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Lower Lemon Bay Condition Report for 2017

View 2016 Report

Summary:

Because target values for chlorophyll a and nutrients have not yet been established for Lower Lemon Bay, it is not being assigned an overall score. The water quality measures used here to assess bay conditions all creeped upward in 2017, with the annual mean concentration of chlorophyll a exceeding the regulatory threshold. The mean concentration of nitrogen is high, with some individuals exceeding the threshold, but the mean is still below it. Phosphorus continues to be very low compared to the threshold, and its annual mean did not change appreciably from 2016.

Water Quality: The mean concentration of nitrogen in 2017 increased to 0.6053 mg/l, with some samples exceeding the regulatory threshold of 0.62 mg/l. The mean concentration of phosphorus in 2017 also increased, to 0.0551 mg/l, still well below the regulatory limit. The mean concentration of chlorophyll increased  to 0.0069 mg/l, pushing it above the regulatory mean of 0.0061 mg/l. The means for chlorophyll a, nitrogen and phosphorus were calculated as arithmetic means (per the Numeric Nutrient Criteria outlined in the Florida Administrative Code, section 62-302.532).

Biotic Indicator: Measurement of the biotic indicator, seagrass, was performed in 2016 by the Southwest Florida Water Management District. Between 2014 to 2016, seagrass coverage in Lemon Bay (including both the Upper and Lower segments) remained unchanged at 3,913 acres, exceeding the combined target value of 3,890 acres. Lower Lemon Bay was not surveyed separately, but has a target level of 2,880 acres.

Bay Location Map

Bays included in this report:

Water Chemistry Ratings

Total nitrogen, total phosphorus, and chlorophyll a levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a bay meets the water quality standards mandated by the Clean Water Act. The trend graphs for these indicators are shown below, along with their target and threshold values. A target value is a desirable goal to be attained, while a threshold is an undesirable level which is to be avoided. Learn More about these ratings and how they are calculated »

The Five-year Trend Graphs below illustrate the general trend of water quality parameters. They show a six-month running average, which moderates high and low values in the data.

Unavailable

Chlorophyll a

Units: mg/l Year
2017
Historical
period of record
High 0.052 0.119
Mean 0.0069 0.0061 0.00696789
Low 0.0012 0.0006
No. of Samples 21 1,025

Five-year Trend Graph

     
1/1/20123.6340.0036300mg/l
2/1/20122.9540.0032900mg/l
3/1/20129.9540.0055100mg/l
4/1/20125.9840.0056300mg/l
5/1/20126.9730.0059000mg/l
6/1/20125.1540.0057700mg/l
7/1/20124.2330.0058700mg/l
8/1/20126.7730.0065100mg/l
9/1/20124.6330.0056200mg/l
10/1/201211.0030.0064600mg/l
11/1/20123.0030.0058000mg/l
12/1/20121.3330.0051600mg/l
1/1/201326.3520.0088500mg/l
2/1/20135.5520.0086400mg/l
3/1/20132.9730.0083700mg/l
4/1/20131.7030.0068200mg/l
5/1/20135.7840.0072800mg/l
6/1/20132.7040.0075100mg/l
7/1/20139.4520.0046900mg/l
8/1/20136.9520.0049300mg/l
9/1/201310.9330.0062500mg/l
10/1/201319.5020.0092200mg/l
11/1/20137.0330.0094300mg/l
12/1/20135.9330.0099700mg/l
1/1/20142.5730.0088200mg/l
2/1/20143.5030.0082400mg/l
3/1/20143.6040.0070200mg/l
4/1/20141.9520.0041000mg/l
5/1/20145.3230.0038100mg/l
6/1/20143.5040.0034100mg/l
7/1/20144.3330.0037000mg/l
8/1/20147.9730.0044500mg/l
9/1/20143.9020.0045000mg/l
10/1/20149.3520.0057300mg/l
11/1/20142.8040.0053100mg/l
12/1/20149.8040.0063600mg/l
1/1/20153.9730.0063000mg/l
2/1/20153.4520.0055500mg/l
3/1/20154.4840.0056400mg/l
4/1/20155.7840.0050500mg/l
5/1/20154.1020.0052600mg/l
6/1/20154.5030.0043800mg/l
7/1/20154.1520.0044100mg/l
8/1/20155.3020.0047200mg/l
9/1/20155.7520.0049300mg/l
10/1/20157.2520.0051800mg/l
11/1/20154.0330.0051600mg/l
12/1/20154.9340.0052400mg/l
1/1/20164.0540.0052200mg/l
2/1/20167.7330.0056200mg/l
3/1/20162.5030.0050800mg/l
4/1/20164.8330.0046800mg/l
5/1/20168.4030.0054100mg/l
6/1/20164.3520.0053100mg/l
7/1/20166.2020.0056700mg/l
8/1/20164.3020.0051000mg/l
9/1/20163.6520.0052900mg/l
10/1/201617.0020.0073200mg/l
11/1/20165.8020.0068800mg/l
12/1/20167.5520.0074200mg/l
1/1/20171.5520.0066400mg/l
2/1/20172.1520.0062800mg/l
3/1/20171.5020.0059300mg/l
4/1/20173.0020.0035900mg/l
5/1/20174.4010.0033600mg/l
6/1/20172.8010.0025700mg/l
7/1/20173.6520.0029200mg/l
8/1/20175.5330.0034800mg/l
9/1/201734.0020.0089000mg/l
10/1/201710.5020.0101500mg/l
11/1/20173.9020.0100600mg/l
Loading Chart...
Target
mg/l
Threshold
0.0061 mg/l
Unavailable

Nitrogen, Total

Units: mg/l Year
2017
Historical
period of record
High 1.404 2.66
Mean 0.6053 0.5342 0.31443109 0.0000000000
Low 0.384 0.00
No. of Samples 21 1,047

Five-year Trend Graph

     
1/1/2012427.2540.4272500mg/l
2/1/2012417.5040.4223800mg/l
3/1/2012597.5040.4807500mg/l
4/1/2012427.5040.4674400mg/l
5/1/2012608.3330.4956200mg/l
6/1/2012514.0040.4986800mg/l
7/1/2012684.0030.5414700mg/l
8/1/2012480.6730.5520000mg/l
9/1/2012530.6730.5408600mg/l
10/1/2012630.6730.5747200mg/l
11/1/2012610.6730.5751100mg/l
12/1/2012404.0030.5567800mg/l
1/1/2013964.0020.6034500mg/l
2/1/2013556.0020.6160000mg/l
3/1/2013523.0030.6147200mg/l
4/1/2013441.3330.5831700mg/l
5/1/2013549.5040.5729700mg/l
6/1/2013399.0040.5721400mg/l
7/1/20135.5020.4123900mg/l
8/1/2013704.0020.4370600mg/l
9/1/2013714.3330.4689400mg/l
10/1/2013824.0020.5327200mg/l
11/1/2013500.6730.5245800mg/l
12/1/2013534.0030.5470800mg/l
1/1/2014440.6730.6196100mg/l
2/1/2014430.6730.5740600mg/l
3/1/2014484.0040.5356700mg/l
4/1/2014484.0020.4790000mg/l
5/1/2014475.0030.4747200mg/l
6/1/2014477.2540.4652700mg/l
7/1/2014517.3330.4780400mg/l
8/1/2014671.3330.5181500mg/l
9/1/2014514.0020.5231500mg/l
10/1/2014659.5020.5524000mg/l
11/1/2014489.7540.5548600mg/l
12/1/2014599.0040.5751500mg/l
1/1/2015454.0030.5646000mg/l
2/1/2015314.0020.5050400mg/l
3/1/2015396.5040.4854600mg/l
4/1/2015456.5040.4516300mg/l
5/1/2015394.0020.4356700mg/l
6/1/2015500.6730.4192800mg/l
7/1/2015504.0020.4276100mg/l
8/1/2015610.5020.4770300mg/l
9/1/2015670.0020.5226100mg/l
10/1/2015529.0020.5347000mg/l
11/1/2015464.0030.5463600mg/l
12/1/2015451.5040.5381700mg/l
1/1/2016485.7540.5351300mg/l
2/1/2016514.0030.5190400mg/l
3/1/2016564.0030.5013800mg/l
4/1/2016537.6730.5028200mg/l
5/1/2016627.3330.5300400mg/l
6/1/2016506.5020.5392100mg/l
7/1/2016529.0020.5464200mg/l
8/1/2016549.0020.5522500mg/l
9/1/2016732.0020.5802500mg/l
10/1/2016754.0020.6163100mg/l
11/1/2016614.0020.6140800mg/l
12/1/2016612.5020.6317500mg/l
1/1/2017395.5020.6095000mg/l
2/1/2017559.5020.6112500mg/l
3/1/2017504.0020.5732500mg/l
4/1/2017559.0020.5407500mg/l
5/1/2017734.0010.5607500mg/l
6/1/2017674.0010.5710000mg/l
7/1/2017504.0020.5890800mg/l
8/1/2017634.0030.6015000mg/l
9/1/20171119.0020.7040000mg/l
10/1/2017714.0020.7298300mg/l
11/1/2017647.5020.7154200mg/l
Loading Chart...
Target
0.00 mg/l
Threshold
0.62 mg/l
Unavailable

Phosphorus, Total

Units: mg/l Year
2017
Historical
period of record
High 0.15 1.30
Mean 0.0551 0.0642 0.10701194 0.0000000000
Low 0.03 0.002
No. of Samples 21 1,013

Five-year Trend Graph

     
1/1/201242.5040.0425000mg/l
2/1/201241.7540.0421300mg/l
3/1/201282.5040.0555800mg/l
4/1/201263.7540.0576300mg/l
5/1/201256.3330.0573700mg/l
6/1/201247.0040.0556400mg/l
7/1/201241.0020.0553900mg/l
8/1/201243.6730.0557100mg/l
9/1/201248.0030.0499600mg/l
10/1/201268.0030.0506700mg/l
11/1/201247.3330.0491700mg/l
12/1/201228.6730.0461100mg/l
1/1/2013103.0020.0564500mg/l
2/1/201352.5020.0579200mg/l
3/1/201348.6730.0580300mg/l
4/1/201333.0030.0522000mg/l
5/1/201357.0030.0538100mg/l
6/1/201334.0040.0547000mg/l
7/1/201360.5020.0476100mg/l
8/1/201360.5020.0489500mg/l
9/1/201374.3330.0532200mg/l
10/1/2013120.0020.0677200mg/l
11/1/201370.6730.0700000mg/l
12/1/201360.3330.0743900mg/l
1/1/201445.6730.0719200mg/l
2/1/201455.3330.0710600mg/l
3/1/201455.0030.0678300mg/l
4/1/201454.5020.0569200mg/l
5/1/201454.3330.0541900mg/l
6/1/201460.7540.0542600mg/l
7/1/201443.3330.0538700mg/l
8/1/201474.0030.0569900mg/l
9/1/201449.5020.0560700mg/l
10/1/201468.5020.0584000mg/l
11/1/201452.7540.0581400mg/l
12/1/201438.6730.0544600mg/l
1/1/201561.0030.0574000mg/l
2/1/201543.0020.0522400mg/l
3/1/201549.5040.0522400mg/l
4/1/201557.0040.0503200mg/l
5/1/201562.5020.0519500mg/l
6/1/201546.3330.0532200mg/l
7/1/201544.5020.0504700mg/l
8/1/201553.5020.0522200mg/l
9/1/201565.5020.0548900mg/l
10/1/201568.5020.0568100mg/l
11/1/201555.0030.0555600mg/l
12/1/201589.2540.0627100mg/l
1/1/201669.0040.0667900mg/l
2/1/201657.6730.0674900mg/l
3/1/201660.6730.0666800mg/l
4/1/201660.0030.0652700mg/l
5/1/201661.0030.0662700mg/l
6/1/201672.5020.0634700mg/l
7/1/201645.0020.0594700mg/l
8/1/201646.5020.0576100mg/l
9/1/201671.0020.0593300mg/l
10/1/201699.0020.0658300mg/l
11/1/201660.0020.0656700mg/l
12/1/201636.5020.0596700mg/l
1/1/201754.5020.0612500mg/l
2/1/201747.0020.0613300mg/l
3/1/201742.0020.0565000mg/l
4/1/201744.5020.0474200mg/l
5/1/201752.0010.0460800mg/l
6/1/201737.0010.0461700mg/l
7/1/201737.5020.0433300mg/l
8/1/201749.6730.0437800mg/l
9/1/2017115.5020.0560300mg/l
10/1/2017105.0020.0661100mg/l
11/1/201778.5020.0705300mg/l
Loading Chart...
Target
0.00 mg/l
Threshold
0.17 mg/l

Dissolved Oxygen

Units: mg/l Year
2017
Historical
period of record
High 7.20 13.60
Mean 5.34 5.93 1.61481 0.0000000000
Low 2.30 1.30
No. of Samples 19 6,414

Five-year Trend Graph

     
1/1/20126.4546.4500000mg/l
2/1/20125.1545.8000000mg/l
3/1/20127.63226.4100000mg/l
4/1/20125.66106.2200000mg/l
5/1/20124.5855.8900000mg/l
6/1/20125.1845.7800000mg/l
7/1/20125.68575.6500000mg/l
8/1/20123.7655.4200000mg/l
9/1/20123.7034.7600000mg/l
10/1/20124.3334.5400000mg/l
11/1/20127.55315.0300000mg/l
12/1/20126.0035.1700000mg/l
1/1/20134.9025.0400000mg/l
2/1/20136.8525.5600000mg/l
3/1/20138.34316.3300000mg/l
4/1/20136.5736.7000000mg/l
5/1/20134.7736.2400000mg/l
6/1/20135.0546.0800000mg/l
7/1/20134.3025.9800000mg/l
8/1/20134.8525.6500000mg/l
9/1/20134.9335.0800000mg/l
10/1/20135.0524.8300000mg/l
11/1/20135.2334.9000000mg/l
12/1/20137.7025.3400000mg/l
1/1/20146.0035.6300000mg/l
2/1/20146.3025.8700000mg/l
3/1/20146.2346.0900000mg/l
4/1/20145.5026.1600000mg/l
5/1/20145.5026.2100000mg/l
6/1/20144.2845.6400000mg/l
7/1/20143.9735.3000000mg/l
8/1/20145.1035.1000000mg/l
9/1/20145.42204.9600000mg/l
10/1/20145.9035.0300000mg/l
11/1/20146.0045.1100000mg/l
12/1/20146.3345.4500000mg/l
1/1/20155.1035.6400000mg/l
2/1/20156.7025.9100000mg/l
3/1/20156.6036.1100000mg/l
4/1/20156.8736.2700000mg/l
5/1/20156.1526.2900000mg/l
6/1/20155.9366.2300000mg/l
7/1/20153.6015.9800000mg/l
8/1/20153.8525.5000000mg/l
9/1/20156.43345.4700000mg/l
10/1/20155.84335.3000000mg/l
11/1/20155.5025.1900000mg/l
12/1/20156.49345.2900000mg/l
1/1/20168.13106.0400000mg/l
2/1/20167.0736.5800000mg/l
3/1/20168.53326.9300000mg/l
4/1/20165.9026.9400000mg/l
5/1/20164.9036.8400000mg/l
6/1/20166.06466.7700000mg/l
7/1/20163.6526.0200000mg/l
8/1/20163.4525.4200000mg/l
9/1/20164.6524.7700000mg/l
10/1/20163.9024.4400000mg/l
11/1/20164.4024.3500000mg/l
12/1/20166.4524.4200000mg/l
1/1/20174.5014.5600000mg/l
2/1/20176.1015.0000000mg/l
3/1/20175.5525.1500000mg/l
4/1/20173.7015.1200000mg/l
5/1/20174.0015.0500000mg/l
7/1/20174.6524.8000000mg/l
8/1/20174.8334.5500000mg/l
9/1/20175.2524.4900000mg/l
10/1/20176.4525.0400000mg/l
11/1/20175.6025.3600000mg/l
12/1/20176.8025.6000000mg/l
Loading Chart...
Target
0.00 mg/l
Threshold
0.00 mg/l

Apparent Color

Units: PCU Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20125.0045.0000000PCU
2/1/20126.8845.9400000PCU
3/1/20122.5544.8100000PCU
4/1/20122.5044.2300000PCU
5/1/20124.1734.2200000PCU
6/1/20122.6843.9600000PCU
7/1/20124.1733.8300000PCU
8/1/20124.2333.3800000PCU
9/1/20126.6734.0700000PCU
10/1/20127.7334.9400000PCU
11/1/20125.3335.1400000PCU
12/1/20122.5035.1100000PCU
1/1/201315.7527.0400000PCU
2/1/20135.0027.1600000PCU
3/1/20134.1736.7500000PCU
4/1/20137.5036.7100000PCU
5/1/20133.9346.4800000PCU
6/1/20133.7546.6800000PCU
7/1/201334.0029.7300000PCU
8/1/201323.50212.8100000PCU
9/1/201324.67316.2300000PCU
10/1/201338.50221.3900000PCU
11/1/20137.60322.0000000PCU
12/1/20134.17322.0700000PCU
1/1/20143.93317.0600000PCU
2/1/20147.50314.4000000PCU
3/1/20143.75410.9100000PCU
4/1/20145.0025.3300000PCU
5/1/20144.7034.8400000PCU
6/1/20144.2344.8500000PCU
7/1/20146.4735.2800000PCU
8/1/20143.7334.6500000PCU
9/1/20142.5024.4400000PCU
10/1/201421.5027.1900000PCU
11/1/20145.7047.3600000PCU
12/1/20143.9347.3100000PCU
1/1/20152.9736.7200000PCU
2/1/20158.7527.5600000PCU
3/1/20152.7047.5900000PCU
4/1/20152.5044.4300000PCU
5/1/20152.5023.8900000PCU
6/1/20153.3333.7900000PCU
7/1/20156.0024.3000000PCU
8/1/201526.1527.2000000PCU
9/1/201523.00210.5800000PCU
10/1/201512.20212.2000000PCU
11/1/20155.03312.6200000PCU
12/1/20153.25412.6100000PCU
1/1/20163.38412.1700000PCU
2/1/20169.5039.3900000PCU
3/1/20165.0736.4100000PCU
4/1/20165.8335.3400000PCU
5/1/20165.8335.4800000PCU
6/1/201614.6027.3700000PCU
7/1/20168.4028.2100000PCU
8/1/201610.5028.3700000PCU
9/1/201655.00216.6900000PCU
10/1/201615.50218.3100000PCU
11/1/20162.60217.7700000PCU
12/1/20165.00216.1700000PCU
1/1/20175.00215.6000000PCU
2/1/20172.50214.2700000PCU
3/1/20175.0025.9300000PCU
4/1/20172.5023.7700000PCU
5/1/20172.5013.7500000PCU
6/1/20174.6013.6800000PCU
7/1/20175.8023.8200000PCU
8/1/201723.3337.2900000PCU
9/1/201752.50215.2100000PCU
10/1/201725.50219.0400000PCU
11/1/20174.35219.3500000PCU
Loading Chart...

BOD, Biochemical oxygen demand

Units: mg/l Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
Loading Chart...

Dissolved oxygen saturation

Units: percent (%) Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
3/1/2012115.208115.2000000percent (%)
4/1/201295.202105.2000000percent (%)
5/1/201279.49296.6300000percent (%)
7/1/201288.082094.4900000percent (%)
8/1/201266.20288.8300000percent (%)
11/1/2012110.301288.1900000percent (%)
3/1/2013113.8310112.0700000percent (%)
Loading Chart...
Target
percent (%)
Threshold
percent (%)

Karenia brevis

Units: #/l Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
Loading Chart...

Light Attenuation

Note: Light attenuation data are unavailable for Lower Lemon Bay at this time.
Units: K(1/m) Year
2017
Historical
period of record
High
Mean 0.0000000000
Low
No. of Samples

Five-year Trend Graph

     
Loading Chart...
Target
0.00 K(1/m)
Threshold
0.00 K(1/m)

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
Loading Chart...

Nitrogen, Kjeldahl

Units: ug/l Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/2012422.504422.5000000ug/l
2/1/2012412.504417.5000000ug/l
3/1/2012592.504475.8300000ug/l
4/1/2012422.504462.5000000ug/l
5/1/2012603.333490.6700000ug/l
6/1/2012510.004493.8900000ug/l
7/1/2012615.002525.9700000ug/l
8/1/2012476.673536.6700000ug/l
9/1/2012526.673525.7000000ug/l
10/1/2012626.673559.7200000ug/l
11/1/2012606.673560.2800000ug/l
12/1/2012396.673541.3900000ug/l
1/1/2013960.002598.8900000ug/l
2/1/2013550.002611.1100000ug/l
3/1/2013516.673609.4500000ug/l
4/1/2013436.673577.7800000ug/l
5/1/2013503.333560.5600000ug/l
6/1/2013395.004560.2800000ug/l
7/1/2013735.002522.7800000ug/l
8/1/2013700.002547.7800000ug/l
9/1/2013710.003580.0000000ug/l
10/1/2013820.002643.8900000ug/l
11/1/2013496.673642.7800000ug/l
12/1/2013530.003665.2800000ug/l
1/1/2014436.673615.5600000ug/l
2/1/2014426.673570.0000000ug/l
3/1/2014496.673534.4500000ug/l
4/1/2014480.002477.7800000ug/l
5/1/2014470.003473.3400000ug/l
6/1/2014470.004463.3400000ug/l
7/1/2014513.333476.1100000ug/l
8/1/2014666.673516.1100000ug/l
9/1/2014510.002518.3300000ug/l
10/1/2014655.002547.5000000ug/l
11/1/2014485.004550.0000000ug/l
12/1/2014360.003531.6700000ug/l
1/1/2015450.003521.1100000ug/l
2/1/2015310.002461.6700000ug/l
3/1/2015392.504442.0800000ug/l
4/1/2015452.504408.3300000ug/l
5/1/2015390.002392.5000000ug/l
6/1/2015496.673415.2800000ug/l
7/1/2015500.002423.6100000ug/l
8/1/2015605.002472.7800000ug/l
9/1/2015665.002518.2000000ug/l
10/1/2015525.002530.2800000ug/l
11/1/2015460.003541.9500000ug/l
12/1/2015447.504533.7500000ug/l
1/1/2016480.004530.4200000ug/l
2/1/2016510.003514.5800000ug/l
3/1/2016560.003497.0800000ug/l
4/1/2016533.333498.4700000ug/l
5/1/2016623.333525.6900000ug/l
6/1/2016490.002532.7800000ug/l
7/1/2016525.002540.2800000ug/l
8/1/2016545.002546.1100000ug/l
9/1/2016725.002573.6100000ug/l
10/1/2016750.002609.7200000ug/l
11/1/2016610.002607.5000000ug/l
12/1/2016610.002627.5000000ug/l
1/1/2017390.002605.0000000ug/l
2/1/2017555.002606.6700000ug/l
3/1/2017500.002569.1700000ug/l
4/1/2017555.002536.6700000ug/l
5/1/2017730.001556.6700000ug/l
6/1/2017670.001566.6700000ug/l
7/1/2017500.002585.0000000ug/l
8/1/2017630.003597.5000000ug/l
9/1/20171115.002700.0000000ug/l
10/1/2017710.002725.8300000ug/l
11/1/2017640.002710.8300000ug/l
Loading Chart...

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20124.7544.7500000ug/l
2/1/20125.0044.8800000ug/l
3/1/20125.0044.9200000ug/l
4/1/20125.0044.9400000ug/l
5/1/20125.0034.9500000ug/l
6/1/20124.0044.7900000ug/l
7/1/20124.0024.6700000ug/l
8/1/20124.0034.5000000ug/l
9/1/20124.0034.3300000ug/l
10/1/20124.0034.1700000ug/l
11/1/20124.0034.0000000ug/l
12/1/20127.3334.5600000ug/l
1/1/20134.0024.5600000ug/l
2/1/20136.0024.8900000ug/l
3/1/20136.3335.2800000ug/l
4/1/20134.6735.3900000ug/l
5/1/20134.6735.5000000ug/l
6/1/20134.0044.9500000ug/l
7/1/20135.5025.2000000ug/l
8/1/20134.0024.8600000ug/l
9/1/20134.3334.5300000ug/l
10/1/20134.0024.4200000ug/l
11/1/20134.0034.3100000ug/l
12/1/20134.0034.3100000ug/l
1/1/20144.0034.0600000ug/l
2/1/20144.0034.0600000ug/l
3/1/20144.0034.0000000ug/l
4/1/20144.0024.0000000ug/l
5/1/20145.0034.1700000ug/l
6/1/20147.2544.7100000ug/l
7/1/20144.0034.7100000ug/l
8/1/20144.6734.8200000ug/l
9/1/20144.0024.8200000ug/l
10/1/20144.5024.9000000ug/l
11/1/20144.7544.8600000ug/l
12/1/20144.0034.3200000ug/l
1/1/20154.0034.3200000ug/l
2/1/20154.0024.2100000ug/l
3/1/20154.0044.2100000ug/l
4/1/20154.0044.1300000ug/l
5/1/20154.0024.0000000ug/l
6/1/20154.0034.0000000ug/l
7/1/20154.0024.0000000ug/l
8/1/20155.5024.2500000ug/l
9/1/20155.0024.4200000ug/l
10/1/20154.0024.4200000ug/l
11/1/20154.0034.4200000ug/l
12/1/20154.0044.4200000ug/l
1/1/20165.7544.7100000ug/l
2/1/20164.0034.4600000ug/l
3/1/20164.0034.2900000ug/l
4/1/20164.3334.3500000ug/l
5/1/20164.0034.3500000ug/l
6/1/201616.5026.4300000ug/l
7/1/20164.0026.1400000ug/l
8/1/20164.0026.1400000ug/l
9/1/20167.0026.6400000ug/l
10/1/20164.0026.5800000ug/l
11/1/20164.0026.5800000ug/l
12/1/20164.5024.5800000ug/l
1/1/20175.5024.8300000ug/l
2/1/20174.5024.9200000ug/l
3/1/20174.0024.4200000ug/l
4/1/20174.0024.4200000ug/l
5/1/20174.0014.4200000ug/l
6/1/20174.0014.3300000ug/l
7/1/20174.0024.0800000ug/l
8/1/20174.0034.0000000ug/l
9/1/20174.0024.0000000ug/l
10/1/20174.0024.0000000ug/l
11/1/20177.5024.5800000ug/l
Loading Chart...

pH

Units: None Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/20128.0448.0400000None
2/1/20128.1048.0700000None
3/1/20128.22138.1200000None
4/1/20128.1878.1400000None
5/1/20127.8148.0700000None
6/1/20128.1448.0800000None
7/1/20127.70508.0300000None
8/1/20128.0628.0200000None
9/1/20127.7837.9500000None
10/1/20127.5527.8400000None
11/1/20126.42317.6100000None
12/1/20127.8437.5600000None
1/1/20137.3127.4900000None
2/1/20137.5727.4100000None
3/1/20137.74167.4100000None
4/1/20138.0027.4800000None
5/1/20137.9347.7300000None
6/1/20138.0047.7600000None
7/1/20137.14177.7300000None
8/1/20138.1927.8300000None
9/1/20138.09147.8900000None
10/1/20137.9427.8800000None
11/1/20138.2037.9300000None
12/1/20138.1437.9500000None
1/1/20147.1937.9600000None
2/1/20147.5527.8500000None
3/1/20148.1357.8600000None
4/1/20148.1227.8900000None
5/1/20148.0637.8700000None
6/1/20148.0847.8600000None
7/1/20148.0748.0000000None
8/1/20148.0338.0800000None
9/1/20148.23118.1000000None
10/1/20147.7338.0300000None
11/1/20148.0848.0400000None
12/1/20148.0248.0300000None
1/1/20157.9438.0100000None
2/1/20157.9828.0000000None
3/1/20158.1147.9800000None
4/1/20158.2048.0600000None
5/1/20158.1128.0600000None
6/1/20158.1558.0800000None
7/1/20158.1328.1100000None
8/1/20157.9228.1000000None
9/1/20158.0328.0900000None
10/1/20157.91198.0400000None
11/1/20158.0638.0300000None
12/1/20157.96198.0000000None
1/1/20168.0377.9900000None
2/1/20168.0438.0100000None
3/1/20168.05168.0100000None
4/1/20168.0638.0300000None
5/1/20168.1338.0500000None
6/1/20168.20248.0900000None
7/1/20168.27208.1300000None
8/1/20168.31218.1700000None
9/1/20168.33188.2200000None
10/1/20168.3438.2600000None
11/1/20168.35398.3000000None
12/1/20168.40208.3300000None
1/1/20178.1648.3200000None
2/1/20178.1928.3000000None
3/1/20178.1528.2700000None
4/1/20178.0728.2200000None
5/1/20177.9918.1600000None
7/1/20178.1128.1000000None
8/1/20177.7338.0100000None
9/1/20177.9927.9800000None
10/1/20177.8627.9400000None
11/1/20178.2127.9800000None
12/1/20177.7337.9400000None
Loading Chart...

Rainfall

Units: inches/yr Year
2017
Historical
period of record
High 63.54 68.86
Mean 39.93 20.3494979463049
Low 9.27
No. of Samples 359 5,296

Five-year Trend Graph

     
1/1/20130.22300.2200000inches
2/1/20131.62231.6200000inches
3/1/20131.97281.9700000inches
4/1/20134.21294.2100000inches
5/1/20135.12315.1200000inches
6/1/201312.143012.1400000inches
7/1/201319.403119.4000000inches
8/1/201310.973110.9700000inches
9/1/20139.25309.2500000inches
10/1/20131.34311.3400000inches
11/1/20130.37300.3700000inches
12/1/20130.24310.2400000inches
1/1/20143.74293.7400000inches
2/1/20141.48271.4800000inches
3/1/20144.81314.8100000inches
4/1/20142.47292.4700000inches
5/1/20144.05314.0500000inches
6/1/20144.77304.7700000inches
7/1/20143.18313.1800000inches
8/1/20147.54287.5400000inches
9/1/20149.58269.5800000inches
10/1/20141.46291.4600000inches
11/1/20143.98303.9800000inches
12/1/20140.05310.0500000inches
1/1/20152.07312.0700000inches
2/1/20152.85282.8500000inches
3/1/20151.21311.2100000inches
4/1/20151.31301.3100000inches
5/1/20154.67314.6700000inches
6/1/20153.07303.0700000inches
7/1/20158.65318.6500000inches
8/1/20156.19316.1900000inches
9/1/20155.56305.5600000inches
10/1/20153.96313.9600000inches
11/1/20150.89300.8900000inches
12/1/20151.39311.3900000inches
1/1/20168.75318.7500000inches
2/1/20163.90293.9000000inches
3/1/20162.14312.1400000inches
4/1/20160.78300.7800000inches
5/1/20163.69313.6900000inches
6/1/20166.17306.1700000inches
7/1/20167.69317.6900000inches
8/1/201612.133112.1300000inches
9/1/20165.27305.2700000inches
10/1/20166.20316.2000000inches
11/1/20160.18300.1800000inches
12/1/20160.10310.1000000inches
1/1/20171.26311.2600000inches
2/1/20172.42282.4200000inches
3/1/20172.02312.0200000inches
4/1/20170.29300.2900000inches
5/1/20179.09319.0900000inches
6/1/201713.583113.5800000inches
7/1/201710.913110.9100000inches
8/1/201711.983111.9800000inches
9/1/20174.25234.2500000inches
10/1/20175.62315.6200000inches
11/1/20170.87300.8700000inches
12/1/20171.25311.2500000inches
Loading Chart...
Target
inches/yr
Threshold
inches/yr

Salinity

Units: PSS Year
2017
Historical
period of record
High 37.10 63.10
Mean 31.49 33.32 3.159
Low 17.10 3.70
No. of Samples 24 7,369

Five-year Trend Graph

     
1/1/201234.78434.7800000PSS
2/1/201234.03434.4100000PSS
3/1/201235.482234.7600000PSS
4/1/201236.371035.1700000PSS
5/1/201236.56535.4400000PSS
6/1/201236.70435.6500000PSS
7/1/201234.559735.6200000PSS
8/1/201234.00535.6100000PSS
9/1/201235.57335.6300000PSS
10/1/201231.97334.8900000PSS
11/1/201234.965934.6300000PSS
12/1/201233.80334.1400000PSS
1/1/201334.37234.1100000PSS
2/1/201335.35234.3400000PSS
3/1/201335.583134.3400000PSS
4/1/201334.50334.7600000PSS
5/1/201334.55434.6900000PSS
6/1/201336.63435.1600000PSS
7/1/201329.733234.3900000PSS
8/1/201330.25233.5400000PSS
9/1/201328.87332.4200000PSS
10/1/201326.75231.1300000PSS
11/1/201333.73330.9900000PSS
12/1/201330.35229.9500000PSS
1/1/201434.63330.7600000PSS
2/1/201430.83330.8600000PSS
3/1/201433.88631.7000000PSS
4/1/201429.70232.1900000PSS
5/1/201434.07332.2400000PSS
6/1/201436.05433.1900000PSS
7/1/201436.52533.5100000PSS
8/1/201434.20334.0700000PSS
9/1/201432.122033.7800000PSS
10/1/201429.17333.6900000PSS
11/1/201432.15433.3700000PSS
12/1/201433.13432.8800000PSS
1/1/201534.67332.5700000PSS
2/1/201533.90232.5200000PSS
3/1/201533.05432.6800000PSS
4/1/201535.23433.6900000PSS
5/1/201534.55234.0900000PSS
6/1/201534.27734.2800000PSS
7/1/201536.80234.6300000PSS
8/1/201531.75234.2800000PSS
9/1/201530.383433.8300000PSS
10/1/201532.223433.3300000PSS
11/1/201532.63333.0100000PSS
12/1/201534.323433.0200000PSS
1/1/201634.351032.6100000PSS
2/1/201629.63332.2600000PSS
3/1/201632.793332.6600000PSS
4/1/201633.20332.8200000PSS
5/1/201635.67333.3300000PSS
6/1/201637.294633.8200000PSS
7/1/201634.35233.8200000PSS
8/1/201633.60234.4800000PSS
9/1/201626.20233.3900000PSS
10/1/201630.30232.9000000PSS
11/1/201634.15232.6500000PSS
12/1/201634.55232.1900000PSS
1/1/201735.20232.3300000PSS
2/1/201734.70232.5200000PSS
3/1/201733.30233.7000000PSS
4/1/201735.60234.5800000PSS
5/1/201734.60134.6600000PSS
6/1/201737.10135.0800000PSS
7/1/201733.45234.7900000PSS
8/1/201725.97333.3400000PSS
9/1/201720.50231.2000000PSS
10/1/201728.70230.0500000PSS
11/1/201730.90229.4400000PSS
12/1/201733.83328.8900000PSS
Loading Chart...

Specific conductance

Units: umho Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
Loading Chart...

Temperature, water

Units: deg F Year
2017
Historical
period of record
High
Mean
Low
No. of Samples

Five-year Trend Graph

     
1/1/201263.55463.5500000deg F
2/1/201270.48467.0200000deg F
3/1/201274.822269.6200000deg F
4/1/201278.481071.8300000deg F
5/1/201281.36573.7400000deg F
6/1/201283.08475.3000000deg F
7/1/201285.849779.0100000deg F
8/1/201286.36581.6600000deg F
9/1/201284.32383.2400000deg F
10/1/201283.84384.1300000deg F
11/1/201271.335982.4600000deg F
12/1/201268.78380.0800000deg F
1/1/201371.24277.6500000deg F
2/1/201361.16273.4500000deg F
3/1/201366.503170.4800000deg F
4/1/201369.50368.0900000deg F
5/1/201374.57468.6300000deg F
6/1/201384.16471.1900000deg F
7/1/201385.303273.5300000deg F
8/1/201387.44277.9100000deg F
9/1/201384.391380.8900000deg F
10/1/201382.85283.1200000deg F
11/1/201371.66382.6300000deg F
12/1/201367.40379.8400000deg F
1/1/201467.28376.8400000deg F
2/1/201466.74373.3900000deg F
3/1/201468.51670.7400000deg F
4/1/201476.91269.7500000deg F
5/1/201475.62370.4100000deg F
6/1/201481.95472.8400000deg F
7/1/201487.44576.2000000deg F
8/1/201486.72379.5300000deg F
9/1/201485.332082.3300000deg F
10/1/201475.26382.0500000deg F
11/1/201464.04480.1200000deg F
12/1/201464.31477.1800000deg F
1/1/201573.40374.8400000deg F
2/1/201564.76271.1800000deg F
3/1/201569.53468.5500000deg F
4/1/201576.28368.7200000deg F
5/1/201582.94271.8700000deg F
6/1/201586.36775.5500000deg F
7/1/201585.01277.4800000deg F
8/1/201582.04280.3600000deg F
9/1/201588.393483.5000000deg F
10/1/201583.363484.6800000deg F
11/1/201581.26384.4000000deg F
12/1/201574.233482.3800000deg F
1/1/201664.981079.0400000deg F
2/1/201664.16376.0600000deg F
3/1/201669.243272.8700000deg F
4/1/201674.54371.4000000deg F
5/1/201681.92371.5100000deg F
6/1/201687.254673.6800000deg F
7/1/201689.183877.7200000deg F
8/1/201686.204081.3900000deg F
9/1/201688.403284.5800000deg F
10/1/201681.77485.7900000deg F
11/1/201674.017584.4700000deg F
12/1/201673.213782.1300000deg F
1/1/201766.23678.3000000deg F
2/1/201766.56275.0300000deg F
3/1/201766.38271.3600000deg F
4/1/201778.44270.8100000deg F
5/1/201778.98171.6300000deg F
6/1/201784.20173.4700000deg F
7/1/201787.44277.0000000deg F
8/1/201786.96380.4000000deg F
9/1/201785.37283.5700000deg F
10/1/201783.39284.3900000deg F
11/1/201774.30283.6100000deg F
12/1/201771.48381.4900000deg F
Loading Chart...

Turbidity

Units: NTU Year
2017
Historical
period of record
High 4.30 40.00
Mean 2.3 3.27 2.49413
Low 1.00 0.15
No. of Samples 21 5,141

Five-year Trend Graph

     
1/1/20123.8043.8000000NTU
2/1/20124.4044.1000000NTU
3/1/20124.49144.2300000NTU
4/1/20125.3074.5000000NTU
5/1/20128.1735.2300000NTU
6/1/20125.1345.2200000NTU
7/1/20124.0735.2600000NTU
8/1/20123.4035.0900000NTU
9/1/20123.4334.9200000NTU
10/1/20124.2334.7400000NTU
11/1/20122.2733.7600000NTU
12/1/20121.2833.1100000NTU
1/1/20133.7023.0500000NTU
2/1/20133.2023.0200000NTU
3/1/20133.7333.0700000NTU
4/1/20131.7332.6500000NTU
5/1/20135.0543.1200000NTU
6/1/20131.9543.2300000NTU
7/1/20132.1022.9600000NTU
8/1/20132.1522.7900000NTU
9/1/20132.2732.5400000NTU
10/1/20134.0022.9200000NTU
11/1/20132.7732.5400000NTU
12/1/20132.9732.7100000NTU
1/1/20142.2332.7300000NTU
2/1/20143.5032.9600000NTU
3/1/20144.1043.2600000NTU
4/1/20143.4023.1600000NTU
5/1/20144.5733.4600000NTU
6/1/20143.1343.4900000NTU
7/1/20143.1333.6400000NTU
8/1/20143.2033.5900000NTU
9/1/20142.6523.3500000NTU
10/1/20142.7023.2300000NTU
11/1/20142.8342.9400000NTU
12/1/20142.2342.7900000NTU
1/1/20152.4032.6700000NTU
2/1/20152.9022.6200000NTU
3/1/20153.8042.8100000NTU
4/1/20154.9343.1800000NTU
5/1/20154.7023.4900000NTU
6/1/20152.7333.5800000NTU
7/1/20153.5023.7600000NTU
8/1/20153.1523.8000000NTU
9/1/20152.2523.5400000NTU
10/1/20152.9523.2100000NTU
11/1/20152.5732.8600000NTU
12/1/20152.3042.7900000NTU
1/1/20162.8342.6800000NTU
2/1/20163.9732.8100000NTU
3/1/20164.6333.2100000NTU
4/1/20164.6733.5000000NTU
5/1/20164.7733.8600000NTU
6/1/20162.8023.9500000NTU
7/1/20162.6523.9200000NTU
8/1/20162.3523.6500000NTU
9/1/20161.7023.1600000NTU
10/1/20163.2022.9100000NTU
11/1/20164.3522.8400000NTU
12/1/20162.0522.7200000NTU
1/1/20172.2022.6400000NTU
2/1/20171.7022.5300000NTU
3/1/20171.6522.5300000NTU
4/1/20171.7022.2800000NTU
5/1/20172.1011.9000000NTU
6/1/20172.0011.8900000NTU
7/1/20172.0521.8700000NTU
8/1/20172.4031.9800000NTU
9/1/20173.5522.3000000NTU
10/1/20173.0522.5300000NTU
11/1/20172.5522.6000000NTU
Loading Chart...

Other Measures of Bay Health

In addition to nutrient levels and chlorophyll concentration, dissolved oxygen levels, and water clarity are also objective indicators of bay health. These have complex interactive cycles which are affected by rainfall, temperature, and tidal action, as well as other factors. High nutrient levels (nitrogen and phosphorus) can stimulate excessive growth of marine algae (indicated by chlorophyll a level), resulting in reduced water clarity (and increased light attenuation) and depleted oxygen levels. Both plants and animals in a bay need oxygen to survive, and the seagrasses which provide food and cover for bay creatures need light for photosynthesis.

Bay Contour Maps (2017)

Contour mapping is one of the best ways to visualize spatial differences in coastal water quality. The interactive map shown below presents monthly data for one selected water quality indicator atop an aerial view of the bay. Choose a different water quality parameter from the list at the top to change the map. Learn More about Water Quality Contour Mapping »

Loading interactive contour map viewer...
Contour Visibility:

Visit the Water Quality Contour Mapping Tool to view and compare monthly water quality contour maps for ten different water quality indicators. In addition, you can generate your own custom maps.

Contour Legend:

  • Less than 1 mg/l
  • 1.0 - 5.9 mg/l
  • 6.0 - 10.9 mg/l
  • 11.0 - 17.9 mg/l
  • Greater than 18 mg/l

Seagrasses

Among the most important habitats in Florida's estuarine environments, seagrass beds are indispensable for the role they play in cycling nutrients, supplying food for wildlife, stabilizing sediments, and providing habitat for juvenile and adult finfish and shellfish. Use the interactive map below to observe the size, density and location of seagrass beds from year to year. The graph shows how the total amount of seagrass in the bay has changed over time. Learn More about Seagrasses »

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Target
2,880 acres

Land Use / Land Cover

Land use within a bay'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 (upland or wetland, e.g.), 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 »

Lower Lemon Bay is located within the Lemon Bay Watershed. The chart below shows the land use / land cover characteristics for Lemon Bay Watershed within the boundary of this Water Atlas. View details about the Lemon Bay Watershed »

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