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Report Year: 2016
South Prairie Lake, Black Hawk County
Summary Data Table
Parameter6/6/20167/25/20169/7/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.16.05.15.75.55.25.45.35.06.16.2--6.56.15.24.95.64.9
Thermocline Depth (m)3.22.41.7N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)3.40.71.11.71.01.70.61.31.61.62.4--0.90.72.42.51.80.8
Temperature(oC)22.927.524.625.024.923.124.324.124.523.725.0--26.023.623.924.924.123.7
Dissolved Oxygen (mg/L)10.012.08.110.010.69.210.59.29.110.58.7--13.310.010.69.47.27.4
Dissolved Oxygen Saturation (%)11715297121.7128.2106.7128.0108.9110.6124.0105.8--164.7118.6126.2113.192.087.4
Specific Conductivity (μS/cm)710.0630.0650.0663.3576.7480.0396.7600.0503.3440.0450.0--351.0432.5437.4442.4348.2316.5
Turbidity (NTU)0.414.96.67.313.98.853.813.916.111.01.7--62.726.830.58.66.927.0
Chlorophyll a (μg/L)2.5105.946.151.581.950.118.538.634.031.110.7--140.954.413.96.75.08.3
Total Phosphorus as P (μg/L)18.5123.2302.9148.286157163.7178.891.1114.439.6--103142253419-
SRP as P (μg/L)<2.86.6154.052.3<4.359.468.270.714.320.7<9--1.536.61.4<1--
TKN (mg/L)0.521.841.721.361.541.771.301.833.171.85---------
Total Dissolved Solids (g/L)0.50.40.40.40.40.30.30.40.3----------
Total Nitrogen as N (mg/L)----------0.8--1.141.470.740.600.621.23
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)7.35<0.6<0.6<0.6<26<2681<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)1-130-4-30<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.121<0.06<0.4<0.5---0.150.490.150.150.170.12
TN:TP ratio----------23--1310301939-
pH8.39.38.38.68.98.78.98.68.28.38.2--9.38.98.48.48.17.7
Alkalinity as CaCO3 (mg/L)877610088769774979993105--999479107123133
Silica as Si (mg/L)-------------3.633.191.481.32--
Dissolved Organic Carbon (mg/L)20.0117.2426.9221.3911.9065.627<7.6<6.4<6.2--7.955.077.197.37--
Inorganic Suspended Solids (mg/L)<0.83<0.813212<2<5<4<4--363354
Volatile Suspended Solids (mg/L)3115699108<8<9<8--11112344
Total Suspended Solids (mg/L)41458121122979<5--14174678
Carlson Trophic State Index (Secchi)*4265585260526756535348--616648475164
Carlson Trophic State Index (Chl a)*3976686974695966656454--797056494651
Carlson Trophic State Index (TP)*4674877668777879697257--7176515547-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/6/20167/25/20169/7/2016

Contact Limnology Laboratory, Iowa State University