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Report Year: 2016
Five Island Lake, Palo Alto County
Summary Data Table
Parameter5/31/20167/18/20168/30/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)5.25.54.45.15.45.35.55.85.56.05.85.95.66.26.36.05.25.95.4
Thermocline Depth (m)4.0Nil2.4N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.20.30.50.70.60.60.70.40.40.40.50.40.50.60.70.50.61.40.8
Temperature(oC)22.024.324.023.421.022.922.023.923.923.221.923.724.224.622.621.923.323.224.8
Dissolved Oxygen (mg/L)8.68.010.28.99.78.58.16.49.98.17.37.48.99.99.79.68.38.88.4
Dissolved Oxygen Saturation (%)9896121105.1108.598.992.475.2117.294.783.587.5106.5121.4112.6110.897.0103.4101.0
Specific Conductivity (μS/cm)560.0440.0380.0460.0453.3426.7400.0410.0390.0396.7436.7464.7498.8478.2452.0470.7476.5444.3418.8
Turbidity (NTU)6.634.330.423.824.425.526.437.125.419.222.741.255.228.232.429.730.235.214.7
Chlorophyll a (μg/L)10.546.948.135.238.245.244.269.4110.262.520.738.034.095.545.430.832.017.423.3
Total Phosphorus as P (μg/L)32.1105.086.074.483108106.5114.789.079.395.61256710476699479-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.312.214.6<10<11<8<9<1<1<11.22.63.3--
TKN (mg/L)1.221.331.191.251.551.422.182.522.261.42---------
Total Dissolved Solids (g/L)0.40.30.30.30.30.30.30.30.3----------
Total Nitrogen as N (mg/L)----------1.22.392.504.194.322.851.792.661.58
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)175.80<0.6<0.6461045233650<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)90-12-1127<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)7.991.51<0.0731.590.232022-1.161.052.632.311.610.491.520.28
TN:TP ratio----------1323364454401963-
pH8.18.68.98.58.58.48.48.38.58.38.38.48.48.48.68.58.38.28.2
Alkalinity as CaCO3 (mg/L)186153125155144154134158161138165173190183140126163135180
Silica as Si (mg/L)-------------3.553.232.353.25--
Dissolved Organic Carbon (mg/L)38.1534.7030.3434.4016.0077.078<7.6<6.4820.145.906.7023.1412.2214.12--
Inorganic Suspended Solids (mg/L)4<0.8741198101511132512151115171012
Volatile Suspended Solids (mg/L)4616912111416913102111151310978
Total Suspended Solids (mg/L)862312242022252424234623302324261620
Carlson Trophic State Index (Secchi)*57807066686865727273707369696670695663
Carlson Trophic State Index (Chl a)*54686966666868727771606665756864655961
Carlson Trophic State Index (TP)*547168666872717369677074657167657067-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/31/20167/18/20168/30/2016

Contact Limnology Laboratory, Iowa State University