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Report Year: 2016
Spring Lake, Greene County
Summary Data Table
Parameter5/16/20166/27/20168/15/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)1.31.10.91.10.91.11.10.81.21.21.4--1.51.61.61.31.61.3
Thermocline Depth (m)NilNilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.60.40.50.50.50.50.60.30.60.60.6--0.30.40.60.41.10.5
Temperature(oC)14.927.626.222.923.222.322.722.420.622.524.6--23.423.124.527.722.426.7
Dissolved Oxygen (mg/L)9.58.59.99.38.511.09.99.49.18.68.2--7.610.610.49.38.710.9
Dissolved Oxygen Saturation (%)94108123108.399.6126.6113.8108.5101.898.199.6--89.5123.4124.6118.092.8135.0
Specific Conductivity (μS/cm)460.0420.0480.0453.3460.0426.7466.7410.0396.7440.0420.0--502.1436.2526.0584.9494.0463.1
Turbidity (NTU)12.5-12.412.414.013.817.532.523.014.141.2--8.3112.985.131.910.229.1
Chlorophyll a (μg/L)20.831.239.830.633.333.033.873.226.218.122.7--86.570.128.718.716.98.3
Total Phosphorus as P (μg/L)58.3117.849.175.0466048.085.959.742.955.1--7261535754-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<8<9--<1<1<1<1--
TKN (mg/L)1.051.391.311.251.431.511.663.411.134.23---------
Total Dissolved Solids (g/L)0.30.30.30.30.30.30.30.30.3----------
Total Nitrogen as N (mg/L)----------1.2--1.440.981.131.021.071.39
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)16.601.30<0.6<0.6<268221<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)10-3-103<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)3.09<0.07<0.0710.120.12<0.14<0.06<0.4<0.5---0.150.120.120.120.200.35
TN:TP ratio----------22--2017241828-
pH8.48.58.68.58.48.58.68.88.47.88.2--8.48.68.38.38.28.1
Alkalinity as CaCO3 (mg/L)189148135157159138145155169170171--170149126158169159
Silica as Si (mg/L)-------------8.924.377.218.25--
Dissolved Organic Carbon (mg/L)41.5929.8033.3034.9014.4078.5913<7.6<6.46--6.217.7810.2312.46--
Inorganic Suspended Solids (mg/L)211041299817656--1315811510
Volatile Suspended Solids (mg/L)152017171213143012<911--141571569
Total Suspended Solids (mg/L)3630212921212247191317--273115261119
Carlson Trophic State Index (Secchi)*6773697069716875676868--777368745971
Carlson Trophic State Index (Chl a)*6064676465656573635961--747264595851
Carlson Trophic State Index (TP)*6373606659636068635862--6663616362-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/16/20166/27/20168/15/2016

Contact Limnology Laboratory, Iowa State University