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Hudson Bayou Condition Report for 2016

View 2015 Report

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: 2,406 acres
  • Location: North Sarasota County
  • Discharges into: Sarasota Bay

The Hudson Bayou Basin is entirely within the bounds of the City of Sarasota. Its surface water system has undergone significant alteration over the past century. The Sarasota County 1847 General Land Office Survey does not confirm Hudson Bayou but does show a few inland waterways. The 1959 USDA NRCS Soil Survey Map shows that Hudson Bayou extended about 1 mile inland from the bay through somewhat poorly drained soil associated with flatwoods. The survey also shows an area of well-drained soil likely consisting of scrub land north of the bayou, which continues north along the coast. For 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:
  • 1953A
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2016
Historical
period of record
High 0.0029 0.1568
Mean 0.0006 0.0013 0.01314429
Low 0.0003 0.0002
No. of Samples 29 535

Five-year Trend Graph

      
1/1/20122.6560.0026500mg/l0.0018100
2/1/20126.6460.0046500mg/l0.0024800
3/1/20125.9660.0050800mg/l0.0033200
4/1/20123.1360.0046000mg/l0.0019700
5/1/201280.6560.0198100mg/l0.0265300
6/1/20120.6260.0166100mg/l0.0006200
7/1/20120.6860.0162800mg/l0.0006000
8/1/20121.7160.0154600mg/l0.0017000
9/1/20120.4360.0145400mg/l0.0004100
10/1/20120.3460.0140700mg/l0.0003300
11/1/20124.6060.0014000mg/l0.0020900
12/1/20120.5460.0013800mg/l0.0004600
1/1/20131.7760.0015700mg/l0.0014900
2/1/20136.3460.0023400mg/l0.0030500
3/1/20131.1860.0024600mg/l0.0010200
4/1/20132.2460.0027800mg/l0.0021400
5/1/20133.2160.0025500mg/l0.0019500
6/1/20131.0360.0026300mg/l0.0009700
7/1/20130.6860.0024500mg/l0.0006400
8/1/20130.4760.0014700mg/l0.0004700
9/1/20130.4060.0013400mg/l0.0003700
10/1/20130.7560.0010900mg/l0.0007100
11/1/20130.4640.0006300mg/l0.0004000
12/1/20130.5760.0005600mg/l0.0004700
1/1/20140.4060.0005100mg/l0.0003700
2/1/20140.8570.0005700mg/l0.0008300
3/1/20142.1570.0008600mg/l0.0018400
4/1/20143.2270.0012800mg/l0.0024500
5/1/20140.9180.0013500mg/l0.0008900
6/1/20144.0080.0019200mg/l0.0026600
7/1/20140.4860.0019400mg/l0.0004700
8/1/20141.5570.0020500mg/l0.0009400
9/1/20141.5980.0019600mg/l0.0015800
10/1/20142.9070.0019100mg/l0.0021200
11/1/20140.5060.0018400mg/l0.0005000
12/1/20140.2960.0012200mg/l0.0002900
1/1/20151.1660.0013300mg/l0.0009300
2/1/20152.3660.0014700mg/l0.0022600
3/1/20152.6660.0016500mg/l0.0026500
4/1/20154.3440.0018900mg/l0.0041900
5/1/20153.0440.0023100mg/l0.0022500
6/1/20154.0760.0029400mg/l0.0032700
7/1/20150.7340.0028700mg/l0.0007300
8/1/20150.9940.0026400mg/l0.0009700
9/1/20151.0040.0023600mg/l0.0010000
10/1/201545.7940.0092700mg/l0.0094700
11/1/20150.3740.0088300mg/l0.0003600
1/1/20160.2560.0096800mg/l0.0002500
2/1/20160.7820.0096400mg/l0.0007600
3/1/20160.3920.0095200mg/l0.0003900
4/1/20161.5420.0006700mg/l0.0014100
5/1/20161.1020.0008100mg/l0.0010800
6/1/20160.7320.0008000mg/l0.0007100
7/1/20160.7520.0008800mg/l0.0007000
8/1/20160.9720.0009100mg/l0.0008900
9/1/20160.3230.0009000mg/l0.0003100
10/1/20161.2920.0008600mg/l0.0008100
11/1/20160.8520.0008200mg/l0.0006000
12/1/20161.6120.0009700mg/l0.0009800
Target
mg/l
Threshold
0.02 mg/l
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2016
Historical
period of record
High 1.91 3.059
Mean 1.2704 0.9047 0.39127501
Low 0.871 0.054
No. of Samples 19 250

Five-year Trend Graph

      
1/1/2012832.0020.8320000mg/l0.8273300
2/1/2012847.0020.8395000mg/l0.8435800
3/1/20121024.0020.9010000mg/l0.9293400
4/1/2012854.5020.8893800mg/l0.8190700
5/1/20121207.5020.9530000mg/l1.0121400
6/1/20121247.0021.0020000mg/l1.2466400
7/1/2012988.0021.0280000mg/l0.9869300
8/1/2012772.5021.0155800mg/l0.7690000
9/1/2012936.0021.0009200mg/l0.9331500
10/1/20121027.0021.0296700mg/l1.0218200
11/1/2012945.5020.9860000mg/l0.9336100
12/1/2012873.0020.9236700mg/l0.8594900
1/1/2013741.0020.8825000mg/l0.7293300
2/1/2013980.0020.9170800mg/l0.9556700
3/1/2013658.5020.8708300mg/l0.6533100
4/1/2013174.0020.7286700mg/l0.1260000
5/1/20131111.5020.7563300mg/l1.0239000
6/1/2013919.0020.7640000mg/l0.8978600
7/1/20131325.0020.8613300mg/l1.3241700
8/1/20131125.0020.8855000mg/l1.1248200
9/1/20131162.5020.9695000mg/l1.1569500
10/1/20131151.0021.1323300mg/l1.1484200
12/1/20131110.5021.1748000mg/l1.1089600
1/1/20141035.0041.1168000mg/l1.0111300
2/1/20141039.0041.0996000mg/l1.0374400
3/1/2014878.5041.0428000mg/l0.8732900
4/1/20141746.5041.1619000mg/l1.6192300
5/1/2014885.0041.1157500mg/l0.8832300
6/1/20142455.0021.3398300mg/l2.3795400
7/1/20141086.0021.3483300mg/l1.0818400
8/1/2014899.0021.3250000mg/l0.8923700
9/1/20141259.5021.3885000mg/l1.2580500
10/1/20141336.0041.3200800mg/l1.3359400
11/1/2014905.5041.3235000mg/l0.9045500
12/1/20141017.5041.0839200mg/l1.0166900
1/1/2015929.5021.0578300mg/l0.9277800
2/1/20151243.0021.1151700mg/l1.2178000
3/1/20152509.0021.3234200mg/l2.5014100
6/1/20151211.5021.4732500mg/l1.2084800
1/1/20161004.5021.0045000mg/l0.9998500
2/1/2016958.5020.9815000mg/l0.9545000
3/1/2016938.0010.9670000mg/l0.9380000
5/1/20161188.5021.0223800mg/l1.1719800
6/1/20161468.5021.1116000mg/l1.4618600
7/1/20161320.0021.1747000mg/l1.3193900
8/1/20161581.5021.2993000mg/l1.5814900
9/1/20161845.0021.4807000mg/l1.8438500
10/1/20161347.5021.4585000mg/l1.3474800
11/1/20161207.0011.4615800mg/l1.2070000
12/1/20161160.0011.4101700mg/l1.1600000
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2016
Historical
period of record
High 0.803 4.05
Mean 0.3637 0.455 0.37769078
Low 0.132 0.132
No. of Samples 27 553

Five-year Trend Graph

      
1/1/2012658.5060.6585000mg/l0.5059200
2/1/2012620.0060.6392500mg/l0.5304300
3/1/2012913.5060.7306700mg/l0.8531600
4/1/2012839.5060.7578800mg/l0.7146500
5/1/20121100.0060.8263000mg/l1.0554100
6/1/2012337.5060.7448300mg/l0.3374700
7/1/2012435.5060.7076700mg/l0.3823500
8/1/2012275.0060.6501700mg/l0.2748200
9/1/2012468.5060.5760000mg/l0.3946300
10/1/2012415.5060.5053300mg/l0.3931300
11/1/2012448.5060.3967500mg/l0.3960300
12/1/2012532.5060.4292500mg/l0.4730500
1/1/2013487.5060.4379200mg/l0.4246100
2/1/2013913.0060.5442500mg/l0.7156000
3/1/2013669.0060.5776700mg/l0.5912600
4/1/2013635.5060.6143300mg/l0.5657300
5/1/2013958.5060.6993300mg/l0.8345100
6/1/2013333.5060.6661700mg/l0.3207000
7/1/2013527.5060.6728300mg/l0.4569700
8/1/2013425.0060.5915000mg/l0.4105200
9/1/2013369.0060.5415000mg/l0.3442000
10/1/2013420.5060.5056700mg/l0.3952600
11/1/2013441.5040.4195000mg/l0.4143300
12/1/2013464.0060.4412500mg/l0.4250900
1/1/2014359.0080.4131700mg/l0.3167300
2/1/2014417.0080.4118300mg/l0.3909800
3/1/2014314.5080.4027500mg/l0.3026500
4/1/2014457.5080.4089200mg/l0.3957700
5/1/2014419.5080.4052500mg/l0.3867500
6/1/2014597.5080.4275000mg/l0.5377200
7/1/2014521.0080.4545000mg/l0.5161400
8/1/2014661.0080.4951700mg/l0.6544200
9/1/2014533.5080.5316700mg/l0.5288200
10/1/2014300.5080.5055000mg/l0.2945500
11/1/2014378.5080.4986700mg/l0.3304900
12/1/2014415.5080.4683300mg/l0.3605500
1/1/2015480.5060.4615800mg/l0.4112500
2/1/2015268.0060.3960800mg/l0.2667400
3/1/2015871.0060.4523300mg/l0.8635100
4/1/2015558.5040.4953300mg/l0.4929700
5/1/2015661.0040.5424200mg/l0.6208000
6/1/2015509.5060.5580800mg/l0.4861400
7/1/2015430.5040.5497500mg/l0.4086200
8/1/2015476.5040.5845000mg/l0.4719800
9/1/2015413.5040.5082500mg/l0.3920300
10/1/2015383.5040.4790800mg/l0.3430200
11/1/2015492.5040.4510000mg/l0.4545800
1/1/2016275.0060.4082000mg/l0.2529100
2/1/2016317.5020.3764000mg/l0.2576700
3/1/2016537.0020.4011000mg/l0.4861900
4/1/2016507.5020.4259000mg/l0.4500700
5/1/2016520.0020.4314000mg/l0.4944500
6/1/2016480.0020.4395000mg/l0.4650200
7/1/2016570.0020.4886700mg/l0.5202000
8/1/2016363.0020.4962500mg/l0.3503500
9/1/2016384.0020.4707500mg/l0.3723200
10/1/2016498.0020.4691700mg/l0.4422300
11/1/2016242.0010.4228300mg/l0.2420000
12/1/2016393.5020.4084200mg/l0.3790900
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
2016
Historical
period of record
High 860.00 860.00
Mean 63.82 53.14 45.12019
Low 10.10 4.20
No. of Samples 28 577

Five-year Trend Graph

      
1/1/201260.25660.2500000percent (%)52.6700000
2/1/201262.50661.3800000percent (%)56.9300000
3/1/201270.00664.2500000percent (%)50.4800000
4/1/201250.05660.7000000percent (%)44.5300000
5/1/201228.80654.3200000percent (%)20.0200000
7/1/201222.80646.8300000percent (%)48.4000000
8/1/201260.65646.4600000percent (%)60.3000000
9/1/201279.70648.4000000percent (%)77.6200000
10/1/201258.40650.0700000percent (%)50.9200000
11/1/201250.60654.4300000percent (%)38.3600000
12/1/201259.15655.2200000percent (%)50.4700000
1/1/201396.40667.4800000percent (%)96.2800000
2/1/201328.60662.1400000percent (%)22.7700000
3/1/201366.691259.9700000percent (%)64.1400000
4/1/201330.15655.2700000percent (%)24.7300000
5/1/201341.52953.7500000percent (%)35.9400000
6/1/201327.35648.4500000percent (%)25.4000000
7/1/201349.74940.6800000percent (%)46.2900000
8/1/201362.65646.3500000percent (%)62.3700000
9/1/201363.55645.8300000percent (%)63.2400000
10/1/201362.90651.2900000percent (%)61.2500000
11/1/201374.07356.7100000percent (%)73.8600000
12/1/201354.45661.2300000percent (%)51.3400000
1/1/201448.55861.0300000percent (%)45.6800000
2/1/201484.50864.6700000percent (%)75.6700000
3/1/2014100.65870.8500000percent (%)100.4500000
4/1/201466.55871.4600000percent (%)65.2600000
5/1/201438.50865.5300000percent (%)35.1500000
6/1/201445.95864.1200000percent (%)37.7800000
7/1/201463.50866.6100000percent (%)61.1300000
8/1/201434.55858.2800000percent (%)30.0500000
9/1/201445.65849.1200000percent (%)42.5100000
10/1/201469.25849.5700000percent (%)69.2400000
11/1/201457.65852.7600000percent (%)55.1000000
12/1/201473.60857.3700000percent (%)63.5700000
1/1/201557.95656.4400000percent (%)55.5100000
2/1/201565.85661.6600000percent (%)64.3300000
3/1/201558.85663.8600000percent (%)57.6900000
6/1/201551.70658.5900000percent (%)51.4200000
7/1/201563.10459.8800000percent (%)63.0200000
8/1/201565.80459.8600000percent (%)65.7900000
9/1/201581.80465.6000000percent (%)80.8700000
10/1/201554.35463.3500000percent (%)50.4400000
11/1/201543.75460.0800000percent (%)37.1900000
1/1/201686.40666.4200000percent (%)85.2900000
2/1/201686.80270.6200000percent (%)85.2700000
3/1/201650.40264.3400000percent (%)44.6900000
4/1/2016450.452143.5600000percent (%)187.5500000
5/1/201656.052146.0200000percent (%)42.2300000
6/1/201662.952132.1800000percent (%)59.9000000
7/1/201657.102127.2900000percent (%)53.2900000
8/1/201662.252123.2000000percent (%)60.9700000
9/1/201645.902122.4500000percent (%)45.8400000
10/1/201686.45261.7800000percent (%)86.4000000
11/1/201652.90261.2600000percent (%)43.8400000
12/1/201647.75258.7300000percent (%)29.3700000
Target
percent (%)
Threshold
38.00 percent (%)

Rainfall

Units: inches Year
2016
Historical
period of record
High 41.66 53.67
Mean 12.6118057373258
Low 11.33
No. of Samples 366 4,750

Five-year Trend Graph

      
1/1/20120.31290.3100000inches0.3100000
2/1/20120.62290.6200000inches0.6200000
3/1/20121.72311.7200000inches1.7200000
4/1/20122.59242.5900000inches2.5900000
5/1/20121.20311.2000000inches1.2000000
6/1/201216.373016.3700000inches16.3700000
7/1/20123.13313.1300000inches3.1300000
8/1/20125.55315.5500000inches5.5500000
9/1/20122.57302.5700000inches2.5700000
10/1/20123.90313.9000000inches3.9000000
11/1/20120.01280.0100000inches0.0100000
12/1/20121.21311.2100000inches1.2100000
1/1/20130.19310.1900000inches0.1900000
2/1/20131.07231.0700000inches1.0700000
3/1/20131.38311.3800000inches1.3800000
4/1/20133.54303.5400000inches3.5400000
5/1/20133.07313.0700000inches3.0700000
6/1/201311.733011.7300000inches11.7300000
7/1/20137.96317.9600000inches7.9600000
8/1/201311.863111.8600000inches11.8600000
9/1/201310.963010.9600000inches10.9600000
10/1/20131.26311.2600000inches1.2600000
11/1/20130.58300.5800000inches0.5800000
12/1/20130.07310.0700000inches0.0700000
1/1/20142.29312.2900000inches2.2900000
2/1/20143.09283.0900000inches3.0900000
3/1/20144.87314.8700000inches4.8700000
4/1/20141.40291.4000000inches1.4000000
5/1/20145.78315.7800000inches5.7800000
6/1/20143.18303.1800000inches3.1800000
7/1/20144.32314.3200000inches4.3200000
8/1/20141.51281.5100000inches1.5100000
9/1/20146.61256.6100000inches6.6100000
10/1/20142.09292.0900000inches2.0900000
11/1/20142.69302.6900000inches2.6900000
12/1/20140.34310.3400000inches0.3400000
1/1/20151.52311.5200000inches1.5200000
2/1/20153.29283.2900000inches3.2900000
3/1/20150.87310.8700000inches0.8700000
4/1/20151.06301.0600000inches1.0600000
5/1/20152.77312.7700000inches2.7700000
6/1/20155.62305.6200000inches5.6200000
7/1/20158.99318.9900000inches8.9900000
8/1/20155.48315.4800000inches5.4800000
9/1/20156.00306.0000000inches6.0000000
10/1/20152.70312.7000000inches2.7000000
11/1/20150.54300.5400000inches0.5400000
12/1/20151.74311.7400000inches1.7400000
1/1/20164.85314.8500000inches4.8500000
2/1/20161.63291.6300000inches1.6300000
3/1/20161.93311.9300000inches1.9300000
4/1/20160.39300.3900000inches0.3900000
5/1/20164.55314.5500000inches4.5500000
6/1/20167.00307.0000000inches7.0000000
7/1/20163.59313.5900000inches3.5900000
8/1/201611.083111.0800000inches11.0800000
9/1/20163.88303.8800000inches3.8800000
10/1/20162.48312.4800000inches2.4800000
11/1/20160.04300.0400000inches0.0400000
12/1/20160.24310.2400000inches0.2400000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2016
Historical
period of record
High 17.95 17.95
Mean 0.43 0.38 1.72851
Low 0.13 0.04
No. of Samples 27 466

Five-year Trend Graph

      
1/1/20120.4760.4700000PSS0.4600000
2/1/20120.3760.4200000PSS0.3600000
3/1/20120.3260.3900000PSS0.3100000
4/1/20120.3660.3800000PSS0.3500000
5/1/20120.4560.3900000PSS0.4500000
7/1/20120.3960.3800000PSS0.3700000
8/1/20120.1360.3300000PSS0.1200000
9/1/20120.4260.3500000PSS0.4000000
10/1/20120.4360.3600000PSS0.4100000
11/1/20126.2961.5300000PSS2.2100000
12/1/20120.4361.3500000PSS0.4200000
1/1/20130.3761.3500000PSS0.3700000
2/1/20130.3661.3800000PSS0.3600000
3/1/20130.4261.3800000PSS0.4200000
4/1/20131.8361.6200000PSS1.0900000
5/1/20130.3460.6300000PSS0.3400000
6/1/20130.2660.6000000PSS0.2400000
7/1/20130.4560.6100000PSS0.4300000
8/1/20130.3460.6100000PSS0.3300000
9/1/20130.4260.6100000PSS0.4000000
10/1/20130.4060.3700000PSS0.3700000
12/1/20130.4060.4000000PSS0.3900000
1/1/20140.4180.3900000PSS0.3900000
2/1/20140.4280.4100000PSS0.4000000
3/1/20140.2380.3700000PSS0.2100000
4/1/20140.6680.4200000PSS0.5500000
5/1/20140.3080.4000000PSS0.2700000
6/1/20140.4180.4100000PSS0.4000000
7/1/20140.3380.3900000PSS0.3100000
8/1/20140.4280.3900000PSS0.4200000
9/1/20140.3080.4000000PSS0.2900000
10/1/20140.2180.3300000PSS0.2000000
11/1/20140.3380.3300000PSS0.3200000
12/1/20140.3780.3300000PSS0.3500000
1/1/20153.7560.9000000PSS1.5600000
2/1/20150.4060.8900000PSS0.3900000
3/1/20150.1160.8600000PSS0.1100000
6/1/20150.3961.1600000PSS0.3800000
7/1/20150.3440.3100000PSS0.3200000
8/1/20150.3340.2900000PSS0.3100000
9/1/20150.3240.3500000PSS0.3000000
10/1/20156.3341.5400000PSS1.6900000
11/1/20150.3541.3400000PSS0.3400000
1/1/20160.3961.5400000PSS0.3700000
2/1/20160.3821.5500000PSS0.3600000
3/1/20160.2421.5400000PSS0.2400000
4/1/20160.4710.3700000PSS0.4700000
5/1/20160.3320.3600000PSS0.3300000
6/1/20160.3920.3700000PSS0.3700000
7/1/20160.3120.3500000PSS0.3000000
8/1/20160.3120.3400000PSS0.2700000
9/1/20160.3320.3600000PSS0.2900000
10/1/20160.4120.3500000PSS0.3900000
11/1/20169.1221.8100000PSS2.2400000
12/1/20167.0222.9200000PSS1.3400000

Turbidity

Units: NTU Year
2016
Historical
period of record
High 9.50 38.00
Mean 3.42 3.63 4.10181
Low 1.20 1.00
No. of Samples 29 554

Five-year Trend Graph

      
1/1/20121.9061.9000000NTU1.8000000
2/1/20122.3062.1000000NTU2.2900000
3/1/201214.0066.0700000NTU7.2100000
4/1/20124.1865.6000000NTU3.4000000
5/1/20127.1565.9100000NTU6.5600000
6/1/20124.0065.5900000NTU3.9900000
7/1/20122.8065.7400000NTU2.7300000
8/1/201211.0067.1900000NTU11.0000000
9/1/20124.5565.6100000NTU4.3700000
10/1/20124.3065.6300000NTU3.9500000
11/1/20129.6566.0500000NTU8.5100000
12/1/20125.0566.2300000NTU4.9400000
1/1/20132.3066.1400000NTU2.2900000
2/1/20136.1565.3300000NTU5.0200000
3/1/20132.1064.9300000NTU2.1000000
4/1/20133.1064.7300000NTU3.1000000
5/1/20133.2563.6600000NTU3.2300000
6/1/20132.7563.2800000NTU2.7500000
7/1/20134.1063.5800000NTU3.6800000
8/1/20133.4563.1300000NTU3.4500000
9/1/20134.4563.5200000NTU4.3900000
10/1/20133.8063.6300000NTU3.7800000
11/1/20135.8044.0600000NTU5.6300000
12/1/20136.7564.7300000NTU6.6500000
1/1/20142.2584.4200000NTU2.2400000
2/1/20143.2084.3800000NTU2.8300000
3/1/20144.9084.4500000NTU4.8700000
4/1/201419.4587.0600000NTU13.9500000
5/1/20143.3086.6400000NTU3.2800000
6/1/20144.2086.2200000NTU4.2000000
7/1/20144.2586.5500000NTU4.1400000
8/1/20142.1086.3700000NTU1.9800000
9/1/20147.5586.8100000NTU6.1000000
10/1/20144.7584.3600000NTU4.5800000
11/1/20142.7584.2700000NTU2.6900000
12/1/20144.9084.3800000NTU3.4300000
1/1/20154.2064.3800000NTU3.8800000
2/1/20154.5564.7800000NTU4.4500000
3/1/201516.0066.1900000NTU15.9700000
4/1/20155.0546.2400000NTU4.7400000
5/1/20154.8546.5900000NTU4.3500000
6/1/20153.9566.4300000NTU3.7500000
7/1/20152.7046.1800000NTU2.7000000
8/1/20153.3045.9800000NTU3.2900000
9/1/20152.0043.6400000NTU1.9800000
10/1/20153.9043.4500000NTU3.8400000
11/1/20152.8543.1200000NTU2.7200000
1/1/20162.6562.9400000NTU2.5400000
2/1/20162.7022.8200000NTU2.5500000
3/1/20161.6522.7500000NTU1.5900000
4/1/20163.6522.7000000NTU3.2600000
5/1/20163.1022.7500000NTU2.7700000
6/1/20162.9522.7800000NTU2.7900000
7/1/20163.7522.9700000NTU3.7400000
8/1/20164.9023.3300000NTU4.8600000
9/1/20164.9033.8800000NTU4.7800000
10/1/20168.5024.6800000NTU8.5000000
11/1/20164.7324.9600000NTU4.2900000
12/1/20166.0025.4600000NTU4.8700000
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:
  • 1951
  • 1953

Chlorophyll a

Units: mg/l Year
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20121.0530.0010500mg/l0.0010500
2/1/20120.2530.0006500mg/l0.0002500
3/1/20123.1230.0014700mg/l0.0031200
4/1/20120.9330.0013400mg/l0.0009300
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
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/2012734.0010.7340000mg/l0.7340000
2/1/2012758.0010.7460000mg/l0.7580000
3/1/2012719.0010.7370000mg/l0.7190000
4/1/2012621.0010.7080000mg/l0.6210000

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/l Year
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/2012602.0030.6020000mg/l0.6020000
2/1/2012582.0030.5920000mg/l0.5820000
3/1/2012650.0030.6113300mg/l0.6500000
4/1/2012502.0030.5840000mg/l0.5020000
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
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/201214.70314.7000000percent (%)14.7000000
2/1/20129.70312.2000000percent (%)9.7000000
3/1/201284.30336.2300000percent (%)84.3000000
4/1/201248.80339.3800000percent (%)48.8000000
Target
percent (%)
Threshold
56.00 percent (%)

Oysters

Units: Year
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/200654.07154.0700000%54.0700000
1/1/200765.56165.5600000%65.5600000
1/1/200862.62162.6200000%62.6200000
1/1/200967.37167.3700000%67.3700000
1/1/201067.42167.4200000%67.4200000
1/1/201170.40170.4000000%70.4000000
1/1/201367.59167.5900000%67.5900000
1/1/201471.04171.0400000%71.0400000
1/1/201563.84163.8400000%63.8400000
1/1/201670.14170.1400000%70.1400000

Rainfall

Units: inches Year
2016
Historical
period of record
High 41.7 53.7
Mean 12.6118057373258
Low 11.33
No. of Samples 366 4,750

Five-year Trend Graph

     
1/1/20120.31290.3100000inches0.3100000
2/1/20120.62290.6200000inches0.6200000
3/1/20121.72311.7200000inches1.7200000
4/1/20122.59242.5900000inches2.5900000
5/1/20121.20311.2000000inches1.2000000
6/1/201216.373016.3700000inches16.3700000
7/1/20123.13313.1300000inches3.1300000
8/1/20125.55315.5500000inches5.5500000
9/1/20122.57302.5700000inches2.5700000
10/1/20123.90313.9000000inches3.9000000
11/1/20120.01280.0100000inches0.0100000
12/1/20121.21311.2100000inches1.2100000
1/1/20130.19310.1900000inches0.1900000
2/1/20131.07231.0700000inches1.0700000
3/1/20131.38311.3800000inches1.3800000
4/1/20133.54303.5400000inches3.5400000
5/1/20133.07313.0700000inches3.0700000
6/1/201311.733011.7300000inches11.7300000
7/1/20137.96317.9600000inches7.9600000
8/1/201311.863111.8600000inches11.8600000
9/1/201310.963010.9600000inches10.9600000
10/1/20131.26311.2600000inches1.2600000
11/1/20130.58300.5800000inches0.5800000
12/1/20130.07310.0700000inches0.0700000
1/1/20142.29312.2900000inches2.2900000
2/1/20143.09283.0900000inches3.0900000
3/1/20144.87314.8700000inches4.8700000
4/1/20141.40291.4000000inches1.4000000
5/1/20145.78315.7800000inches5.7800000
6/1/20143.18303.1800000inches3.1800000
7/1/20144.32314.3200000inches4.3200000
8/1/20141.51281.5100000inches1.5100000
9/1/20146.61256.6100000inches6.6100000
10/1/20142.09292.0900000inches2.0900000
11/1/20142.69302.6900000inches2.6900000
12/1/20140.34310.3400000inches0.3400000
1/1/20151.52311.5200000inches1.5200000
2/1/20153.29283.2900000inches3.2900000
3/1/20150.87310.8700000inches0.8700000
4/1/20151.06301.0600000inches1.0600000
5/1/20152.77312.7700000inches2.7700000
6/1/20155.62305.6200000inches5.6200000
7/1/20158.99318.9900000inches8.9900000
8/1/20155.48315.4800000inches5.4800000
9/1/20156.00306.0000000inches6.0000000
10/1/20152.70312.7000000inches2.7000000
11/1/20150.54300.5400000inches0.5400000
12/1/20151.74311.7400000inches1.7400000
1/1/20164.85314.8500000inches4.8500000
2/1/20161.63291.6300000inches1.6300000
3/1/20161.93311.9300000inches1.9300000
4/1/20160.39300.3900000inches0.3900000
5/1/20164.55314.5500000inches4.5500000
6/1/20167.00307.0000000inches7.0000000
7/1/20163.59313.5900000inches3.5900000
8/1/201611.083111.0800000inches11.0800000
9/1/20163.88303.8800000inches3.8800000
10/1/20162.48312.4800000inches2.4800000
11/1/20160.04300.0400000inches0.0400000
12/1/20160.24310.2400000inches0.2400000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/201224.88324.8800000PSS24.8800000
2/1/201215.68320.2800000PSS15.6800000
3/1/20120.52313.6900000PSS0.5200000
4/1/201219.98315.2700000PSS19.9800000

Turbidity

Units: NTU Year
2016
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20122.3032.3000000NTU2.3000000
2/1/20122.5032.4000000NTU2.5000000
3/1/20127.0033.9300000NTU7.0000000
4/1/20124.2034.0000000NTU4.2000000
Other Measures of Creek Health

Oysters

Because they are immobile and will tolerate a fairly wide salinity range, eastern oysters (Crassotrea virginica) are valuable as an indicator of the relative health of aquatic ecosystems in the tidally-influenced portions of coastal creeks. Sarasota County has established an oyster monitoring program to track the location, types, and status of oyster reefs. Data from this monitoring program is shown below. Learn more about Oysters »

Loading oyster site map...
Most Recent Sarasota County Oyster Monitoring Program Data
Icon Site ID Year Dead Live Total % Live
1 HUD2 2016 106 249 355 70

Impervious Features

Hudson 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 Hudson Bayou Basin is covered by impervious surfaces.

Loading interactive chart...

Land Use / Land Cover

Hudson 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 »

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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.