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Report Year: 2016
Hawthorn Lake (Barnes City Lake), Mahaska County
Summary Data Table
Parameter6/22/20168/8/20169/19/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)7.27.66.77.27.67.97.57.27.3-7.6--8.18.88.68.48.68.2
Thermocline Depth (m)2.93.75.7N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.90.90.80.80.90.81.30.8-0.6--0.90.81.30.91.10.5
Temperature(oC)27.526.422.525.523.422.522.723.323.4-23.3--27.023.224.926.622.825.2
Dissolved Oxygen (mg/L)7.36.96.66.96.89.610.47.98.4-6.8--7.68.88.89.27.77.5
Dissolved Oxygen Saturation (%)92857684.679.7110.8121.892.3100.3-79.6--95.4102.6107.7114.990.091.4
Specific Conductivity (μS/cm)250.0240.0240.0243.3223.3216.7213.3273.3346.7-290.0--327.9310.9287.4440.1241.8265.8
Turbidity (NTU)9.96.111.89.312.79.99.83.516.1-11.3--74.643.612.222.417.5128.2
Chlorophyll a (μg/L)34.439.132.735.439.732.032.313.158.1-17.0--30.028.715.345.735.512.9
Total Phosphorus as P (μg/L)58.057.063.259.4575164.132.162.0-74.2--5644454951-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11-<9--<11.21.01.3--
TKN (mg/L)1.021.100.860.991.141.071.260.661.33----------
Total Dissolved Solids (g/L)0.20.20.20.20.10.10.10.20.2----------
Total Nitrogen as N (mg/L)----------1.3--0.991.261.241.161.831.29
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.62.75<0.63145358<14<145-<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-2-20-120127<PQL<PQL-<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.120<0.06<0.4----0.130.480.310.290.830.12
TN:TP ratio----------19--1829322739-
pH8.58.88.08.48.08.48.58.28.2-8.0--8.28.48.48.08.27.5
Alkalinity as CaCO3 (mg/L)929210596929482114123-112--135114829699172
Silica as Si (mg/L)-------------1.942.491.762.23--
Dissolved Organic Carbon (mg/L)18.9123.2726.9423.0418.3665.675<7.6-<6.2--6.174.019.708.24--
Inorganic Suspended Solids (mg/L)432333<3.2<25-11--475568
Volatile Suspended Solids (mg/L)7867748<3.2<8-<8--564956
Total Suspended Solids (mg/L)111091010810413-15--101310141014
Carlson Trophic State Index (Secchi)*666262646461645663-67--626356625969
Carlson Trophic State Index (Chl a)*656765666765655670-58--646457686656
Carlson Trophic State Index (TP)*636264636261645464-66--6259596061-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/22/20168/8/20169/19/2016

Contact Limnology Laboratory, Iowa State University