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Report Year: 2016
Prairie Rose Lake, Shelby County
Summary Data Table
Parameter6/15/20168/2/20169/11/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.36.35.96.26.06.16.1-6.06.26.06.56.46.56.86.76.26.76.1
Thermocline Depth (m)4.23.54.5N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.60.70.71.31.60.92.4-0.60.50.70.60.80.90.51.10.70.70.5
Temperature(oC)25.525.221.123.923.922.324.1-21.024.223.525.325.823.921.324.224.723.325.3
Dissolved Oxygen (mg/L)11.04.45.26.810.29.65.9-6.99.68.910.78.99.18.110.79.68.39.7
Dissolved Oxygen Saturation (%)134535881.7122.1112.270.1-77.2115.7104.9132.0109.1107.691.8128.5114.791.8117.5
Specific Conductivity (μS/cm)320.0300.0310.0310.0303.3383.3456.7-380.0310.0376.7319.6383.6363.8355.9363.9371.4320.1336.8
Turbidity (NTU)4.211.211.99.13.811.44.5-29.623.216.935.022.123.057.718.317.726.831.8
Chlorophyll a (μg/L)11.150.257.939.731.568.311.2-38.154.544.075.849.381.229.221.559.137.023.4
Total Phosphorus as P (μg/L)22.588.887.666.35214088.4-70.481.367.684581121366269119-
SRP as P (μg/L)3.2<2.8<2.8<2.8<4.359.639.6-<11<8<9<1<12.647.72.21.6--
TKN (mg/L)0.701.331.291.100.941.660.88-0.512.62---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.3-0.2----------
Total Nitrogen as N (mg/L)----------1.44.381.491.694.031.651.171.801.52
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)10.85151.3582.9082119108228-245<136182--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)21668143<PRL-<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)2.56<0.07<0.0710.530.381-11-3.830.220.372.720.450.181.010.23
TN:TP ratio----------2284272251331918-
pH8.68.38.28.48.68.57.7-8.08.38.39.08.78.48.68.38.58.28.2
Alkalinity as CaCO3 (mg/L)120123132125123159172-168133163122149145126101141139140
Silica as Si (mg/L)-------------2.818.291.381.92--
Dissolved Organic Carbon (mg/L)22.0228.3733.7228.0412.7665.58-<7.6<6.4<6.23.666.133.794.339.388.31--
Inorganic Suspended Solids (mg/L)1<0.82126<3.2-12<497653474108
Volatile Suspended Solids (mg/L)367554<2.4-910<81479116848
Total Suspended Solids (mg/L)46977103-2014172113144513121416
Carlson Trophic State Index (Secchi)*46666656536248-6971656863626958656670
Carlson Trophic State Index (Chl a)*54697067647254-6670687369746461716662
Carlson Trophic State Index (TP)*49696965617569-65686568637275646573-
*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