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Report Year: 2016
Belva Deer Lake, Keokuk County
Summary Data Table
Parameter5/25/20167/13/20168/24/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)11.411.111.111.210.811.311.311.611.511.711.711.511.2------
Thermocline Depth (m)1.83.94.7N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)3.00.70.81.52.40.81.21.31.51.21.92.92.9------
Temperature(oC)21.326.724.724.223.023.925.423.923.526.122.626.424.2------
Dissolved Oxygen (mg/L)9.810.28.69.58.510.211.57.98.410.97.38.27.7------
Dissolved Oxygen Saturation (%)110127103113.599.5120.5141.393.198.9135.084.4102.892.0------
Specific Conductivity (μS/cm)260.0240.0210.0236.7243.3203.3210.0240.0230.0216.7256.7255.7327.4------
Turbidity (NTU)2.09.87.36.34.413.28.77.48.95.77.25.010.9------
Chlorophyll a (μg/L)6.443.428.226.020.759.830.916.720.713.620.37.14.5------
Total Phosphorus as P (μg/L)26.043.142.837.3376542.436.039.931.931.32415------
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<8<9<1<1------
TKN (mg/L)1.111.011.081.071.241.191.121.070.710.76---------
Total Dissolved Solids (g/L)0.20.20.10.20.20.10.10.20.2----------
Total Nitrogen as N (mg/L)----------1.61.470.79------
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)231.05<0.637.208359<2619<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)16-74425-2<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.66<0.07<0.0700.400.1210<0.4<0.5-0.760.12------
TN:TP ratio----------516863------
pH8.29.08.48.58.78.89.08.58.58.58.18.68.4------
Alkalinity as CaCO3 (mg/L)1029892979487821049987108118150------
Silica as Si (mg/L)-------------------
Dissolved Organic Carbon (mg/L)24.0424.3524.9724.4512.8076.376<7.6<6.476.808.06------
Inorganic Suspended Solids (mg/L)<0.8512<1.43<3.22<55<425------
Volatile Suspended Solids (mg/L)255441074<8<9<834------
Total Suspended Solids (mg/L)21066513106810759------
Carlson Trophic State Index (Secchi)*44656354486358565558514545------
Carlson Trophic State Index (Chl a)*49686363607164586056605045------
Carlson Trophic State Index (TP)*51585856566458565754545043------
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/25/20167/13/20168/24/2016

Contact Limnology Laboratory, Iowa State University