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Report Year: 2016
Lake Geode, Henry County
Summary Data Table
Parameter5/25/20167/12/20168/26/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)12.712.312.512.512.812.712.612.713.213.112.913.012.513.213.113.113.212.513.7
Thermocline Depth (m)2.14.04.4N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)5.01.70.62.41.12.01.52.21.61.02.01.11.64.33.44.62.52.31.4
Temperature(oC)20.927.126.024.722.325.224.925.325.727.023.726.123.825.824.225.228.823.624.1
Dissolved Oxygen (mg/L)12.811.416.413.59.712.412.010.012.011.99.211.910.010.411.011.69.811.58.5
Dissolved Oxygen Saturation (%)143143203162.8111.0150.4144.9120.2148.3148.9108.7146.4117.6128.5131.3142.5130.6139.4101.5
Specific Conductivity (μS/cm)430.0380.0280.0363.3310.0240.0260.0323.3286.7270.0296.7279.6350.8432.4360.4338.8347.7273.9249.8
Turbidity (NTU)1.63.124.19.612.46.28.03.07.56.96.718.221.72.72.94.218.910.714.5
Chlorophyll a (μg/L)2.66.276.528.419.522.511.215.418.315.710.042.048.49.212.47.36.710.97.3
Total Phosphorus as P (μg/L)14.414.033.020.5702873.135.825.459.271.454461630322468-
SRP as P (μg/L)<2.8<2.8<2.8<2.88.8<5.632.3<10<1114.518.2<1<1<1<12.73.8--
TKN (mg/L)0.720.571.020.770.870.771.080.780.74<0.26---------
Total Dissolved Solids (g/L)0.30.30.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------3.72.542.303.132.342.004.074.411.86
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)20.6011.40<0.66<26<26136<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)22-8-10971<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)3.812.170.8922.010.143322-1.450.992.731.751.373.493.691.23
TN:TP ratio----------6349561918062171201-
pH8.48.69.38.88.59.29.28.48.88.68.19.79.08.68.88.68.88.18.0
Alkalinity as CaCO3 (mg/L)140122101121108838111511098106891031361248910995161
Silica as Si (mg/L)-------------2.031.551.201.29--
Dissolved Organic Carbon (mg/L)27.6826.3124.4426.1412.4175.795<7.6<6.4<6.26.086.545.435.568.987.49--
Inorganic Suspended Solids (mg/L)12226<2.1<3.22<57432211345
Volatile Suspended Solids (mg/L)2495554<3.2<8<9<876232423
Total Suspended Solids (mg/L)26127117657108109552648
Carlson Trophic State Index (Secchi)*37526747595055495360505853394238474856
Carlson Trophic State Index (Chl a)*40487363606154575958536769525550495450
Carlson Trophic State Index (TP)*434255486552665651696662594453545065-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/25/20167/12/20168/26/2016

Contact Limnology Laboratory, Iowa State University