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Report Year: 2016
Lake Hendricks, Howard County
Summary Data Table
Parameter6/8/20167/26/20169/5/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)3.93.93.63.83.73.84.03.93.83.94.0--4.95.15.15.05.14.8
Thermocline Depth (m)3.01.71.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.20.60.40.71.11.10.70.71.20.70.9--0.81.11.80.91.52.0
Temperature(oC)21.327.122.323.624.922.621.424.125.023.023.9--25.422.823.125.023.923.8
Dissolved Oxygen (mg/L)9.515.610.211.79.512.511.79.913.69.010.1--11.812.113.411.715.010.4
Dissolved Oxygen Saturation (%)107196117139.8114.2144.7131.9117.1168.4106.3119.7--143.7141.2157.4144.0180.7124.1
Specific Conductivity (μS/cm)330.0250.0240.0273.3246.7263.3276.7280.0280.0270.0250.0--269.1326.8277.0344.1268.4319.7
Turbidity (NTU)9.811.724.015.26.314.615.313.617.16.210.4--17.613.326.423.522.35.1
Chlorophyll a (μg/L)12.788.6118.473.262.480.477.051.791.034.330.0--167.341.817.568.241.718.2
Total Phosphorus as P (μg/L)33.5113.9147.298.2103106106.4185.9130.3106.8137.7--956712313163-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.622.436.7<11<8<9--<13.42.32.2--
TKN (mg/L)0.892.012.001.631.552.711.921.702.203.46---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------2.1--3.049.443.071.494.515.29
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)36.10<0.6<0.61446610214<145451<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)4-14-4-5242651<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)6.113.902.8641.545.957112---1.768.521.700.263.883.54
TN:TP ratio----------20--521434611128-
pH8.49.49.29.09.09.29.18.98.88.58.8--9.38.89.39.29.37.4
Alkalinity as CaCO3 (mg/L)9976888883797288838882--8786618274107
Silica as Si (mg/L)-------------4.072.864.804.17--
Dissolved Organic Carbon (mg/L)18.7618.8220.8119.4614.1155.178<7.6<6.4<6.2--6.645.438.7610.80--
Inorganic Suspended Solids (mg/L)<0.84332543<5<44--133234
Volatile Suspended Solids (mg/L)412171181211711<99--166121165
Total Suspended Solids (mg/L)416201311171510121014--1591510169
Carlson Trophic State Index (Secchi)*5768756558586666576562--635852625450
Carlson Trophic State Index (Chl a)*5675777371747369756564--816759726759
Carlson Trophic State Index (TP)*5572767071717180747275--7065747464-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/8/20167/26/20169/5/2016

Contact Limnology Laboratory, Iowa State University