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Report Year: 2016
Rodgers Park Lake, Benton County
Summary Data Table
Parameter6/7/20167/25/20169/8/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.24.24.04.14.24.24.24.04.14.44.4--4.64.54.44.54.64.4
Thermocline Depth (m)3.02.71.8N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.91.10.11.03.02.30.60.71.93.43.0--2.11.92.11.41.11.0
Temperature(oC)22.327.623.924.624.822.822.924.926.123.425.5--26.924.124.725.923.825.5
Dissolved Oxygen (mg/L)11.66.23.77.211.87.55.813.310.99.38.4--8.912.310.910.87.011.8
Dissolved Oxygen Saturation (%)134784385.2141.887.067.0162.1135.2108.8102.3--112.3147.1133.3134.585.3144.6
Specific Conductivity (μS/cm)420.0430.0430.0426.7416.7403.3406.7353.3430.0486.7460.0--427.0589.1444.3461.3352.5427.3
Turbidity (NTU)1.54.414.36.71.23.330.615.821.23.12.7--34.619.08.450.135.639.1
Chlorophyll a (μg/L)15.752.841.036.513.324.09.1112.121.85.4<5--67.232.413.226.63.415.7
Total Phosphorus as P (μg/L)28.773.7102.968.42376177.3273.775.642.177.2--927794197126-
SRP as P (μg/L)<2.8<2.86.6<2.8<4.329.278.684.713.1<838.5--5.67.427.299.7--
TKN (mg/L)0.921.241.321.160.631.551.112.191.051.33---------
Total Dissolved Solids (g/L)0.30.30.30.30.30.30.30.20.3----------
Total Nitrogen as N (mg/L)----------6.1--3.258.023.833.239.095.56
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)412.05<0.684.35162<26166188172<145171141--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)23-15938<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)4.813.862.4344.962.265033---2.317.212.872.356.904.10
TN:TP ratio----------105--541364668140-
pH8.18.38.18.18.58.27.78.68.17.97.9--8.38.38.38.37.77.4
Alkalinity as CaCO3 (mg/L)143170176163141148141136162186167--139170110155141148
Silica as Si (mg/L)-------------4.145.403.056.41--
Dissolved Organic Carbon (mg/L)27.8827.8739.9931.9112.9443.946<7.6<6.4<6.2--4.592.997.1710.23--
Inorganic Suspended Solids (mg/L)<0.8633<1.4<2.119<2<5<4<4--5642124
Volatile Suspended Solids (mg/L)565523613<8<9<8--1155457
Total Suspended Solids (mg/L)61289352515<6<56--1410771811
Carlson Trophic State Index (Secchi)*5159936044486765514344--505149555960
Carlson Trophic State Index (Chl a)*5870676656625277614745--726556634358
Carlson Trophic State Index (TP)*5366716549677985675867--6967708074-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/7/20167/25/20169/8/2016

Contact Limnology Laboratory, Iowa State University