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Report Year: 2016
Silver Lake (Palo Alto), Palo Alto County
Summary Data Table
Parameter5/31/20167/18/20168/28/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)1.51.70.81.31.71.81.71.51.81.71.71.61.71.81.91.81.82.01.8
Thermocline Depth (m)Nil1.00.3N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.40.30.20.30.60.50.70.20.30.50.70.30.30.40.40.30.20.30.3
Temperature(oC)21.826.124.224.021.522.821.724.123.423.922.423.524.223.622.420.923.223.424.0
Dissolved Oxygen (mg/L)8.112.315.612.011.59.78.18.19.610.39.69.211.210.29.010.38.17.711.5
Dissolved Oxygen Saturation (%)92152186143.2131.8112.290.795.1113.7122.0111.4108.5132.8120.7104.6116.694.288.8137.4
Specific Conductivity (μS/cm)420.0350.0270.0346.7445.0366.7460.0403.3380.0360.0426.7475.7427.2391.4406.5446.1491.9509.3377.8
Turbidity (NTU)32.76.466.635.216.631.732.698.386.139.734.6138.358.181.885.459.389.3285.687.8
Chlorophyll a (μg/L)42.456.5217.9105.649.867.633.8126.956.2100.731.729.887.0170.594.028.2145.167.1116.2
Total Phosphorus as P (μg/L)162.7173.6284.7207.0126224218.2421.8145.2113.6131.3169161136159107274282-
SRP as P (μg/L)<2.812.4<2.83.910.1119.6123.0252.512.0<837.351.51.513.74.714.377.5--
TKN (mg/L)2.191.382.291.951.922.171.843.790.691.13---------
Total Dissolved Solids (g/L)0.30.20.20.20.30.20.30.30.2----------
Total Nitrogen as N (mg/L)----------1.62.921.911.882.722.972.114.492.15
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.62183367140<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-1-5-14-63638<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)1.64<0.07<0.0712.301.151021-2.220.260.761.111.800.292.730.20
TN:TP ratio----------122417222129918-
pH8.29.49.49.08.78.78.28.78.38.78.78.58.48.38.68.78.48.28.5
Alkalinity as CaCO3 (mg/L)155136111134167152175171166142181189179148152121186172149
Silica as Si (mg/L)-------------4.355.308.4811.08--
Dissolved Organic Carbon (mg/L)30.4427.8926.7928.375.6765.978<7.6<6.475.175.315.576.559.3914.59--
Inorganic Suspended Solids (mg/L)2113231911121839411892236243618365847
Volatile Suspended Solids (mg/L)17182621101411272322131317131812221625
Total Suspended Solids (mg/L)39304939212629656439223553375430595271
Carlson Trophic State Index (Secchi)*75778178676965837770657779737477828080
Carlson Trophic State Index (Chl a)*67708376697265787076646474817563797277
Carlson Trophic State Index (TP)*787986817482829176727478777577718586-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/31/20167/18/20168/28/2016

Contact Limnology Laboratory, Iowa State University