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Report Year: 2016
Lake Iowa, Iowa County
Summary Data Table
Parameter6/20/20168/9/20169/18/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)7.88.17.97.97.37.37.36.87.77.48.1--8.08.48.58.88.47.7
Thermocline Depth (m)2.24.06.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.60.90.71.21.10.90.70.70.60.6--2.52.40.81.11.31.1
Temperature(oC)29.526.121.725.823.422.522.523.122.624.123.1--25.423.225.026.622.926.2
Dissolved Oxygen (mg/L)11.35.84.07.06.88.86.87.57.910.88.6--11.79.09.59.29.110.7
Dissolved Oxygen Saturation (%)148714588.180.0101.879.387.393.8129.5100.7--142.2105.8114.1113.8104.8132.3
Specific Conductivity (μS/cm)220.0260.0260.0246.7236.7200.0223.3270.0266.7263.3246.7--272.3321.2256.8364.5235.0236.4
Turbidity (NTU)9.68.010.29.37.414.38.915.416.512.926.0--13.85.120.712.217.756.1
Chlorophyll a (μg/L)54.263.033.150.117.914.542.453.641.622.649.7--158.044.533.820.926.526.0
Total Phosphorus as P (μg/L)72.393.485.583.75811198.4104.578.986.7101.9--4260666080-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.344.8<1428.5<11<8<9--<12.11.13.6--
TKN (mg/L)1.271.551.271.361.321.271.691.691.972.44---------
Total Dissolved Solids (g/L)0.10.20.20.20.20.10.10.20.2----------
Total Nitrogen as N (mg/L)----------1.7--1.322.491.481.122.351.58
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6350.80116215194446100271198<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-201239776<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.070.16<0.070.130.20<0.14<0.06<0.4<0.5---0.210.550.180.260.910.13
TN:TP ratio----------17--3444222329-
pH9.28.47.98.58.18.78.28.28.37.98.3--8.98.68.88.68.37.9
Alkalinity as CaCO3 (mg/L)9098113100958789108104112104--99118749383151
Silica as Si (mg/L)-------------2.764.373.022.73--
Dissolved Organic Carbon (mg/L)19.6425.2628.8124.5719.8475.427<7.6<6.47--9.105.6612.009.30--
Inorganic Suspended Solids (mg/L)213233<3.23<5<48--1315354
Volatile Suspended Solids (mg/L)128484588<8<914--1399555
Total Suspended Solids (mg/L)1497107791191122--14914997
Carlson Trophic State Index (Secchi)*6669626558586166656768--474764585759
Carlson Trophic State Index (Chl a)*7071656959576770676169--806865606363
Carlson Trophic State Index (TP)*6670686863727071676971--5863656367-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/20/20168/9/20169/18/2016

Contact Limnology Laboratory, Iowa State University