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Report Year: 2016
Silver Lake (Worth), Worth County
Summary Data Table
Parameter6/8/20167/27/20169/5/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)1.81.91.71.81.81.81.3-1.81.71.81.61.71.62.21.91.41.92.0
Thermocline Depth (m)NilNilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.70.60.60.91.11.81.3-0.20.20.30.20.30.30.20.50.20.50.3
Temperature(oC)20.225.321.622.423.721.824.2-25.322.323.824.020.525.123.922.924.724.323.8
Dissolved Oxygen (mg/L)8.42.88.46.58.48.44.4-11.69.39.513.613.29.210.410.29.613.311.6
Dissolved Oxygen Saturation (%)92349573.899.396.451.9-141.9106.5111.8161.3146.0111.7123.5119.8117.6161.4137.7
Specific Conductivity (μS/cm)380.0260.0260.0300.0283.3280.0405.0-226.7236.7256.7244.9267.6308.0254.3315.7339.7238.1271.2
Turbidity (NTU)10.723.911.715.46.81.92.7-68.934.030.7125.868.943.1237.346.087.351.186.0
Chlorophyll a (μg/L)8.063.594.755.466.15.261.3-85.760.851.7107.779.5285.4101.519.964.032.869.0
Total Phosphorus as P (μg/L)88.6131.5150.5123.5199206568.7-209.8195.5138.7237157177186182198122-
SRP as P (μg/L)20.9<2.8<2.86.943.7172.2494.4-<11<8<9<1<1<12.640.6<1--
TKN (mg/L)1.182.562.442.061.911.321.91-2.894.34---------
Total Dissolved Solids (g/L)0.30.20.20.20.20.20.3-0.1----------
Total Nitrogen as N (mg/L)----------2.61.962.171.242.443.581.981.562.22
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)18.90202.9540.408762<26252-<145170<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)21647211<PRL-<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.12<0.14-<0.4<0.5-0.220.120.210.270.420.230.170.31
TN:TP ratio----------191014613201114-
pH8.48.28.48.38.68.67.6-9.19.08.69.49.38.89.38.58.99.38.4
Alkalinity as CaCO3 (mg/L)166105123131131135180-10310411312412312910710012097122
Silica as Si (mg/L)-------------5.226.524.487.38--
Dissolved Organic Carbon (mg/L)35.8231.9536.1934.6526.46710.44-9101418.8419.3717.4519.1419.2022.16--
Inorganic Suspended Solids (mg/L)<0.8<0.8423<2.1<3.2-191510251932131391318
Volatile Suspended Solids (mg/L)311191112<2.13-5542234541413521311347
Total Suspended Solids (mg/L)31223131435-7557347961724835293465
Carlson Trophic State Index (Secchi)*53686861595156-8281778578808369816979
Carlson Trophic State Index (Chl a)*51717570724771-7471697774867660716572
Carlson Trophic State Index (TP)*69757674808196-81807583777980798073-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/8/20167/27/20169/5/2016

Contact Limnology Laboratory, Iowa State University