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Report Year: 2016
Eldred Sherwood Lake, Hancock County
Summary Data Table
Parameter6/6/20167/25/20169/6/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.05.85.65.85.75.65.65.55.75.85.85.86.06.44.66.26.36.36.3
Thermocline Depth (m)Nil4.21.1N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.31.71.21.41.51.91.40.61.41.31.51.11.71.31.11.80.92.01.1
Temperature(oC)12.220.321.017.822.620.422.624.223.221.322.524.322.525.422.521.922.721.323.0
Dissolved Oxygen (mg/L)7.012.714.411.414.312.911.18.511.516.013.113.010.116.414.016.212.919.814.7
Dissolved Oxygen Saturation (%)65140161122.2164.5143.2129.0101.9135.2181.8151.1155.7116.1200.0161.1182.6149.7220.9173.9
Specific Conductivity (μS/cm)680.0650.0680.0670.0566.7586.7443.3366.7510.0540.0510.0449.2518.7497.7516.2517.3644.9551.4520.8
Turbidity (NTU)3.22.518.58.14.52.59.727.413.22.63.27.525.85.69.98.032.17.312.0
Chlorophyll a (μg/L)13.642.669.641.945.750.927.062.029.138.829.332.721.088.573.716.095.025.09.3
Total Phosphorus as P (μg/L)70.985.2113.689.96279158.8163.148.976.850.21026275161598267-
SRP as P (μg/L)17.4<2.811.210.27.2<5.6101.1<10<11<8<9<1<1<153.01.31.4--
TKN (mg/L)<0.51.391.841.221.462.071.502.511.411.00---------
Total Dissolved Solids (g/L)0.40.40.40.40.40.40.30.20.3----------
Total Nitrogen as N (mg/L)----------10.06.687.0211.2011.9410.849.3112.728.23
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)24.20<0.66.55363876120<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)1-10046<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)13.988.366.761010.0313.2410177-5.525.6710.3011.019.267.7812.176.36
TN:TP ratio----------24813016017381223116189-
pH8.08.08.28.18.38.08.58.88.28.18.18.78.18.88.58.58.68.47.4
Alkalinity as CaCO3 (mg/L)246270316277210236129137174238196180209172187131184185200
Silica as Si (mg/L)-------------9.3610.416.098.52--
Dissolved Organic Carbon (mg/L)45.3049.7572.7455.9321.9466.658<7.6<6.475.164.855.626.707.989.63--
Inorganic Suspended Solids (mg/L)32<0.823<2.1<3.28<5<4<4333873133
Volatile Suspended Solids (mg/L)347527514<8<9<854674794
Total Suspended Solids (mg/L)667668722<68997914910218
Carlson Trophic State Index (Secchi)*56525755545155665557545952575952625058
Carlson Trophic State Index (Chl a)*56677267686963716466646560757358756252
Carlson Trophic State Index (TP)*666872696467777860676171646677636865-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/6/20167/25/20169/6/2016

Contact Limnology Laboratory, Iowa State University