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Lower Lemon Bay Condition Report for 2015

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Summary:

Because no target values for chlorophyll a and nutrients have yet been established for Lower Lemon Bay, it is not being assigned an overall score. In 2015, the concentration of total nitrogen decreased slightly, again remaining below the regulatory threshold of 0.620 mg/l. While total phosphorus concentration increased slightly in 2015, it was still barely a third of the regulatory threshold of 0.170 mg/l.

Water Quality: 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). The mean concentration of total nitrogen in 2015 was 0.4603 mg/l. The mean concentration of total phosphorus in 2015 was 0.0529 mg/l.

Biotic Indicator: Measurement of the biotic indicator, seagrass, was performed in 2014 by the Southwest Florida Water Management District. Between 2012 to 2014, seagrass coverage in Lemon Bay (including both the Upper and Lower segments) increased from 3,727 to 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
2015
Historical
period of record
High 0.01 0.119
Mean 0.0048 0.0061 0.00692666
Low 0.0024 0.0006
No. of Samples 33 974

Five-year Trend Graph

     
1/1/20112.2330.0022300mg/l
2/1/20115.9340.0040800mg/l
3/1/20116.6840.0049500mg/l
4/1/20114.6040.0048600mg/l
5/1/20116.6540.0052200mg/l
6/1/20113.6540.0049600mg/l
7/1/20113.6340.0051900mg/l
8/1/20115.6040.0051400mg/l
9/1/20117.6730.0053000mg/l
10/1/20115.0730.0053800mg/l
11/1/20113.1540.0048000mg/l
12/1/20112.8540.0046600mg/l
1/1/20123.6340.0046600mg/l
2/1/20122.9540.0042200mg/l
3/1/20129.9540.0046000mg/l
4/1/20125.9840.0047500mg/l
5/1/20126.9730.0053900mg/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
Loading Chart...
Target
mg/l
Threshold
0.0061 mg/l
Unavailable

Nitrogen, Total

Units: mg/l Year
2015
Historical
period of record
High 0.674 2.66
Mean 0.4584 0.32032786 0.0000000000
Low 0.274 0.00
No. of Samples 33 996

Five-year Trend Graph

     
1/1/2011390.6730.3906700mg/l
2/1/2011532.5040.4615900mg/l
3/1/2011532.5040.4852200mg/l
4/1/2011455.0040.4776700mg/l
5/1/2011552.5040.4926300mg/l
6/1/2011487.5040.4917800mg/l
7/1/2011470.5040.5050800mg/l
8/1/2011372.5040.4784200mg/l
9/1/2011628.3330.4943900mg/l
10/1/2011478.3330.4982800mg/l
11/1/2011437.5040.4791100mg/l
12/1/2011427.5040.4691100mg/l
1/1/2012427.2540.4619000mg/l
2/1/2012417.5040.4694000mg/l
3/1/2012597.5040.4642600mg/l
4/1/2012427.5040.4557900mg/l
5/1/2012608.3330.4842600mg/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
Loading Chart...
Target
0.00 mg/l
Threshold
0.62 mg/l
Unavailable

Phosphorus, Total

Units: mg/l Year
2015
Historical
period of record
High 0.19 1.30
Mean 0.0551 0.10950464 0.0000000000
Low 0.029 0.006
No. of Samples 33 962

Five-year Trend Graph

     
1/1/201136.6730.0366700mg/l
2/1/201157.0040.0468400mg/l
3/1/201166.0040.0532200mg/l
4/1/201198.5040.0645400mg/l
5/1/201160.7540.0637800mg/l
6/1/201139.0040.0596500mg/l
7/1/201133.7540.0591700mg/l
8/1/201142.0040.0566700mg/l
9/1/201162.0030.0560000mg/l
10/1/201138.0030.0459200mg/l
11/1/201166.0040.0467900mg/l
12/1/201156.0040.0496300mg/l
1/1/201242.5040.0510800mg/l
2/1/201241.7540.0510400mg/l
3/1/201282.5040.0544600mg/l
4/1/201263.7540.0587500mg/l
5/1/201256.3330.0571400mg/l
6/1/201247.0040.0556400mg/l
7/1/201245.3330.0561100mg/l
8/1/201243.6730.0564300mg/l
9/1/201248.0030.0506800mg/l
10/1/201268.0030.0513900mg/l
11/1/201247.3330.0498900mg/l
12/1/201228.6730.0468300mg/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
5/1/201354.0040.0533100mg/l
6/1/201334.0040.0542000mg/l
7/1/201360.5020.0471100mg/l
8/1/201360.5020.0484500mg/l
9/1/201374.3330.0527200mg/l
10/1/2013120.0020.0672200mg/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
3/1/201452.7540.0674600mg/l
4/1/201454.5020.0565400mg/l
5/1/201454.3330.0538200mg/l
6/1/201460.7540.0538900mg/l
7/1/201443.3330.0535000mg/l
8/1/201474.0030.0566100mg/l
9/1/201449.5020.0560700mg/l
10/1/201468.5020.0584000mg/l
11/1/201452.7540.0581400mg/l
12/1/201459.0040.0578500mg/l
1/1/201561.0030.0607900mg/l
2/1/201543.0020.0556300mg/l
3/1/201549.5040.0556300mg/l
4/1/201557.0040.0537100mg/l
5/1/201562.5020.0553300mg/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
Loading Chart...
Target
0.00 mg/l
Threshold
0.17 mg/l

Dissolved Oxygen

Units: mg/l Year
2015
Historical
period of record
High 7.60 13.60
Mean 5.52 5.91 1.6164 0.0000000000
Low 3.60 1.30
No. of Samples 28 6,172

Five-year Trend Graph

     
1/1/20115.1255.1200000mg/l
2/1/20114.01384.5700000mg/l
3/1/20114.30404.4800000mg/l
4/1/20113.94264.3400000mg/l
5/1/20114.37324.3500000mg/l
6/1/20115.5844.5500000mg/l
7/1/20113.79834.3300000mg/l
8/1/20115.36324.5600000mg/l
9/1/20114.271154.5500000mg/l
10/1/20114.4734.6400000mg/l
11/1/20114.40644.6500000mg/l
12/1/20116.1344.7400000mg/l
1/1/20126.4545.1800000mg/l
2/1/20125.1545.1500000mg/l
3/1/20127.63225.7100000mg/l
4/1/20125.66105.9000000mg/l
5/1/20124.5855.9300000mg/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
9/1/20144.0524.7300000mg/l
10/1/20145.9034.8000000mg/l
11/1/20146.0044.8800000mg/l
12/1/20146.3345.2300000mg/l
1/1/20155.1035.4100000mg/l
2/1/20156.7025.6800000mg/l
3/1/20156.6036.1100000mg/l
4/1/20156.8736.2700000mg/l
5/1/20156.1526.2900000mg/l
6/1/20154.8026.0400000mg/l
7/1/20153.6015.7900000mg/l
8/1/20153.8525.3100000mg/l
9/1/20154.0524.8900000mg/l
10/1/20155.0524.5800000mg/l
11/1/20155.5024.4800000mg/l
12/1/20155.7544.6300000mg/l
Loading Chart...
Target
0.00 mg/l
Threshold
0.00 mg/l

Light Attenuation

Note: Light attenuation data are unavailable for Lower Lemon Bay at this time.
Units: K(1/m) Year
2015
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)

Rainfall

Units: inches/yr Year
2015
Historical
period of record
High 41.82 66.85
Mean 38.3 17.1882379282148
Low 9.42
No. of Samples 365 4,688

Five-year Trend Graph

     
1/1/20113.26313.2600000inches
2/1/20110.20280.2000000inches
3/1/20114.67314.6700000inches
4/1/20110.60270.6000000inches
5/1/20111.95311.9500000inches
6/1/20112.26272.2600000inches
7/1/201111.162911.1600000inches
8/1/20113.86173.8600000inches
9/1/20112.05222.0500000inches
10/1/20113.21253.2100000inches
11/1/20110.42260.4200000inches
12/1/20110.10280.1000000inches
1/1/20120.86260.8600000inches
2/1/20121.16271.1600000inches
3/1/20120.42230.4200000inches
4/1/20122.38212.3800000inches
5/1/20120.59290.5900000inches
6/1/201210.102810.1000000inches
7/1/20125.27315.2700000inches
8/1/20125.87315.8700000inches
9/1/20128.22308.2200000inches
10/1/20122.85282.8500000inches
11/1/20120.06270.0600000inches
12/1/20123.11313.1100000inches
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
Loading Chart...
Target
inches/yr
Threshold
inches/yr

Salinity

Units: PSS Year
2015
Historical
period of record
High 37.50 63.10
Mean 33.88 33.33 3.15652
Low 28.60 3.70
No. of Samples 33 7,085

Five-year Trend Graph

     
1/1/201132.34532.3400000PSS
2/1/201131.873832.1100000PSS
3/1/201132.634032.2800000PSS
4/1/201133.582632.6100000PSS
5/1/201133.813232.8500000PSS
6/1/201137.38433.6000000PSS
7/1/201132.938433.7000000PSS
8/1/201133.463233.9700000PSS
9/1/201133.5711334.1200000PSS
10/1/201135.60334.4600000PSS
11/1/201132.456434.2300000PSS
12/1/201134.30433.7200000PSS
1/1/201234.78434.0300000PSS
2/1/201234.03434.1200000PSS
3/1/201235.482234.4400000PSS
4/1/201236.371034.5700000PSS
5/1/201236.56535.2500000PSS
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
7/1/201326.85233.9100000PSS
8/1/201330.25233.0600000PSS
9/1/201328.87331.9400000PSS
10/1/201326.75230.6500000PSS
11/1/201333.73330.5100000PSS
12/1/201330.35229.4700000PSS
1/1/201434.63330.7600000PSS
2/1/201430.83330.8600000PSS
3/1/201433.78431.6800000PSS
4/1/201429.70232.1700000PSS
5/1/201434.07332.2300000PSS
6/1/201436.05433.1800000PSS
7/1/201436.47333.4800000PSS
8/1/201434.20334.0500000PSS
9/1/201433.95234.0700000PSS
10/1/201429.17333.9900000PSS
11/1/201432.15433.6700000PSS
12/1/201433.13433.1800000PSS
1/1/201534.67332.8800000PSS
2/1/201533.90232.8300000PSS
3/1/201533.05432.6800000PSS
4/1/201535.23433.6900000PSS
5/1/201534.55234.0900000PSS
6/1/201536.60334.6700000PSS
7/1/201536.80235.0200000PSS
8/1/201531.75234.6600000PSS
9/1/201529.50234.0700000PSS
10/1/201529.80233.1700000PSS
11/1/201532.63332.8500000PSS
12/1/201535.15432.6100000PSS
Loading Chart...

Turbidity

Units: NTU Year
2015
Historical
period of record
High 6.80 40.00
Mean 3.22 3.28 2.53506
Low 1.60 0.15
No. of Samples 33 5,092

Five-year Trend Graph

     
1/1/20113.4843.4800000NTU
2/1/20113.79213.6400000NTU
3/1/20114.15223.8100000NTU
4/1/20114.19153.9000000NTU
5/1/20114.23183.9700000NTU
6/1/20113.9343.9600000NTU
7/1/20111.84433.6900000NTU
8/1/20112.01193.3900000NTU
9/1/20112.41583.1000000NTU
10/1/20113.2032.9400000NTU
11/1/20112.81342.7000000NTU
12/1/20112.51152.4600000NTU
1/1/20123.8042.7900000NTU
2/1/20124.4043.1900000NTU
3/1/20124.49143.5400000NTU
4/1/20125.3073.8900000NTU
5/1/20128.1734.7800000NTU
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
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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 (2015)

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 »

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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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