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Report Year: 2016
Little River Watershed Lake, Decatur County
Summary Data Table
Parameter5/23/20167/11/20168/22/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)9.59.29.09.29.89.89.5-9.89.79.8--10.310.610.410.711.110.2
Thermocline Depth (m)Nil6.87.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.30.80.60.90.81.61.2-0.40.30.7--1.00.81.21.21.21.1
Temperature(oC)16.123.025.721.621.425.122.0-25.423.823.4--25.123.325.226.022.624.0
Dissolved Oxygen (mg/L)7.01.25.44.59.811.07.0-8.97.57.2--9.28.09.88.27.34.3
Dissolved Oxygen Saturation (%)71146650.5110.8134.379.5-107.588.083.6--112.293.9118.7101.382.551.4
Specific Conductivity (μS/cm)250.0270.0230.0250.0210.0216.7230.0-225.0263.3226.7--244.6258.5253.4400.4215.9255.2
Turbidity (NTU)5.93.810.76.814.19.313.4-36.951.819.2--19.923.815.012.117.914.9
Chlorophyll a (μg/L)4.913.847.722.139.832.34.0-11.817.112.7--101.350.324.919.319.53.5
Total Phosphorus as P (μg/L)44.676.292.271.011377101.1-103.7125.667.3--46141433554-
SRP as P (μg/L)6.811.7<2.86.823.212.352.6-17.041.8<9--<154.91.71.4--
TKN (mg/L)0.650.881.400.981.310.980.93-0.581.52---------
Total Dissolved Solids (g/L)0.20.20.20.20.10.10.2-0.1----------
Total Nitrogen as N (mg/L)----------1.3--1.102.350.941.021.431.72
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)152.15125.15<0.6859744110-<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)25-3133<PRL-<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.50<0.07<0.0700.120.181-11---0.191.190.150.270.510.23
TN:TP ratio----------20--2521223139-
pH7.77.98.58.08.78.67.9-7.97.87.7--8.28.08.48.38.07.1
Alkalinity as CaCO3 (mg/L)991068597879082-867490--105877410290149
Silica as Si (mg/L)-------------2.467.692.041.09--
Dissolved Organic Carbon (mg/L)23.2927.6524.3925.1111.3577.38-<7.6<6.4<6.2--5.046.749.6710.36--
Inorganic Suspended Solids (mg/L)25446<2.14-161211--863456
Volatile Suspended Solids (mg/L)<1495963-<8<9<8--876543
Total Suspended Solids (mg/L)391381577-231714--161399109
Carlson Trophic State Index (Secchi)*57636761645457-757664--616358575758
Carlson Trophic State Index (Chl a)*46566961676544-555856--766962606043
Carlson Trophic State Index (TP)*59676966726771-717465--5976585662-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/23/20167/11/20168/22/2016

Contact Limnology Laboratory, Iowa State University