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Report Year: 2016
Williamson Pond, Lucas County
Summary Data Table
Parameter5/23/20167/13/20168/21/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.13.94.04.04.04.04.03.74.14.14.2--4.54.64.54.7-4.7
Thermocline Depth (m)2.82.52.7N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.30.50.60.80.50.40.40.50.80.30.6--0.60.61.40.5-0.5
Temperature(oC)20.627.425.224.422.123.825.624.124.925.125.7--26.223.724.726.7-23.9
Dissolved Oxygen (mg/L)12.39.03.28.19.86.214.79.47.29.79.1--9.312.19.08.8-9.6
Dissolved Oxygen Saturation (%)1361133996.2111.573.5179.5113.186.8117.9113.5--114.4144.3110.6111.4-115.9
Specific Conductivity (μS/cm)290.0250.0200.0246.7220.0190.0210.0253.3296.7170.0243.3--261.0249.0259.9270.9-147.6
Turbidity (NTU)7.412.412.610.827.846.237.421.114.229.822.4--59.440.737.131.5-99.0
Chlorophyll a (μg/L)20.733.036.029.932.331.089.563.522.840.726.7--224.533.418.328.3-9.9
Total Phosphorus as P (μg/L)71.8171.3325.8189.6164287259.5293.6174.4211.4220.8--262159207160--
SRP as P (μg/L)<2.848.7179.175.550.4157.614.8161.157.785.083.1--94.355.549.241.6--
TKN (mg/L)0.881.111.561.191.091.162.161.911.521.68---------
Total Dissolved Solids (g/L)0.20.20.10.20.10.10.10.20.2----------
Total Nitrogen as N (mg/L)----------2.9--2.433.261.862.23-2.26
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)15.507.95232.858534232<1060<145<136185--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)22321226<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.79<0.07<0.0700.550.510111---1.031.770.311.22-0.27
TN:TP ratio----------15--23211313--
pH8.48.68.48.58.17.89.28.57.87.88.2--9.08.48.38.3-7.3
Alkalinity as CaCO3 (mg/L)115106821018876891119966102--97987994-127
Silica as Si (mg/L)-------------7.378.125.675.22--
Dissolved Organic Carbon (mg/L)24.8326.1323.3524.7710.3466.858<7.6<6.48--10.989.2913.2713.11--
Inorganic Suspended Solids (mg/L)56551112129<5138--152094-13
Volatile Suspended Solids (mg/L)588766159<8<913--268138-4
Total Suspended Solids (mg/L)1014131216182718112021--42292212-17
Carlson Trophic State Index (Secchi)*5670676369747369637667--67675669-69
Carlson Trophic State Index (Chl a)*6065666465647571616763--84655963-53
Carlson Trophic State Index (TP)*6678888078868486798182--84778177--
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/23/20167/13/20168/21/2016

Contact Limnology Laboratory, Iowa State University