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Report Year: 2016
West Lake (Osceola), Clarke County
Summary Data Table
Parameter5/23/20167/11/20168/21/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)8.88.38.28.48.38.68.58.28.58.58.3--8.68.57.98.39.38.1
Thermocline Depth (m)4.54.25.2N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.71.10.80.90.80.80.50.80.80.40.9--0.81.21.21.01.40.9
Temperature(oC)18.927.525.323.923.124.623.824.024.825.724.6--26.823.223.725.323.625.3
Dissolved Oxygen (mg/L)11.210.65.08.910.59.911.77.311.711.97.8--8.08.26.05.68.711.0
Dissolved Oxygen Saturation (%)12013461105.1122.4119.7139.186.7141.3145.194.6--99.796.969.867.4101.3133.8
Specific Conductivity (μS/cm)240.0250.0200.0230.0216.7213.3220.0236.7203.3256.7240.0--276.7284.7289.5465.0236.5252.6
Turbidity (NTU)8.27.97.27.89.59.927.310.613.917.19.3--15.18.738.67.28.19.3
Chlorophyll a (μg/L)20.739.018.025.928.360.061.235.833.848.416.0--43.414.218.322.317.317.3
Total Phosphorus as P (μg/L)68.385.568.674.1121137164.8120.4116.4141.0119.6--6688847890-
SRP as P (μg/L)<2.8<2.8<2.8<2.822.228.737.566.518.217.424.5--2.434.514.58.4--
TKN (mg/L)0.751.161.000.971.241.231.911.491.861.69---------
Total Dissolved Solids (g/L)0.20.20.10.20.10.10.10.20.1----------
Total Nitrogen as N (mg/L)----------1.8--1.291.321.441.162.021.42
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.656.351511738119105<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)0-312362<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.97<0.07<0.0700.320.18101<0.5---0.310.440.390.290.880.24
TN:TP ratio----------17--2015191731-
pH8.18.98.78.68.48.48.88.18.88.88.3--8.28.28.08.07.87.7
Alkalinity as CaCO3 (mg/L)981048495959287988483101--1221168312491156
Silica as Si (mg/L)-------------2.093.042.301.68--
Dissolved Organic Carbon (mg/L)22.3824.9824.2323.8613.8686.867<7.666--9.146.7112.0711.65--
Inorganic Suspended Solids (mg/L)532345<3.24<586--235483
Volatile Suspended Solids (mg/L)476668117<8<9<8--845533
Total Suspended Solids (mg/L)9108911131411101510--107108116
Carlson Trophic State Index (Secchi)*6659636264647064647362--635757605561
Carlson Trophic State Index (Chl a)*6067596363717166656958--685759615959
Carlson Trophic State Index (TP)*6568656673757873737673--6569686769-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/23/20167/11/20168/21/2016

Contact Limnology Laboratory, Iowa State University