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Report Year: 2016
Don Williams Lake, Boone County
Summary Data Table
Parameter5/16/20166/27/20168/15/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)11.311.210.811.111.411.311.610.910.511.711.212.112.312.212.712.613.012.312.1
Thermocline Depth (m)6.25.05.5N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.32.00.21.20.70.61.11.00.80.81.10.92.33.11.11.52.52.20.6
Temperature(oC)12.125.825.421.121.019.519.722.720.520.422.424.023.023.520.522.424.321.526.2
Dissolved Oxygen (mg/L)12.011.69.210.912.99.614.38.811.99.18.512.110.07.911.612.98.611.411.2
Dissolved Oxygen Saturation (%)111142112121.8144.1106.4155.099.3131.3100.098.3143.4116.594.0130.9140.4102.2144.8138.8
Specific Conductivity (μS/cm)670.0570.0520.0586.7636.7433.3540.0436.7516.7480.0546.7516.8626.1622.4546.4615.2527.8507.7374.3
Turbidity (NTU)4.8-15.810.38.011.36.23.18.39.84.119.56.423.812.914.14.98.611.1
Chlorophyll a (μg/L)33.715.5158.469.245.825.530.932.031.638.123.320.523.222.817.825.211.912.735.0
Total Phosphorus as P (μg/L)58.431.886.158.75821596.055.856.3219.251.09729321275151124-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3151.946.0<10<11133.3<968.8<12.532.2<117.0--
TKN (mg/L)0.620.652.451.241.241.220.971.801.11<0.5---------
Total Dissolved Solids (g/L)0.40.40.30.40.40.30.40.30.3----------
Total Nitrogen as N (mg/L)----------7.69.5710.817.6611.4413.3811.4016.753.46
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)4.3035.95<0.68<261602090<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)04-6013<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)10.838.982.03713.369.1415367-9.1010.166.9311.0712.2610.0214.322.21
TN:TP ratio----------152139439278145305332197-
pH8.48.39.08.58.37.98.58.38.27.58.08.38.48.38.48.38.38.37.9
Alkalinity as CaCO3 (mg/L)256202123194212135154158224193230188211217179142164153148
Silica as Si (mg/L)-------------5.888.894.724.87--
Dissolved Organic Carbon (mg/L)58.1235.6828.0140.6015.9454.345<7.6<6.4<6.24.003.872.923.966.806.57--
Inorganic Suspended Solids (mg/L)54106146<3.25<575107378475
Volatile Suspended Solids (mg/L)931597554<8<9<877335845
Total Suspended Solids (mg/L)148241520119810111216147101391210
Carlson Trophic State Index (Secchi)*56508158656758606463596148445955474967
Carlson Trophic State Index (Chl a)*65588072686264656466626061615962555665
Carlson Trophic State Index (TP)*635468636382706262826170535474616174-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/16/20166/27/20168/15/2016

Contact Limnology Laboratory, Iowa State University