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Report Year: 2016
Twelve Mile Creek Lake, Union County
Summary Data Table
Parameter6/13/20168/1/20169/14/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)10.411.610.510.811.010.710.510.410.610.910.8--11.510.410.210.410.59.8
Thermocline Depth (m)5.86.58.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.30.61.01.31.41.31.41.10.91.31.5--1.21.21.01.61.41.1
Temperature(oC)23.425.021.823.423.521.422.623.924.523.922.9--18.122.322.722.622.724.7
Dissolved Oxygen (mg/L)9.74.66.67.08.95.06.76.98.76.37.6--7.17.59.58.48.17.3
Dissolved Oxygen Saturation (%)114567581.7104.155.876.882.6104.973.988.3--74.786.4106.896.795.588.7
Specific Conductivity (μS/cm)210.0210.0220.0213.3240.0266.7266.7260.0223.3246.7270.0--354.3312.7321.1303.6284.2298.8
Turbidity (NTU)3.418.9<0.37.48.56.78.012.617.08.27.5--315.313.624.09.69.122.8
Chlorophyll a (μg/L)19.934.340.331.544.213.140.466.534.425.112.0--4.424.614.923.2135.47.7
Total Phosphorus as P (μg/L)31.7177.8217.9142.587161107.2121.060.983.483.1--3532465259-
SRP as P (μg/L)<2.899.3118.472.215.084.037.033.1<1111.130.2---<1<14.2--
TKN (mg/L)<0.51.071.370.951.191.171.471.590.501.16---------
Total Dissolved Solids (g/L)0.10.10.10.10.20.20.20.20.1----------
Total Nitrogen as N (mg/L)----------1.1--2.402.231.501.342.641.32
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.686.70226.50102<26150141187<145157<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-3201192316<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.340.26101<0.5----1.260.390.431.640.16
TN:TP ratio----------14--6969342652-
pH9.28.78.18.78.87.98.48.18.98.18.6---8.48.48.38.17.5
Alkalinity as CaCO3 (mg/L)61859380991029910585101116---1158611892115
Silica as Si (mg/L)--------------1.791.721.50--
Dissolved Organic Carbon (mg/L)15.9522.0725.8021.2711.6265.776<7.6<6.4<6.2--6.517.1510.277.95--
Inorganic Suspended Solids (mg/L)363453<3.235<4<4--633258
Volatile Suspended Solids (mg/L)267544711<8<9<8--557435
Total Suspended Solids (mg/L)512109978141388--118115712
Carlson Trophic State Index (Secchi)*4868615655565659615754--585760545558
Carlson Trophic State Index (Chl a)*6065676468566772656255--456257617951
Carlson Trophic State Index (TP)*5479827669777273636868--5554596163-
*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