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Report Year: 2016
Lake Manawa, Pottawattamie County
Summary Data Table
Parameter6/14/20168/2/20169/11/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)2.01.92.02.02.02.12.11.92.72.32.32.42.22.22.12.02.02.42.2
Thermocline Depth (m)NilNilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.30.20.30.20.40.40.40.30.60.30.40.40.30.40.40.30.50.50.3
Temperature(oC)27.926.522.325.624.123.423.725.025.224.925.126.226.725.423.826.126.624.326.0
Dissolved Oxygen (mg/L)7.28.86.87.69.210.68.811.98.66.98.39.28.512.410.69.19.310.710.9
Dissolved Oxygen Saturation (%)921097893.0108.8124.5103.2143.5104.782.2100.5113.8106.1151.6125.7110.8115.4130.2134.1
Specific Conductivity (μS/cm)420.0370.0370.0386.7393.3406.7463.3426.7420.0393.3453.3412.4505.7465.7493.8499.0493.1455.8462.1
Turbidity (NTU)44.368.552.355.020.217.018.735.224.920.219.421.625.028.486.657.325.025.840.8
Chlorophyll a (μg/L)48.2125.4132.5102.093.082.768.792.460.249.854.359.263.2115.143.317.958.936.636.9
Total Phosphorus as P (μg/L)157.3197.0189.5181.3123114120.7182.989.1114.394.11081051111021409983-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<8<9<1<1<11.22.52.2--
TKN (mg/L)0.832.061.861.582.032.561.782.61<0.53.55---------
Total Dissolved Solids (g/L)0.30.20.20.30.30.30.30.30.3----------
Total Nitrogen as N (mg/L)----------1.20.501.681.271.381.351.191.211.63
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)356.5097.70125.15193<26<26186<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)31261825-1-313<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.150.220.1800.120.12<0.140<0.4<0.5-0.120.120.120.120.120.120.180.12
TN:TP ratio----------116181213101219-
pH8.18.88.68.58.68.78.58.98.58.38.58.68.68.88.78.68.58.28.1
Alkalinity as CaCO3 (mg/L)150126131136148154169157161153181174195181188136188179182
Silica as Si (mg/L)-------------9.4211.0110.928.89--
Dissolved Organic Carbon (mg/L)27.4229.2431.9429.5313.3054.927<7.6<6.4<6.24.395.453.884.838.386.92--
Inorganic Suspended Solids (mg/L)475038452010817791571424131811915
Volatile Suspended Solids (mg/L)2325222319211837232020201625191216811
Total Suspended Solids (mg/L)70755968403026543129352730493230271727
Carlson Trophic State Index (Secchi)*77877981747474796977727277757576727079
Carlson Trophic State Index (Chl a)*69787976757472757169707171776859716666
Carlson Trophic State Index (TP)*778080797472737969727072717271757068-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/14/20168/2/20169/11/2016

Contact Limnology Laboratory, Iowa State University