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Report Year: 2016
George Wyth Lake, Black Hawk County
Summary Data Table
Parameter6/6/20167/25/20169/7/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.54.74.64.63.84.34.53.54.45.14.54.13.74.64.54.44.74.44.6
Thermocline Depth (m)3.22.01.2N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.71.20.91.61.01.31.00.91.21.80.70.81.21.21.61.41.12.10.9
Temperature(oC)22.727.925.325.325.623.627.125.625.924.224.725.425.526.424.424.426.024.724.7
Dissolved Oxygen (mg/L)10.711.79.910.811.09.79.29.711.910.58.211.110.510.79.711.111.76.911.3
Dissolved Oxygen Saturation (%)124149120131.1134.4114.1115.8118.4145.1124.598.7135.5128.1132.8116.8133.7145.090.2135.8
Specific Conductivity (μS/cm)530.0460.0460.0483.3496.7486.7485.0553.3473.3493.3430.0550.4617.4570.8660.4553.6545.1376.8447.4
Turbidity (NTU)3.14.09.65.66.64.36.47.65.22.414.113.6120.844.58.616.417.16.0139.2
Chlorophyll a (μg/L)14.020.452.128.843.422.713.827.521.17.629.334.125.348.216.219.316.711.09.5
Total Phosphorus as P (μg/L)33.226.058.539.2434131.278.649.038.375.036363440435224-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<8<9<1<1<13.12.41.2--
TKN (mg/L)0.620.681.220.840.961.070.830.770.75<0.5---------
Total Dissolved Solids (g/L)0.40.30.30.30.30.30.30.40.3----------
Total Nitrogen as N (mg/L)----------1.30.951.080.880.611.251.111.011.21
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)12.55<0.6<0.6<0.6<26<26<10<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)2-7-1-2-30<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<0.5-0.120.120.130.240.370.320.380.20
TN:TP ratio----------1727312616302548-
pH8.58.78.58.68.78.38.48.48.38.08.28.58.48.48.48.48.48.47.4
Alkalinity as CaCO3 (mg/L)14814014714510913513013012815612215213512714195117122125
Silica as Si (mg/L)-------------2.551.752.102.67--
Dissolved Organic Carbon (mg/L)27.9225.6033.8029.1110.7344.665<7.6<6.4<6.24.364.274.863.847.987.56--
Inorganic Suspended Solids (mg/L)35336<2.1<3.22<5<4<434233253
Volatile Suspended Solids (mg/L)45753458<8<91167744555
Total Suspended Solids (mg/L)7109996710<66139109777108
Carlson Trophic State Index (Secchi)*46586253605659615852656457575355594961
Carlson Trophic State Index (Chl a)*56606964686156636150646562695860585453
Carlson Trophic State Index (TP)*555163575858546760576656565557596150-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/6/20167/25/20169/7/2016

Contact Limnology Laboratory, Iowa State University