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Report Year: 2016
White Oak Lake, Mahaska County
Summary Data Table
Parameter6/22/20168/8/20169/19/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.44.34.34.34.94.74.24.34.64.64.8--5.35.25.24.84.95.2
Thermocline Depth (m)2.02.23.5N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.50.50.61.00.70.70.60.50.50.4--0.61.41.10.70.50.3
Temperature(oC)27.926.923.226.024.022.524.124.023.724.923.2--28.324.125.227.625.624.5
Dissolved Oxygen (mg/L)6.210.68.58.47.67.611.07.18.110.86.9--13.29.110.77.117.48.0
Dissolved Oxygen Saturation (%)7813399103.489.685.8133.985.099.5131.780.6--169.8108.6131.889.8211.195.4
Specific Conductivity (μS/cm)260.0250.0260.0256.7256.7260.0246.7260.0230.0200.0253.3--279.8270.7269.0288.4216.1203.9
Turbidity (NTU)10.315.016.714.020.115.427.016.430.819.418.3--83.312.320.033.044.043.7
Chlorophyll a (μg/L)35.478.680.064.769.431.098.729.439.441.443.7--136.623.821.441.383.011.7
Total Phosphorus as P (μg/L)111.397.9110.9106.7115115180.1109.9133.4121.1152.2--12583121115170-
SRP as P (μg/L)<2.8<2.8<2.8<2.814.123.037.912.1<11<8<9--<112.58.96.8--
TKN (mg/L)1.661.571.901.711.951.222.141.341.922.05---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.1----------
Total Nitrogen as N (mg/L)----------1.7--1.621.351.411.212.152.34
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)145.25<0.6132.0592126144206175220<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)43-113186618<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.150.121<0.061<0.5---0.130.340.160.310.430.42
TN:TP ratio----------11--1317121413-
pH8.88.98.48.78.28.08.88.18.58.38.4--8.98.58.78.58.68.1
Alkalinity as CaCO3 (mg/L)818310289100107831018182100--10289719493130
Silica as Si (mg/L)-------------4.092.632.625.44--
Dissolved Organic Carbon (mg/L)19.4524.3828.5724.1324.4788.458<7.6<6.47--6.7113.7812.7612.79--
Inorganic Suspended Solids (mg/L)3333475712817--3444516
Volatile Suspended Solids (mg/L)19969712913910--1161110107
Total Suspended Solids (mg/L)51211914141716251727--141015141523
Carlson Trophic State Index (Secchi)*6670696860666668707072--675558646976
Carlson Trophic State Index (Chl a)*6673747272647664676768--796261677455
Carlson Trophic State Index (TP)*7270727173737972757377--7468737378-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/22/20168/8/20169/19/2016

Contact Limnology Laboratory, Iowa State University