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Report Year: 2016
Greenfield Lake, Adair County
Summary Data Table
Parameter6/13/20168/1/20169/13/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.35.96.26.15.96.06.05.36.26.36.0--6.76.76.56.37.15.0
Thermocline Depth (m)4.94.4NilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.80.50.71.00.70.70.90.91.00.70.9--2.31.22.01.21.60.9
Temperature(oC)25.425.522.424.524.121.822.823.824.724.223.4--24.122.522.926.624.325.5
Dissolved Oxygen (mg/L)6.96.57.16.88.113.46.46.58.97.29.3--7.59.29.36.810.69.8
Dissolved Oxygen Saturation (%)84798181.695.8151.773.675.8109.784.9109.3--89.2105.7107.184.7131.0119.9
Specific Conductivity (μS/cm)320.0250.0270.0280.0276.7256.7343.3270.0296.7303.3303.3--343.3378.3344.8374.4324.5348.1
Turbidity (NTU)1.816.87.78.813.59.510.18.68.57.57.0--9.810.44.84.57.021.3
Chlorophyll a (μg/L)10.263.874.649.567.144.517.552.431.925.939.7--34.673.314.215.218.719.5
Total Phosphorus as P (μg/L)37.7202.4185.1141.7120126100.396.073.081.881.8--122698316271-
SRP as P (μg/L)<2.864.748.737.511.221.339.010.9<11<8<9--11.11.410.53.1--
TKN (mg/L)<0.221.531.160.951.341.720.941.110.820.61---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------0.9--1.081.161.081.051.421.14
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6165.05<0.651<26<2695109<145136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-2230701<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.200.300<0.06<0.4<0.5---0.160.230.160.120.550.12
TN:TP ratio----------11--1119131221-
pH8.58.48.48.48.58.68.18.28.48.18.4--8.18.58.28.37.97.9
Alkalinity as CaCO3 (mg/L)13197114114119104128103104119118--12513592124112130
Silica as Si (mg/L)-------------2.332.742.611.75--
Dissolved Organic Carbon (mg/L)24.7624.3127.8125.6313.0954.865<7.6<6.4<6.2--6.653.489.778.29--
Inorganic Suspended Solids (mg/L)11636442<54<4--234858
Volatile Suspended Solids (mg/L)2127711847<8<9<8--662645
Total Suspended Solids (mg/L)41313101712710101011--9957914
Carlson Trophic State Index (Secchi)*5172656066656261606462--485750585462
Carlson Trophic State Index (Chl a)*5371736972685969656367--657357575960
Carlson Trophic State Index (TP)*5681797673747170666868--7365687766-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/13/20168/1/20169/13/2016

Contact Limnology Laboratory, Iowa State University