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Report Year: 2016
Thayer Lake, Union County
Summary Data Table
Parameter6/13/20168/1/20169/14/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)2.62.62.42.52.82.52.31.82.02.12.1--2.42.32.32.32.42.4
Thermocline Depth (m)1.52.0NilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.20.60.60.80.51.01.41.40.80.60.4--0.40.20.40.40.70.6
Temperature(oC)27.725.121.924.923.220.923.524.325.024.624.1--25.322.924.327.124.226.5
Dissolved Oxygen (mg/L)11.65.30.85.97.05.27.77.98.58.27.4--10.58.28.410.18.17.1
Dissolved Oxygen Saturation (%)14864973.782.060.190.094.7103.498.887.4--129.696.398.4127.399.387.9
Specific Conductivity (μS/cm)320.0250.0270.0280.0206.7240.0256.7246.7220.0260.0240.0--318.8298.6330.9363.3222.9316.4
Turbidity (NTU)5.515.27.99.555.28.15.67.512.424.027.0--320.6135.949.123.140.6133.0
Chlorophyll a (μg/L)25.3117.456.366.3115.211.16.716.621.515.524.3--101.773.126.817.924.611.1
Total Phosphorus as P (μg/L)64.2191.1152.2135.82209142.741.579.5114.797.4--10017813084139-
SRP as P (μg/L)<2.83.33.3<2.822.314.6<1410.4<1118.0<9--2.830.110.41.8--
TKN (mg/L)0.562.111.811.491.581.310.900.812.01<0.26---------
Total Dissolved Solids (g/L)0.20.20.20.20.10.20.20.20.1----------
Total Nitrogen as N (mg/L)----------1.0--1.761.591.431.161.531.43
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.648.80<0.614<26461518<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-120031<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.12<0.14<0.06<0.4<0.5---0.780.320.250.390.200.12
TN:TP ratio----------10--189121512-
pH8.57.97.78.08.07.88.28.38.37.88.3--8.48.28.08.48.27.8
Alkalinity as CaCO3 (mg/L)12510310511188969910187107106--1251229014584126
Silica as Si (mg/L)-------------6.1811.604.312.99--
Dissolved Organic Carbon (mg/L)27.6526.8731.7828.7714.5687.798<7.699--9.6010.8412.1310.49--
Inorganic Suspended Solids (mg/L)8245583<3.2381010--12482681315
Volatile Suspended Solids (mg/L)<11511820235<8<99--1016117513
Total Suspended Solids (mg/L)817151377648141819--226436151828
Carlson Trophic State Index (Secchi)*5769676369605556626873--738175736467
Carlson Trophic State Index (Chl a)*6277707277544958615762--767363596254
Carlson Trophic State Index (TP)*6480777582695858677370--7179746875-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/13/20168/1/20169/14/2016

Contact Limnology Laboratory, Iowa State University