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Report Year: 2016
Cold Springs Lake, Cass County
Summary Data Table
Parameter6/15/20168/2/20169/11/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.24.03.84.03.94.14.03.94.24.24.2--4.44.64.24.24.34.6
Thermocline Depth (m)1.52.23.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.01.10.70.92.10.61.50.70.92.11.5--0.70.60.70.70.50.4
Temperature(oC)28.527.623.426.523.723.023.524.925.225.825.3--25.224.124.525.323.826.8
Dissolved Oxygen (mg/L)10.810.98.19.98.110.810.99.98.78.49.9--10.27.810.713.39.59.0
Dissolved Oxygen Saturation (%)13913895124.295.8124.2127.4120.1109.6104.6121.2--123.293.4128.1162.4106.0112.2
Specific Conductivity (μS/cm)270.0260.0260.0263.3216.7276.7240.0260.0283.3210.0223.3--290.1322.4280.3263.6191.7237.8
Turbidity (NTU)5.03.84.44.45.56.24.713.411.12.63.8--49.424.215.218.849.338.9
Chlorophyll a (μg/L)27.128.839.931.915.967.116.230.142.99.516.0--37.227.224.930.694.157.3
Total Phosphorus as P (μg/L)74.663.172.069.9347439.271.871.439.345.5--53685851143-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<8<9--<1<1<11.0--
TKN (mg/L)0.720.901.090.910.861.900.921.291.26<0.26---------
Total Dissolved Solids (g/L)0.20.20.20.20.10.20.20.20.2----------
Total Nitrogen as N (mg/L)----------0.8--0.911.651.511.002.101.63
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)9.8034.90<0.6131045719419158<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)17-1321650<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.12<0.14<0.06<0.4<0.5---0.220.300.350.250.650.45
TN:TP ratio----------15--1625342015-
pH8.38.68.38.49.08.69.08.88.28.38.7--8.68.28.79.08.97.8
Alkalinity as CaCO3 (mg/L)120113111115861259811011889106--1291488310395112
Silica as Si (mg/L)-------------4.526.546.103.62--
Dissolved Organic Carbon (mg/L)24.3227.9628.6826.9910.3455.196<7.6<6.4<6.2--6.475.0711.8510.89--
Inorganic Suspended Solids (mg/L)311226<3.28<5<4<4--7967119
Volatile Suspended Solids (mg/L)66663852410<9<8--9915103817
Total Suspended Solids (mg/L)878851453112<511--151821174827
Carlson Trophic State Index (Secchi)*6159646149675565624954--646765656973
Carlson Trophic State Index (Chl a)*6364676558725864675358--666362647570
Carlson Trophic State Index (TP)*6664666555665766665759--6165636176-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/15/20168/2/20169/11/2016

Contact Limnology Laboratory, Iowa State University