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Report Year: 2016
Casey Lake (Hickory Hills Lake), Tama County
Summary Data Table
Parameter6/7/20167/26/20169/8/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.05.96.06.06.16.06.05.95.96.46.3--6.16.35.96.05.96.2
Thermocline Depth (m)4.12.21.5N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.70.31.41.51.11.41.21.51.01.42.7--0.51.61.81.41.60.5
Temperature(oC)22.227.025.725.026.223.123.924.626.223.626.3--28.424.324.626.223.923.9
Dissolved Oxygen (mg/L)10.49.913.311.211.710.68.29.011.28.68.5--13.512.413.311.88.68.6
Dissolved Oxygen Saturation (%)119124162135.2146.1123.995.7109.1139.5101.1106.2--174.4149.7163.8147.5110.0102.0
Specific Conductivity (μS/cm)360.0260.0270.0296.7290.0273.3303.3393.3363.3313.3313.3--284.9406.2316.2361.8252.7304.2
Turbidity (NTU)<0.333.820.818.314.011.95.525.025.56.62.6--26.97.524.230.738.8260.0
Chlorophyll a (μg/L)7.3115.2103.775.490.780.320.545.054.026.49.0--210.750.225.638.514.111.4
Total Phosphorus as P (μg/L)16.9117.6133.589.312414894.6160.5154.883.863.1--13110682234123-
SRP as P (μg/L)<2.8<2.8<2.8<2.85.141.728.550.222.0<810.9--<146.19.22.3--
TKN (mg/L)<0.52.292.171.651.622.791.181.571.511.07---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.30.2----------
Total Nitrogen as N (mg/L)----------1.2--1.751.761.291.591.911.97
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)349.9522.45<0.6123<2617112617<145141190--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)259-211-21522<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.120<0.06<0.4<0.5---0.120.880.200.550.540.26
TN:TP ratio----------19--1323171249-
pH8.29.09.38.88.98.88.58.48.68.38.1--9.48.99.09.28.57.7
Alkalinity as CaCO3 (mg/L)144113122126122114123153129135149--11112395119119130
Silica as Si (mg/L)-------------5.824.032.583.69--
Dissolved Organic Carbon (mg/L)28.4727.6231.4029.1611.4375.156<7.6<6.4<6.2--7.425.4210.429.18--
Inorganic Suspended Solids (mg/L)<0.832111<2.1<3.2<2<5<4<4--442622
Volatile Suspended Solids (mg/L)21411941241112<9<8--7671037
Total Suspended Solids (mg/L)2161311151461314<5<5--71081166
Carlson Trophic State Index (Secchi)*4677555559555854595546--725451555371
Carlson Trophic State Index (Chl a)*5077767375746068706352--836962665755
Carlson Trophic State Index (TP)*4573756974767077776864--7471688374-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/7/20167/26/20169/8/2016

Contact Limnology Laboratory, Iowa State University