5.7500000
8/1/20094.99314.9900000inches4.9900000
9/1/20098.83308.8300000inches8.8300000
10/1/20091.00311.0000000inches1.0000000
11/1/20091.53301.5300000inches1.5300000
12/1/20093.03313.0300000inches3.0300000
1/1/20103.95313.9500000inches3.9500000
2/1/20102.11282.1100000inches2.1100000
3/1/20105.09315.0900000inches5.0900000
4/1/20101.38301.3800000inches1.3800000
5/1/20100.87310.8700000inches0.8700000
6/1/20106.31306.3100000inches6.3100000
7/1/20105.45315.4500000inches5.4500000
8/1/201012.113112.1100000inches12.1100000
9/1/20102.24302.2400000inches2.2400000
10/1/20100.01310.0100000inches0.0100000
11/1/20102.77302.7700000inches2.7700000
12/1/20100.86310.8600000inches0.8600000
1/1/20112.83312.8300000inches2.8300000
2/1/20110.73280.7300000inches0.7300000
3/1/20115.81315.8100000inches5.8100000
4/1/20111.49301.4900000inches1.4900000
5/1/20112.21312.2100000inches2.2100000
6/1/20113.24303.2400000inches3.2400000
7/1/20118.71318.7100000inches8.7100000
8/1/20117.69317.6900000inches7.6900000
9/1/20114.01304.0100000inches4.0100000
10/1/20111.88301.8800000inches1.8800000
11/1/20111.10301.1000000inches1.1000000
12/1/20110.16290.1600000inches0.1600000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2011
Historical
period of record
High 0.42 20.48
Mean 0.31 0.43 1.10649
Low 0.16 0.00
No. of Samples 14 443

Five-year Trend Graph

      
1/1/20070.2930.2900000PSS0.2900000
2/1/20070.3330.3100000PSS0.3300000
3/1/20070.3530.3200000PSS0.3500000
4/1/20070.3330.3300000PSS0.3300000
5/1/20070.4030.3400000PSS0.4000000
6/1/20073.2430.8200000PSS0.9800000
7/1/20070.2630.8200000PSS0.2600000
8/1/20070.2830.8100000PSS0.2800000
9/1/20070.2730.8000000PSS0.2700000
10/1/20070.2230.7800000PSS0.2200000
11/1/20070.3130.7600000PSS0.3100000
12/1/20070.3430.2800000PSS0.3400000
1/1/20080.3230.2900000PSS0.3200000
2/1/20080.3630.3000000PSS0.3600000
3/1/20080.3220.3100000PSS0.3200000
4/1/20080.4320.3500000PSS0.4200000
5/1/20080.3530.3500000PSS0.3500000
6/1/20080.4620.3700000PSS0.4500000
7/1/20080.2620.3600000PSS0.2500000
9/1/20080.2930.3600000PSS0.2900000
10/1/20080.3230.3400000PSS0.3200000
11/1/20080.3430.3300000PSS0.3400000
12/1/20080.3230.3100000PSS0.3200000
1/1/20090.3730.3300000PSS0.3700000
2/1/20090.3730.3400000PSS0.3700000
4/1/20090.4130.3600000PSS0.4100000
5/1/20090.2930.3500000PSS0.2900000
6/1/20097.0331.6900000PSS1.2400000
7/1/20090.3231.6800000PSS0.3200000
8/1/20090.2231.6500000PSS0.2200000
9/1/20090.2831.4300000PSS0.2800000
10/1/20090.3331.4100000PSS0.3300000
11/1/20090.3131.4200000PSS0.3100000
12/1/20090.3030.2900000PSS0.3000000
1/1/20100.3130.2900000PSS0.3100000
2/1/20100.3120.3100000PSS0.3000000
3/1/20100.2630.3000000PSS0.2600000
4/1/20103.9520.9100000PSS1.5300000
7/1/20100.2521.1900000PSS0.2400000
9/1/20100.2931.5000000PSS0.2900000
10/1/20100.3330.2900000PSS0.3300000
11/1/20100.2830.2900000PSS0.2800000
12/1/20100.2930.2900000PSS0.2800000
1/1/20110.1920.2800000PSS0.1800000
2/1/20110.3330.2900000PSS0.3300000
3/1/20110.3430.2900000PSS0.3300000
4/1/20110.3230.2900000PSS0.3200000
5/1/20110.3730.3100000PSS0.3700000

Turbidity

Units: NTU Year
2011
Historical
period of record
High 56.40 56.40
Mean 2.86 3.4 5.08926
Low 0.81 0.55
No. of Samples 36 310

Five-year Trend Graph

      
1/1/20075.6935.6900000NTU3.6100000
2/1/20071.7733.7300000NTU1.5600000
3/1/20071.8333.1000000NTU1.6700000
4/1/20071.6532.7400000NTU1.3800000
5/1/20073.4332.8700000NTU2.1900000
6/1/20073.8033.0300000NTU3.2000000
7/1/20074.0332.7500000NTU3.8300000
8/1/20074.7733.2500000NTU4.2600000
9/1/20073.1033.4600000NTU3.0300000
10/1/20072.5333.6100000NTU2.5200000
11/1/20072.8033.5100000NTU2.3900000
12/1/20071.5533.1300000NTU1.4800000
1/1/20082.0032.7900000NTU1.8300000
2/1/20081.9832.3300000NTU1.7900000
3/1/20081.8122.1100000NTU1.7900000
4/1/20081.7131.9800000NTU1.6400000
5/1/20083.0132.0100000NTU2.1600000
6/1/20082.8232.2200000NTU2.1900000
7/1/20081.5622.1500000NTU1.5500000
8/1/20084.8032.6200000NTU4.0400000
9/1/20084.5333.0700000NTU4.2800000
10/1/20084.8333.5900000NTU4.0000000
11/1/20082.1533.4500000NTU1.8100000
12/1/20082.7033.4300000NTU2.5000000
1/1/20093.2133.7000000NTU2.4600000
2/1/20091.8233.2100000NTU1.6100000
3/1/20092.7132.9000000NTU2.3800000
4/1/20093.2532.6400000NTU2.3500000
5/1/20096.5043.3700000NTU5.3000000
6/1/20092.7333.3700000NTU2.2000000
7/1/20091.8733.1500000NTU1.7700000
8/1/20091.9133.1600000NTU1.9000000
9/1/20093.9033.3600000NTU3.7600000
10/1/20092.6233.2600000NTU2.3600000
11/1/20092.1642.5300000NTU1.8900000
12/1/20093.5432.6700000NTU2.6300000
1/1/20107.0733.5300000NTU6.7800000
2/1/20104.7334.0000000NTU4.4600000
3/1/20104.3034.0700000NTU4.2800000
4/1/20102.3034.0200000NTU2.1800000
6/1/20109.1035.5000000NTU7.0500000
7/1/20108.8735.8600000NTU6.6800000
9/1/20106.8066.7700000NTU6.1900000
10/1/20103.9037.1700000NTU3.6100000
11/1/20102.8636.3100000NTU2.5200000
12/1/20105.0735.5000000NTU4.2300000
1/1/201127.2739.1800000NTU20.7800000
2/1/20113.4338.2200000NTU3.2500000
3/1/20113.2037.6200000NTU2.9000000
4/1/20111.4037.2100000NTU1.3500000
5/1/20111.9637.0600000NTU1.8200000
6/1/20113.7336.8300000NTU3.4100000
7/1/20112.1432.6400000NTU1.7600000
8/1/20114.4332.8100000NTU4.1600000
9/1/20112.0432.6200000NTU1.8600000
10/1/20112.3232.7700000NTU2.2400000
11/1/20116.1433.4700000NTU2.7500000
12/1/20113.2333.3800000NTU2.1300000
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:
  • 1936

Chlorophyll a

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

Five-year Trend Graph

     
1/1/20073.3910.0033900mg/l0.0033900
2/1/20072.9610.0031800mg/l0.0029600
3/1/20071.7010.0026800mg/l0.0017000
4/1/20079.4510.0043800mg/l0.0094500
5/1/20077.7510.0050500mg/l0.0077500
6/1/200738.4010.0106100mg/l0.0384000
7/1/20078.3810.0114400mg/l0.0083800
8/1/200716.2010.0136500mg/l0.0162000
10/1/200723.5010.0188500mg/l0.0235000
11/1/200716.1010.0205200mg/l0.0161000
12/1/20078.8410.0146000mg/l0.0088400
1/1/200817.2030.0163700mg/l0.0113400
2/1/20080.6010.0132500mg/l0.0006000
3/1/200815.7330.0136600mg/l0.0128000
4/1/200810.7030.0115300mg/l0.0078200
5/1/20087.3310.0100700mg/l0.0073300
6/1/200851.5020.0171800mg/l0.0415000
7/1/200820.0020.0176400mg/l0.0196000
9/1/200896.0020.0371100mg/l0.0929500
10/1/200854.5020.0458700mg/l0.0539800
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

     
1/1/2007700.0010.7000000mg/l0.7000000
2/1/2007296.0010.4980000mg/l0.2960000
3/1/2007207.0010.4010000mg/l0.2070000
4/1/2007-999000.001-249.4492500mg/l0
5/1/2007202.001-199.5190000mg/l0.2020000
6/1/2007316.001-166.2131700mg/l0.3160000
7/1/2007603.001-166.2293300mg/l0.6030000
8/1/2007875.001-166.1328300mg/l0.8750000
10/1/2007783.0010.5558000mg/l0.7830000
11/1/2007262.0010.5678000mg/l0.2620000
12/1/2007198.0010.5442000mg/l0.1980000
1/1/2008815.6730.5867300mg/l0.7167100
2/1/2008388.0010.4893300mg/l0.3880000
3/1/2008819.6730.5443900mg/l0.7390500
4/1/20081034.6730.5863400mg/l1.0036700
5/1/2008277.0010.5888400mg/l0.2770000
6/1/20081125.5020.7434200mg/l1.1110900
7/1/20081077.5020.7870600mg/l1.0756900
9/1/20081471.0020.9971300mg/l1.4642300
10/1/20081299.0021.0500000mg/l1.2986300

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

     
1/1/2007123.0010.1230000mg/l0.1230000
2/1/200761.0010.0920000mg/l0.0610000
3/1/2007112.0010.0986700mg/l0.1120000
4/1/200781.0010.0942500mg/l0.0810000
5/1/200776.0010.0906000mg/l0.0760000
6/1/2007104.0010.0928300mg/l0.1040000
7/1/2007214.0010.1080000mg/l0.2140000
8/1/2007184.0010.1285000mg/l0.1840000
10/1/2007271.0010.1698000mg/l0.2710000
11/1/2007106.0010.1758000mg/l0.1060000
12/1/2007105.0010.1760000mg/l0.1050000
1/1/2008120.0030.1572000mg/l0.1126100
2/1/2008189.0010.1582000mg/l0.1890000
3/1/2008235.6730.1711100mg/l0.2339500
4/1/2008172.0030.1546100mg/l0.1655300
5/1/2008131.0010.1587800mg/l0.1310000
6/1/2008305.0020.1921100mg/l0.3000000
7/1/2008370.0020.2337800mg/l0.3612500
9/1/2008290.0020.2536000mg/l0.2900000
10/1/2008375.0020.2942000mg/l0.3722900
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

     
1/1/200779.70179.7000000percent (%)79.7000000
2/1/2007149.901114.8000000percent (%)149.9000000
3/1/200757.30195.6300000percent (%)57.3000000
4/1/200772.50189.8500000percent (%)72.5000000
5/1/200725.00176.8800000percent (%)25.0000000
6/1/200755.70173.3500000percent (%)55.7000000
7/1/200738.30166.4500000percent (%)38.3000000
8/1/200746.80149.2700000percent (%)46.8000000
10/1/200779.00148.9600000percent (%)79.0000000
11/1/200740.40152.0400000percent (%)40.4000000
12/1/200766.90154.2800000percent (%)66.9000000
1/1/200862.30359.0800000percent (%)58.1500000
2/1/200828.70155.4600000percent (%)28.7000000
3/1/200834.63351.9900000percent (%)31.0300000
4/1/200862.70349.2700000percent (%)52.8600000
5/1/200872.60154.6400000percent (%)72.6000000
6/1/200835.45249.4000000percent (%)35.1800000
7/1/200880.80252.4800000percent (%)80.3200000
9/1/200868.75464.0600000percent (%)66.8500000
10/1/200850.85261.6900000percent (%)49.0700000
Target
percent (%)
Threshold
56.00 percent (%)

Oysters

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

Five-year Trend Graph

     

Rainfall

Units: inches Year
2011
Historical
period of record
High 39.9 55.9
Mean 12.1356104814814
Low 14.17
No. of Samples 363 4,894

Five-year Trend Graph

     
1/1/20072.79312.7900000inches2.7900000
2/1/20071.76281.7600000inches1.7600000
3/1/20070.31310.3100000inches0.3100000
4/1/20072.56292.5600000inches2.5600000
5/1/20070.96310.9600000inches0.9600000
6/1/20073.18303.1800000inches3.1800000
7/1/20078.28318.2800000inches8.2800000
8/1/20074.65314.6500000inches4.6500000
9/1/20075.15305.1500000inches5.1500000
10/1/20075.48315.4800000inches5.4800000
11/1/20070.22300.2200000inches0.2200000
12/1/20070.89310.8900000inches0.8900000
1/1/20081.89311.8900000inches1.8900000
2/1/20082.16292.1600000inches2.1600000
3/1/20083.02313.0200000inches3.0200000
4/1/20082.62302.6200000inches2.6200000
5/1/20081.86311.8600000inches1.8600000
6/1/20083.91303.9100000inches3.9100000
7/1/20086.83316.8300000inches6.8300000
8/1/20086.03316.0300000inches6.0300000
9/1/20084.26304.2600000inches4.2600000
10/1/20081.63311.6300000inches1.6300000
11/1/20080.69300.6900000inches0.6900000
12/1/20081.43301.4300000inches1.4300000
1/1/20091.56321.5600000inches1.5600000
2/1/20090.56280.5600000inches0.5600000
3/1/20091.22311.2200000inches1.2200000
4/1/20091.64301.6400000inches1.6400000
5/1/20094.54314.5400000inches4.5400000
6/1/20094.21304.2100000inches4.2100000
7/1/20095.75315.7500000inches5.7500000
8/1/20094.99314.9900000inches4.9900000
9/1/20098.83308.8300000inches8.8300000
10/1/20091.00311.0000000inches1.0000000
11/1/20091.53301.5300000inches1.5300000
12/1/20093.03313.0300000inches3.0300000
1/1/20103.95313.9500000inches3.9500000
2/1/20102.11282.1100000inches2.1100000
3/1/20105.09315.0900000inches5.0900000
4/1/20101.38301.3800000inches1.3800000
5/1/20100.87310.8700000inches0.8700000
6/1/20106.31306.3100000inches6.3100000
7/1/20105.45315.4500000inches5.4500000
8/1/201012.113112.1100000inches12.1100000
9/1/20102.24302.2400000inches2.2400000
10/1/20100.01310.0100000inches0.0100000
11/1/20102.77302.7700000inches2.7700000
12/1/20100.86310.8600000inches0.8600000
1/1/20112.83312.8300000inches2.8300000
2/1/20110.73280.7300000inches0.7300000
3/1/20115.81315.8100000inches5.8100000
4/1/20111.49301.4900000inches1.4900000
5/1/20112.21312.2100000inches2.2100000
6/1/20113.24303.2400000inches3.2400000
7/1/20118.71318.7100000inches8.7100000
8/1/20117.69317.6900000inches7.6900000
9/1/20114.01304.0100000inches4.0100000
10/1/20111.88301.8800000inches1.8800000
11/1/20111.10301.1000000inches1.1000000
12/1/20110.16290.1600000inches0.1600000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2011
Historical
period of record
High 33.9 45.0
Mean 31.76 5.57 15.43408
Low 27.20 0.00
No. of Samples 14 2,757

Five-year Trend Graph

     
1/1/20071.07761.0700000PSS0.6500000
2/1/20071.19821.1300000PSS0.7800000
3/1/20071.19821.1500000PSS0.7700000
4/1/20070.669421.0300000PSS0.6200000
5/1/200734.8017.7800000PSS34.8000000
6/1/200736.52112.5700000PSS36.5200000
7/1/200734.75118.1900000PSS34.7500000
8/1/200735.75123.9500000PSS35.7500000
10/1/200735.53135.4700000PSS35.5300000
11/1/200735.68135.6500000PSS35.6800000
12/1/200736.56135.6500000PSS36.5600000
1/1/200829.64334.6300000PSS29.3200000
2/1/200835.46134.5700000PSS35.4600000
3/1/200834.53334.5700000PSS34.5000000
4/1/200833.72334.2700000PSS33.6600000
5/1/200836.95134.4800000PSS36.9500000
6/1/200834.79434.1800000PSS34.7400000
7/1/200822.15232.9300000PSS19.2000000
9/1/200824.24630.3700000PSS19.8200000
10/1/200834.90230.6100000PSS34.8900000
2/1/200936.80231.9800000PSS36.8000000
8/1/200937.55237.5500000PSS37.5500000
9/1/200937.30237.4300000PSS37.3000000
10/1/200935.88636.9100000PSS35.8500000
12/1/200926.65234.3500000PSS26.1900000
2/1/201030.70232.6300000PSS30.7000000
3/1/201030.50230.9300000PSS30.5000000
4/1/201030.40229.5600000PSS30.4000000
5/1/201035.95230.8400000PSS35.9500000
7/1/201032.00231.9100000PSS32.0000000
9/1/201032.52632.7200000PSS32.4300000
11/1/201037.25233.9200000PSS37.2500000
2/1/201130.80233.5200000PSS30.8000000
3/1/201132.40233.4800000PSS32.4000000
4/1/201131.10232.8900000PSS31.1000000
9/1/201131.47631.2900000PSS31.4000000
10/1/201133.90232.6900000PSS33.9000000

Turbidity

Units: NTU Year
2011
Historical
period of record
High 4.6 31.3
Mean 2.68 3.53 3.52489
Low 2.00 0.62
No. of Samples 7 408

Five-year Trend Graph

     
1/1/20073.5013.5000000NTU3.5000000
2/1/20071.6012.5500000NTU1.6000000
3/1/20071.5122.2000000NTU1.5100000
4/1/20073.5012.5300000NTU3.5000000
5/1/20073.6012.7400000NTU3.6000000
6/1/20074.5013.0400000NTU4.5000000
7/1/20073.5013.0400000NTU3.5000000
8/1/20072.7023.2200000NTU2.6500000
10/1/20075.1013.8800000NTU5.1000000
11/1/20075.6014.2800000NTU5.6000000
12/1/20072.7013.9200000NTU2.7000000
1/1/20083.8033.9800000NTU3.4200000
2/1/20084.9014.4200000NTU4.9000000
3/1/20083.4334.2600000NTU3.3700000
4/1/20084.2334.1100000NTU3.8200000
5/1/20082.5013.5900000NTU2.5000000
6/1/20087.1034.3300000NTU5.1100000
7/1/20083.6524.3000000NTU3.6500000
9/1/20084.2734.3500000NTU4.0400000
10/1/20084.6524.4300000NTU4.6500000
2/1/20092.8013.9100000NTU2.8000000
8/1/20092.2012.2000000NTU2.2000000
9/1/20092.9012.5500000NTU2.9000000
10/1/20092.3332.4800000NTU2.3000000
12/1/20092.8012.5600000NTU2.8000000
2/1/20103.6012.9100000NTU3.6000000
3/1/20102.4012.7800000NTU2.4000000
4/1/20105.1013.4800000NTU5.1000000
5/1/20102.9013.3600000NTU2.9000000
7/1/20102.6013.3200000NTU2.6000000
9/1/20103.9733.6400000NTU3.8600000
11/1/20104.4313.6700000NTU4.4300000
2/1/20112.1013.5000000NTU2.1000000
3/1/20112.4012.9800000NTU2.4000000
4/1/20113.6013.1300000NTU3.6000000
9/1/20112.3032.9500000NTU2.2900000
10/1/20114.6013.4500000NTU4.6000000
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

Whitaker Bayou is located within the Sarasota Bay Watershed. View details about the Sarasota Bay Watershed »

Rain that falls on land that is in a natural state is absorbed and filtered by soils and vegetation as it makes it way into underground aquifers. However, in developed areas, "impervious surfaces" impede this process and contribute to polluted urban runoff entering surface waters. These surfaces include human infrastructure like roads, sidewalks, driveways and parking lots that are covered by impenetrable materials such as asphalt, concrete, brick and stone, as well as buildings and other permanent structures. Soils that have been disturbed and compacted by urban development are often impervious as well. Learn more about Impervious Features »

The Sarasota County Stormwater Environmental Utility (SEU) mapped impervious surfaces in the County in 2013. A map showing impervious surfaces can be viewed using the Water Atlas Map Viewer tool.

of the land area within the Whitaker Bayou Basin is covered by impervious surfaces.

Loading interactive chart...

Land Use / Land Cover

Whitaker Bayou is located within the Sarasota Bay Watershed. View details about the Sarasota Bay Watershed »

Land use within a creek's watershed has a major effect on its water quality. In general, less development means better water quality. Land Cover/Land Use classifications categorize land in terms of its observed physical surface characteristics (e.g. upland or wetland), and also reflect the types of activity that are taking place on it (agriculture, urban/built-up, utilities, etc.). Florida uses as its standard a set of statewide classifications which were developed by the Florida Department of Transportation. Learn more about Land Use and Land Cover »

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.