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Report Year: 2016
Lake Pahoja, Lyon County
Summary Data Table
Parameter6/1/20167/20/20168/28/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)7.87.26.87.37.57.67.57.57.57.87.7-7.57.88.18.17.98.48.2
Thermocline Depth (m)2.04.95.4N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.44.50.91.92.52.02.20.41.10.71.7-3.71.60.90.91.42.00.6
Temperature(oC)20.424.922.222.521.323.123.023.624.423.322.8-16.722.921.421.524.422.325.1
Dissolved Oxygen (mg/L)10.56.86.98.18.49.08.911.612.89.914.0-10.810.211.910.411.49.911.4
Dissolved Oxygen Saturation (%)116817992.395.1105.1102.2138.1156.3116.1164.7-111.1118.3137.5119.4136.8113.0137.2
Specific Conductivity (μS/cm)690.0670.0620.0660.0530.0483.3580.0543.3603.3600.0593.3-730.3623.6623.9669.0766.4723.5609.9
Turbidity (NTU)0.91.8<0.30.94.37.113.229.516.219.385.5-3.816.828.819.138.029.574.7
Chlorophyll a (μg/L)3.49.422.611.824.741.130.392.768.460.341.0-7.2152.824.522.834.617.080.7
Total Phosphorus as P (μg/L)50.255.8243.4116.4287504789.8299.4158.9262.6113.7-349682825988-
SRP as P (μg/L)6.616.5165.162.7202.8406.1572.699.429.098.820.9-1.22.414.07.51.0--
TKN (mg/L)1.311.111.521.312.001.962.363.211.601.91---------
Total Dissolved Solids (g/L)0.50.40.40.40.30.30.40.40.4----------
Total Nitrogen as N (mg/L)----------2.1-8.553.934.382.344.666.951.69
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)101.7043.004.455024175263<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)91318261149<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)7.592.760.2440.790.520<0.0631--7.613.512.811.103.435.660.17
TN:TP ratio----------19-2494555298879-
pH8.48.98.88.78.78.78.79.38.88.78.9-8.48.68.78.68.78.48.8
Alkalinity as CaCO3 (mg/L)231243247240188203218227250243250-276236211191219174241
Silica as Si (mg/L)-------------2.061.961.331.33--
Dissolved Organic Carbon (mg/L)45.3146.9955.6549.3220.69810.9011<7.6<6.47-5.397.427.4010.629.98--
Inorganic Suspended Solids (mg/L)1<0.8<0.8<0.8<1.4<2.14865<4-3449757
Volatile Suspended Solids (mg/L)3454710823<81213-38877311
Total Suspended Solids (mg/L)44547111131131815-613131615719
Carlson Trophic State Index (Secchi)*7338625147504972596552-41546261555067
Carlson Trophic State Index (Chl a)*4253615562676475727167-50806261655874
Carlson Trophic State Index (TP)*61628373869410086778472-557068686369-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/1/20167/20/20168/28/2016

Contact Limnology Laboratory, Iowa State University