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Report Year: 2016
Windmill Lake, Taylor County
Summary Data Table
Parameter6/15/20168/2/20169/11/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)3.83.53.83.74.04.04.03.54.24.54.5--5.05.05.05.05.04.9
Thermocline Depth (m)2.7NilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.20.40.40.30.30.50.40.30.30.4--0.90.71.11.10.60.4
Temperature(oC)27.825.123.225.423.622.523.024.325.224.624.2--24.622.924.426.224.126.2
Dissolved Oxygen (mg/L)9.55.76.67.36.27.67.98.39.36.77.0--10.07.010.88.57.09.9
Dissolved Oxygen Saturation (%)121697789.173.589.192.598.8113.679.882.8--120.181.2130.5104.981.4122.6
Specific Conductivity (μS/cm)280.0190.0190.0220.0196.7263.3273.3243.3243.3230.0243.3--270.1292.5278.9220.4190.2194.1
Turbidity (NTU)16.160.839.338.740.533.431.528.445.335.939.0--52.6128.4118.725.638.744.4
Chlorophyll a (μg/L)25.863.027.838.835.936.432.558.349.739.228.3--196.626.620.4131.065.739.5
Total Phosphorus as P (μg/L)58.8152.4124.4111.91239968.1107.291.2102.789.5--10210394113162-
SRP as P (μg/L)<2.85.110.76.118.59.8<14<10<11<8<9--6.915.92.010.2--
TKN (mg/L)0.851.681.211.251.371.631.471.881.43<0.26---------
Total Dissolved Solids (g/L)0.20.10.10.10.10.20.20.20.2----------
Total Nitrogen as N (mg/L)----------1.5--1.251.421.141.941.552.07
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6149.454887221152269148152208--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-108347<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.07<0.07<0.07<0.070.240.2310<0.4<0.5---0.170.160.120.160.330.12
TN:TP ratio----------17--1214151710-
pH8.38.48.18.38.18.08.28.28.38.08.0--8.68.28.48.38.28.0
Alkalinity as CaCO3 (mg/L)1248281968810511110110296106--12712892917994
Silica as Si (mg/L)-------------3.115.063.793.68--
Dissolved Organic Carbon (mg/L)25.1523.1025.3224.5217.8276.648<7.677--5.697.2211.6311.05--
Inorganic Suspended Solids (mg/L)1124201825251615251522--138471010
Volatile Suspended Solids (mg/L)818912613610131111--1167141212
Total Suspended Solids (mg/L)1843293031372226372634--251411152222
Carlson Trophic State Index (Secchi)*6681747276777073767873--626658586772
Carlson Trophic State Index (Chl a)*6271636666666570696763--826360787267
Carlson Trophic State Index (TP)*6377747274706572697169--7171707278-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/15/20168/2/20169/11/2016

Contact Limnology Laboratory, Iowa State University