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Report Year: 2016
Otter Creek Lake, Tama County
Summary Data Table
Parameter6/22/20168/10/20169/18/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)7.56.96.97.16.96.96.86.87.17.27.2--6.57.66.97.66.26.9
Thermocline Depth (m)4.04.06.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.80.60.50.60.60.50.50.50.50.70.8--0.40.81.01.31.70.8
Temperature(oC)25.926.121.424.523.022.023.122.821.622.625.9--26.124.024.125.324.525.1
Dissolved Oxygen (mg/L)5.67.97.67.08.29.610.06.65.98.39.3--10.59.69.99.26.17.4
Dissolved Oxygen Saturation (%)69988684.297.6111.2117.975.266.999.2114.8--129.8114.6117.8112.378.591.2
Specific Conductivity (μS/cm)340.0280.0280.0300.0293.3260.0266.7303.3320.0325.0300.0--299.8418.3314.6341.5292.2338.9
Turbidity (NTU)4.611.517.011.016.222.724.018.126.79.911.3--38.132.632.321.99.212.7
Chlorophyll a (μg/L)22.543.061.342.359.689.548.071.873.932.547.0--202.753.827.925.18.720.5
Total Phosphorus as P (μg/L)55.476.087.472.96795141.0135.789.959.874.9--81896913553-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.627.6<10<11<8<9--<11.61.857.9--
TKN (mg/L)0.891.141.281.102.061.961.581.581.971.96---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------1.2--1.615.371.331.241.641.10
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.61725023<14238187<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-1-3-3-283<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.160.120<0.06<0.4<0.5---0.153.500.190.120.560.15
TN:TP ratio----------17--1958201340-
pH8.28.88.48.58.48.68.88.58.38.18.2--8.88.78.58.48.07.4
Alkalinity as CaCO3 (mg/L)15312112813413411581134135149140--136143100143151155
Silica as Si (mg/L)-------------3.673.422.652.71--
Dissolved Organic Carbon (mg/L)27.5128.7131.3729.2025.06155.146<7.6<6.4<6.2--6.494.319.599.26--
Inorganic Suspended Solids (mg/L)611472557<5<4<4--334614
Volatile Suspended Solids (mg/L)71312111315141212911--161010844
Total Suspended Solids (mg/L)1324161815191920151014--1912141278
Carlson Trophic State Index (Secchi)*6369696767716970716463--736360575263
Carlson Trophic State Index (Chl a)*6168716771756973736568--837063625260
Carlson Trophic State Index (TP)*6267696665707675696366--6869657561-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/22/20168/10/20169/18/2016

Contact Limnology Laboratory, Iowa State University