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Matheny Creek Condition Report for 2015

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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: 1,724 acres
  • Location: Central Sarasota County
  • Discharges into: Little Sarasota Bay

Drainage from the Matheny Creek Basin is provided by two major man-made canals referenced herein as the Matheny Creek Main, which extends easterly from U.S. 41 to the headwaters of the basin and the Denham Acres Lateral which extends north from U.S. Highway 41 to Clark Road. Two water level control structures (MC-1 and MC-2) are located in the Matheny Creek Main and one water level control structure (DL-1) is located in the Denham Acres Lateral. A network of other laterals, branches and feeder ditches in the basin conduct stormwater into these two primary drainage systems. These other man-made ditches are the Breakwater Lateral, the Coral Lakes Branch, the Gulf Gate Branch, the Williamsburg Branch and the Shadow Lakes Feeder. For basin details see: Matheny Creek Basin Master Plan (1994)

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:
  • 1975B
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 0.0088 0.10
Mean 0.0035 0.0031 0.009623
Low 0.001 0.0008
No. of Samples 13 242

Five-year Trend Graph

      
1/1/20112.9930.0029900mg/l0.0029900
2/1/20113.6730.0033300mg/l0.0036700
3/1/20111.1130.0025900mg/l0.0011100
4/1/20112.9530.0026800mg/l0.0029500
5/1/20111.0830.0023600mg/l0.0010800
6/1/201121.0030.0054700mg/l0.0210000
7/1/20117.3430.0061900mg/l0.0073400
8/1/20114.0930.0062600mg/l0.0040900
9/1/20111.4730.0063200mg/l0.0014700
10/1/20114.5730.0065900mg/l0.0045700
11/1/20111.9330.0067300mg/l0.0019300
12/1/20114.1630.0039300mg/l0.0041600
1/1/20122.7030.0031500mg/l0.0027000
2/1/20122.3230.0028600mg/l0.0023200
3/1/201217.8030.0055800mg/l0.0178000
4/1/201210.8030.0066200mg/l0.0108000
5/1/201210.4030.0080300mg/l0.0104000
6/1/20128.3030.0087200mg/l0.0083000
7/1/20122.2530.0086500mg/l0.0022500
8/1/20124.5130.0090100mg/l0.0045100
9/1/20122.0330.0063800mg/l0.0020300
10/1/20120.8730.0047300mg/l0.0008700
11/1/20121.9030.0033100mg/l0.0019000
12/1/20121.5630.0021900mg/l0.0015600
1/1/20131.4530.0020500mg/l0.0014500
2/1/20132.8930.0017800mg/l0.0028900
3/1/20133.1130.0019600mg/l0.0031100
4/1/20131.3630.0020500mg/l0.0013600
5/1/20137.5130.0029800mg/l0.0075100
6/1/20138.1130.0040700mg/l0.0081100
7/1/20131.4930.0040800mg/l0.0014900
8/1/20136.4930.0046800mg/l0.0064900
9/1/20132.3130.0045500mg/l0.0023100
10/1/20134.1730.0050100mg/l0.0041700
11/1/20136.9620.0049200mg/l0.0069600
12/1/20132.0430.0039100mg/l0.0020400
1/1/201447.9040.0116500mg/l0.0479000
2/1/20142.7440.0110200mg/l0.0027400
3/1/20147.0940.0118200mg/l0.0070900
4/1/20141.3130.0113400mg/l0.0013100
5/1/20141.2130.0103800mg/l0.0012100
6/1/20141.3340.0102600mg/l0.0013300
7/1/20141.5940.0025500mg/l0.0015900
8/1/20141.3440.0023100mg/l0.0013400
9/1/20143.0440.0016400mg/l0.0030400
10/1/20149.2540.0029600mg/l0.0092500
11/1/20147.9440.0040800mg/l0.0079400
12/1/20141.1040.0040400mg/l0.0011000
1/1/20152.0530.0041200mg/l0.0020500
2/1/20155.4430.0048000mg/l0.0054400
3/1/20158.7830.0057600mg/l0.0087800
4/1/20153.0720.0047300mg/l0.0030700
5/1/20152.2520.0037800mg/l0.0022500
6/1/20153.6430.0042100mg/l0.0036400
7/1/20157.3420.0050900mg/l0.0073400
8/1/20150.9920.0043500mg/l0.0009900
9/1/20151.9820.0032100mg/l0.0019800
10/1/20151.1410.0028900mg/l0.0011400
11/1/20151.1210.0027000mg/l0.0011200
Target
mg/l
Threshold
0.02 mg/l
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 3.001 3.001
Mean 1.2866 0.8205 0.41642185
Low 0.63 0.239
No. of Samples 4 149

Five-year Trend Graph

      
1/1/2011909.0010.9090000mg/l0.9090000
2/1/2011646.0010.7775000mg/l0.6460000
3/1/2011549.0010.7013300mg/l0.5490000
4/1/2011637.0010.6852500mg/l0.6370000
5/1/2011606.0010.6694000mg/l0.6060000
6/1/20111141.0010.7480000mg/l1.1410000
7/1/2011531.0010.6850000mg/l0.5310000
8/1/20111180.0010.7740000mg/l1.1800000
9/1/2011707.0010.8003300mg/l0.7070000
10/1/2011561.0010.7876700mg/l0.5610000
11/1/2011645.0010.7941700mg/l0.6450000
12/1/2011511.0010.6891700mg/l0.5110000
1/1/2012435.0010.6731700mg/l0.4350000
2/1/2012581.0010.5733300mg/l0.5810000
3/1/2012766.0010.5831700mg/l0.7660000
4/1/2012695.0010.6055000mg/l0.6950000
5/1/20121948.0010.8226700mg/l1.9480000
6/1/20121626.0011.0085000mg/l1.6260000
7/1/20121079.0011.1158300mg/l1.0790000
8/1/2012972.0011.1810000mg/l0.9720000
9/1/2012611.0011.1551700mg/l0.6110000
10/1/2012837.0011.1788300mg/l0.8370000
11/1/2012542.0010.9445000mg/l0.5420000
12/1/2012566.0010.7678300mg/l0.5660000
1/1/2013439.0010.6611700mg/l0.4390000
2/1/2013513.0010.5846700mg/l0.5130000
3/1/2013491.0010.5646700mg/l0.4910000
4/1/2013489.0010.5066700mg/l0.4890000
5/1/2013524.0010.5036700mg/l0.5240000
6/1/2013879.0010.5558300mg/l0.8790000
7/1/2013940.0010.6393300mg/l0.9400000
8/1/20131227.0010.7583300mg/l1.2270000
9/1/20131383.0010.9070000mg/l1.3830000
10/1/2013884.0010.9728300mg/l0.8840000
12/1/2013669.0011.0206000mg/l0.6690000
1/1/2014752.0020.9830000mg/l0.7520000
2/1/2014668.0020.8712000mg/l0.6680000
3/1/2014884.0020.7714000mg/l0.8840000
4/1/2014749.0010.7444000mg/l0.7490000
5/1/2014753.0010.7458300mg/l0.7530000
6/1/2014738.0010.7573300mg/l0.7380000
7/1/2014679.0010.7451700mg/l0.6790000
8/1/2014649.0010.7420000mg/l0.6490000
9/1/2014871.0010.7398300mg/l0.8710000
10/1/20141678.0020.8946700mg/l1.6780000
11/1/20141146.0020.9601700mg/l1.1460000
12/1/2014712.0020.9558300mg/l0.7120000
1/1/2015630.0010.9476700mg/l0.6300000
2/1/20151701.0011.1230000mg/l1.7010000
3/1/20153001.0011.4780000mg/l3.0010000
6/1/2015852.0011.5460000mg/l0.8520000
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2015
Historical
period of record
High 1.21 1.60
Mean 0.2116 0.1617 0.17209491
Low 0.09 0.041
No. of Samples 13 222

Five-year Trend Graph

      
1/1/2011204.0030.2040000mg/l0.2040000
2/1/201179.0030.1415000mg/l0.0790000
3/1/201174.0030.1190000mg/l0.0740000
4/1/201142.0030.0997500mg/l0.0420000
5/1/201141.0030.0880000mg/l0.0410000
6/1/2011230.0030.1116700mg/l0.2300000
7/1/2011207.0030.1121700mg/l0.2070000
8/1/2011330.0030.1540000mg/l0.3300000
9/1/2011208.0030.1763300mg/l0.2080000
10/1/2011145.0030.1935000mg/l0.1450000
11/1/2011116.0030.2060000mg/l0.1160000
12/1/2011116.0030.1870000mg/l0.1160000
1/1/201273.0030.1646700mg/l0.0730000
2/1/2012182.0030.1400000mg/l0.1820000
3/1/2012276.0030.1513300mg/l0.2760000
4/1/2012150.0030.1521700mg/l0.1500000
5/1/2012637.0030.2390000mg/l0.6370000
6/1/2012547.0030.3108300mg/l0.5470000
7/1/2012280.0030.3453300mg/l0.2800000
8/1/2012208.0030.3496700mg/l0.2080000
9/1/2012141.0030.3271700mg/l0.1410000
10/1/2012110.0030.3205000mg/l0.1100000
11/1/201252.0030.2230000mg/l0.0520000
12/1/2012145.0030.1560000mg/l0.1450000
1/1/201365.0030.1201700mg/l0.0650000
2/1/2013211.0030.1206700mg/l0.2110000
3/1/201395.0030.1130000mg/l0.0950000
4/1/201382.0030.1083300mg/l0.0820000
5/1/201342.0030.1066700mg/l0.0420000
6/1/2013152.0030.1078300mg/l0.1520000
7/1/2013199.0030.1301700mg/l0.1990000
8/1/2013392.0030.1603300mg/l0.3920000
9/1/2013321.0030.1980000mg/l0.3210000
10/1/2013313.0030.2365000mg/l0.3130000
11/1/2013247.0020.2706700mg/l0.2470000
12/1/2013198.0030.2783300mg/l0.1980000
1/1/2014147.0040.2696700mg/l0.1470000
2/1/2014191.0040.2361700mg/l0.1910000
3/1/2014143.0040.2065000mg/l0.1430000
4/1/2014140.0030.1776700mg/l0.1400000
5/1/201487.0030.1510000mg/l0.0870000
6/1/2014116.0040.1373300mg/l0.1160000
7/1/2014183.0040.1433300mg/l0.1830000
8/1/2014268.0040.1561700mg/l0.2680000
9/1/2014321.0040.1858300mg/l0.3210000
10/1/2014268.0040.2071700mg/l0.2680000
11/1/2014157.0040.2188300mg/l0.1570000
12/1/201475.0040.2120000mg/l0.0750000
1/1/201590.0030.1965000mg/l0.0900000
2/1/2015128.0030.1731700mg/l0.1280000
3/1/20151210.0030.3213300mg/l1.2100000
4/1/2015113.0020.2955000mg/l0.1130000
5/1/2015221.0020.3061700mg/l0.2210000
6/1/2015205.0030.3278300mg/l0.2050000
7/1/2015329.0020.3676700mg/l0.3290000
8/1/2015157.0020.3725000mg/l0.1570000
9/1/2015162.0020.1978300mg/l0.1620000
10/1/201573.0010.1911700mg/l0.0730000
11/1/2015110.0010.1726700mg/l0.1100000
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
2015
Historical
period of record
High 87.00 213.70
Mean 79.76 66.91 34.42728
Low 72.90 6.60
No. of Samples 8 207

Five-year Trend Graph

      
2/1/201198.00398.0000000percent (%)98.0000000
3/1/201192.60395.3000000percent (%)92.6000000
4/1/201171.10387.2300000percent (%)71.1000000
5/1/201160.90380.6500000percent (%)60.9000000
1/1/201237.40337.4000000percent (%)37.4000000
2/1/201269.70353.5500000percent (%)69.7000000
3/1/201281.30362.8000000percent (%)81.3000000
4/1/201250.70359.7800000percent (%)50.7000000
5/1/201262.10360.2400000percent (%)62.1000000
7/1/201251.10362.9800000percent (%)51.1000000
8/1/201258.20360.6800000percent (%)58.2000000
9/1/201246.80353.7800000percent (%)46.8000000
10/1/201287.20361.0800000percent (%)87.2000000
12/1/201276.20363.9000000percent (%)76.2000000
1/1/201392.80372.2400000percent (%)92.8000000
2/1/201352.70371.1400000percent (%)52.7000000
3/1/201381.00377.9800000percent (%)81.0000000
5/1/201359.90372.5200000percent (%)59.9000000
6/1/201350.10367.3000000percent (%)50.1000000
7/1/2013106.00369.9400000percent (%)106.0000000
8/1/201374.20374.2400000percent (%)74.2000000
9/1/201372.80372.6000000percent (%)72.8000000
10/1/201349.10368.6800000percent (%)49.1000000
12/1/201357.10371.8400000percent (%)57.1000000
1/1/201460.40462.7200000percent (%)60.4000000
2/1/201454.10458.7000000percent (%)54.1000000
3/1/201471.30458.4000000percent (%)71.3000000
4/1/201425.10453.6000000percent (%)25.1000000
5/1/201440.20451.3700000percent (%)40.2000000
6/1/201463.80452.4800000percent (%)63.8000000
7/1/2014106.70460.2000000percent (%)106.7000000
8/1/201468.90462.6700000percent (%)68.9000000
9/1/201424.50454.8700000percent (%)24.5000000
10/1/201447.20458.5500000percent (%)47.2000000
11/1/201489.10466.7000000percent (%)89.1000000
12/1/2014132.10478.0800000percent (%)132.1000000
1/1/201583.10374.1500000percent (%)83.1000000
2/1/201576.80375.4700000percent (%)76.8000000
3/1/201572.90383.5300000percent (%)72.9000000
6/1/201587.00379.9500000percent (%)87.0000000
7/1/201566.30175.7500000percent (%)66.3000000
8/1/2015132.10189.5800000percent (%)132.1000000
9/1/2015135.101105.1300000percent (%)135.1000000
10/1/201555.30195.1600000percent (%)55.3000000
11/1/201592.30194.6800000percent (%)92.3000000
Target
percent (%)
Threshold
38.00 percent (%)

Rainfall

Units: inches Year
2015
Historical
period of record
High 46.07 47.76
Mean 12.7233074178199
Low 7.86
No. of Samples 365 4,738

Five-year Trend Graph

      
1/1/20112.77312.7700000inches2.7700000
2/1/20110.39280.3900000inches0.3900000
3/1/20117.36317.3600000inches7.3600000
4/1/20110.88300.8800000inches0.8800000
5/1/20112.51312.5100000inches2.5100000
6/1/20112.94302.9400000inches2.9400000
7/1/20116.35316.3500000inches6.3500000
8/1/20119.13319.1300000inches9.1300000
9/1/20114.36304.3600000inches4.3600000
10/1/20111.40301.4000000inches1.4000000
11/1/20111.76301.7600000inches1.7600000
12/1/20110.42300.4200000inches0.4200000
1/1/20120.69290.6900000inches0.6900000
2/1/20120.65290.6500000inches0.6500000
3/1/20121.38311.3800000inches1.3800000
4/1/20121.40241.4000000inches1.4000000
5/1/20121.89311.8900000inches1.8900000
6/1/201213.373013.3700000inches13.3700000
7/1/20125.10315.1000000inches5.1000000
8/1/20126.55316.5500000inches6.5500000
9/1/20123.32303.3200000inches3.3200000
10/1/20121.98311.9800000inches1.9800000
11/1/20120.01280.0100000inches0.0100000
12/1/20122.04312.0400000inches2.0400000
1/1/20130.26310.2600000inches0.2600000
2/1/20131.01231.0100000inches1.0100000
3/1/20131.53301.5300000inches1.5300000
4/1/20132.81302.8100000inches2.8100000
5/1/20132.05312.0500000inches2.0500000
6/1/201314.823014.8200000inches14.8200000
7/1/20136.29316.2900000inches6.2900000
8/1/20138.54318.5400000inches8.5400000
9/1/20138.04308.0400000inches8.0400000
10/1/20131.05311.0500000inches1.0500000
11/1/20131.19301.1900000inches1.1900000
12/1/20130.17310.1700000inches0.1700000
1/1/20145.24315.2400000inches5.2400000
2/1/20141.28281.2800000inches1.2800000
3/1/20144.63314.6300000inches4.6300000
4/1/20141.34291.3400000inches1.3400000
5/1/20144.16314.1600000inches4.1600000
6/1/20143.57303.5700000inches3.5700000
7/1/20143.33313.3300000inches3.3300000
8/1/20144.10284.1000000inches4.1000000
9/1/20147.31257.3100000inches7.3100000
10/1/20142.32292.3200000inches2.3200000
11/1/20143.07303.0700000inches3.0700000
12/1/20140.44310.4400000inches0.4400000
1/1/20151.91311.9100000inches1.9100000
2/1/20155.14285.1400000inches5.1400000
3/1/20152.43312.4300000inches2.4300000
4/1/20150.65300.6500000inches0.6500000
5/1/20151.98311.9800000inches1.9800000
6/1/20153.00303.0000000inches3.0000000
7/1/201513.033113.0300000inches13.0300000
8/1/20155.46315.4600000inches5.4600000
9/1/20157.42307.4200000inches7.4200000
10/1/20151.59311.5900000inches1.5900000
11/1/20150.74300.7400000inches0.7400000
12/1/20152.72312.7200000inches2.7200000
Target
inches
Threshold
inches

Salinity

Units: PSS Year
2015
Historical
period of record
High 0.61 11.43
Mean 0.35 0.49 0.87097
Low 0.13 0.13
No. of Samples 8 185

Five-year Trend Graph

      
2/1/20110.6330.6300000PSS0.6300000
3/1/20110.6630.6500000PSS0.6600000
4/1/20110.6530.6500000PSS0.6500000
5/1/20110.7030.6600000PSS0.7000000
1/1/20120.7330.7300000PSS0.7300000
2/1/20120.4430.5900000PSS0.4400000
3/1/20120.6330.6000000PSS0.6300000
4/1/20120.4830.5700000PSS0.4800000
5/1/20120.4830.5500000PSS0.4800000
7/1/20120.3430.4700000PSS0.3400000
8/1/20120.3230.4500000PSS0.3200000
9/1/20120.5130.4300000PSS0.5100000
10/1/20120.4030.4100000PSS0.4000000
12/1/20120.6230.4400000PSS0.6200000
1/1/20130.6630.5000000PSS0.6600000
2/1/20130.5130.5400000PSS0.5100000
3/1/20130.5030.5400000PSS0.5000000
5/1/20130.6630.5900000PSS0.6600000
6/1/20130.2630.5200000PSS0.2600000
7/1/20130.5830.5000000PSS0.5800000
8/1/20130.3230.4600000PSS0.3200000
9/1/20130.5230.4700000PSS0.5200000
10/1/20130.3830.4500000PSS0.3800000
12/1/20130.5330.4700000PSS0.5300000
1/1/20140.4240.4300000PSS0.4200000
2/1/20140.5740.4800000PSS0.5700000
3/1/20140.2540.4300000PSS0.2500000
4/1/20140.5940.4700000PSS0.5900000
5/1/20140.5440.4800000PSS0.5400000
6/1/20140.5740.4900000PSS0.5700000
7/1/20140.4340.4900000PSS0.4300000
8/1/20140.5040.4800000PSS0.5000000
9/1/20140.4440.5100000PSS0.4400000
10/1/20140.4140.4800000PSS0.4100000
11/1/20140.3840.4600000PSS0.3800000
12/1/20140.6140.4600000PSS0.6100000
1/1/20150.6130.4900000PSS0.6100000
2/1/20150.6030.5100000PSS0.6000000
3/1/20150.1330.4600000PSS0.1300000
6/1/20150.3230.4200000PSS0.3200000
7/1/20150.3410.3500000PSS0.3400000
8/1/20150.4010.3000000PSS0.4000000
9/1/20150.5410.4000000PSS0.5400000
10/1/20150.6110.4400000PSS0.6100000
11/1/20150.4610.4500000PSS0.4600000

Turbidity

Units: NTU Year
2015
Historical
period of record
High 9.00 54.40
Mean 1.59 1.37 3.84736
Low 0.49 0.40
No. of Samples 13 218

Five-year Trend Graph

      
1/1/20112.8032.8000000NTU2.8000000
2/1/20111.2232.0100000NTU1.2200000
3/1/20111.4331.8200000NTU1.4300000
4/1/20111.1231.6400000NTU1.1200000
5/1/20110.9831.5100000NTU0.9800000
6/1/20112.8031.7300000NTU2.8000000
7/1/20117.8032.5600000NTU7.8000000
8/1/20111.0832.5400000NTU1.0800000
9/1/20111.0432.4700000NTU1.0400000
10/1/20110.6632.3900000NTU0.6600000
11/1/20110.8532.3700000NTU0.8500000
12/1/20110.6432.0100000NTU0.6400000
1/1/20120.6030.8100000NTU0.6000000
2/1/20120.7030.7500000NTU0.7000000
3/1/20123.0031.0800000NTU3.0000000
4/1/20121.4031.2000000NTU1.4000000
5/1/20122.4031.4600000NTU2.4000000
6/1/20121.9031.6700000NTU1.9000000
7/1/20120.8931.7200000NTU0.8900000
8/1/20121.8031.9000000NTU1.8000000
9/1/20120.8131.5300000NTU0.8100000
10/1/20120.8031.4300000NTU0.8000000
11/1/20120.7331.1600000NTU0.7300000
12/1/20121.1931.0400000NTU1.1900000
1/1/20130.7531.0100000NTU0.7500000
2/1/20131.0030.8800000NTU1.0000000
3/1/20130.7030.8600000NTU0.7000000
4/1/20131.0030.9000000NTU1.0000000
5/1/20131.2030.9700000NTU1.2000000
6/1/20131.2030.9800000NTU1.2000000
7/1/20130.7030.9700000NTU0.7000000
8/1/20131.2531.0100000NTU1.2500000
9/1/20131.0031.0600000NTU1.0000000
10/1/20130.6030.9900000NTU0.6000000
11/1/20131.4021.0300000NTU1.4000000
12/1/20130.9030.9800000NTU0.9000000
1/1/20141.9041.1800000NTU1.9000000
2/1/20141.3041.1800000NTU1.3000000
3/1/20144.2041.7200000NTU4.2000000
4/1/20141.9031.9300000NTU1.9000000
5/1/20141.6031.9700000NTU1.6000000
6/1/20141.1042.0000000NTU1.1000000
7/1/20141.4041.9200000NTU1.4000000
8/1/20141.4041.9300000NTU1.4000000
9/1/20141.3041.4500000NTU1.3000000
10/1/20141.5041.3800000NTU1.5000000
11/1/20141.6041.3800000NTU1.6000000
12/1/20140.8041.3300000NTU0.8000000
1/1/20151.0031.2700000NTU1.0000000
2/1/20151.5031.2800000NTU1.5000000
3/1/20159.0032.5700000NTU9.0000000
4/1/20151.3022.5300000NTU1.3000000
5/1/20150.8522.4100000NTU0.8500000
6/1/20151.7032.5600000NTU1.7000000
7/1/20152.1022.7400000NTU2.1000000
8/1/20150.6822.6100000NTU0.6800000
9/1/20150.4921.1900000NTU0.4900000
10/1/20150.5011.0500000NTU0.5000000
11/1/20150.6011.0100000NTU0.6000000
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 »

Water quality data are not available for the tidal portion of this creek.

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 »

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Impervious Features

Matheny Creek is located within the Little Sarasota Bay Watershed. View details about the Little Sarasota Bay Watershed »

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

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

of the land area within the Matheny Creek Basin is covered by impervious surfaces.

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Land Use / Land Cover

Matheny Creek is located within the Little Sarasota Bay Watershed. View details about the Little Sarasota Bay Watershed »

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

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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.