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Report Year: 2016
Roberts Creek Lake, Marion County
Summary Data Table
Parameter6/22/20168/8/20169/19/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)5.65.35.45.47.06.36.95.47.910.25.9--6.07.36.15.99.16.2
Thermocline Depth (m)3.5NilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.50.40.50.70.60.50.40.50.90.7--0.60.70.60.51.50.6
Temperature(oC)25.625.921.724.423.522.822.623.521.623.223.1--25.823.025.527.522.025.3
Dissolved Oxygen (mg/L)3.96.17.35.85.87.88.25.36.93.56.9--9.28.911.110.27.77.9
Dissolved Oxygen Saturation (%)47758268.469.391.396.261.779.841.281.6--114.1103.2136.3129.688.195.4
Specific Conductivity (μS/cm)470.0370.0350.0396.7423.3380.0453.3393.3393.3390.0416.7--452.3452.3441.2423.5439.4426.9
Turbidity (NTU)10.110.427.315.918.513.919.725.030.916.514.8--111.040.822.522.211.627.0
Chlorophyll a (μg/L)30.973.478.460.925.728.532.946.920.710.67.3--69.025.937.635.919.810.1
Total Phosphorus as P (μg/L)83.6114.9167.3121.99492108.2141.6110.692.764.2--909310789125-
SRP as P (μg/L)<2.8<2.8<2.8<2.824.429.6<1410.220.918.4<9--1.626.14.14.2--
TKN (mg/L)1.311.141.201.221.190.881.481.261.150.61---------
Total Dissolved Solids (g/L)0.30.20.20.30.30.20.30.30.3----------
Total Nitrogen as N (mg/L)----------2.6--2.544.042.691.435.021.56
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)261.70<0.6<0.681927217673186<136135--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)180-2555<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)2.19<0.070.0913.131.264012---2.092.861.410.534.060.30
TN:TP ratio----------39--3043281940-
pH8.18.48.58.38.18.18.07.77.87.48.0--8.38.38.68.27.77.7
Alkalinity as CaCO3 (mg/L)13793106112136119134106136138125--12114885117147152
Silica as Si (mg/L)-------------3.585.732.863.10--
Dissolved Organic Carbon (mg/L)25.2523.2726.0924.8724.5154.905<7.6<6.4<6.2--5.108.348.589.78--
Inorganic Suspended Solids (mg/L)9712910101216181011--912116611
Volatile Suspended Solids (mg/L)1381010658109<9<8--468935
Total Suspended Solids (mg/L)2215222016152026271513--13181915916
Carlson Trophic State Index (Secchi)*6570746964676974706164--676668705569
Carlson Trophic State Index (Chl a)*6473737162636568605450--726366666053
Carlson Trophic State Index (TP)*6873787370697276726964--6970726974-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/22/20168/8/20169/19/2016

Contact Limnology Laboratory, Iowa State University