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Report Year: 2016
Indian Lake, Van Buren County
Summary Data Table
Parameter5/25/20167/12/20168/23/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)2.32.22.22.22.42.42.42.22.42.52.5--2.52.72.72.42.72.7
Thermocline Depth (m)1.9NilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.30.40.30.60.90.80.40.41.00.50.5--0.80.50.30.81.30.6
Temperature(oC)23.128.026.025.726.025.526.326.726.527.224.7--29.025.624.330.025.727.0
Dissolved Oxygen (mg/L)9.110.111.610.312.613.59.610.75.98.16.9--14.410.57.210.912.712.6
Dissolved Oxygen Saturation (%)106130143126.0157.8164.9119.8134.672.6102.383.2--189.5130.485.8147.4159.8158.7
Specific Conductivity (μS/cm)350.0290.0190.0276.7260.0263.3260.0253.3263.3263.3253.3--352.6269.6206.9280.9254.3298.3
Turbidity (NTU)4.419.756.526.917.017.510.912.68.58.725.8--64.341.156.032.640.426.5
Chlorophyll a (μg/L)19.079.7204.2100.949.265.758.389.719.619.754.3--306.984.515.9111.287.416.7
Total Phosphorus as P (μg/L)46.3114.5198.8119.9107186180.1143.4127.2104.7240.0--215192213166141-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.340.1<14<10<11<841.9--30.638.943.212.2--
TKN (mg/L)1.071.812.961.951.391.721.752.090.950.79---------
Total Dissolved Solids (g/L)0.20.20.10.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------2.0--1.372.381.851.471.911.61
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)204.95<0.6<0.660<268419<14<145<136557--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)7-1-80-329<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.12<0.14<0.06<0.4<0.5---0.130.120.130.120.120.12
TN:TP ratio----------8--111291124-
pH7.98.49.08.48.68.68.58.57.98.08.0--8.98.88.39.18.57.3
Alkalinity as CaCO3 (mg/L)131927599104101991031099798--122117649595158
Silica as Si (mg/L)-------------5.068.227.917.16--
Dissolved Organic Carbon (mg/L)28.2824.9822.2325.1614.4777.088<7.6<6.4<6.2--8.507.6913.4213.12--
Inorganic Suspended Solids (mg/L)357553476<46--5311455
Volatile Suspended Solids (mg/L)612261512141414<8<915--3912131065
Total Suspended Solids (mg/L)817321917171822111120--301524121010
Carlson Trophic State Index (Secchi)*5675796662637274607071--637176635668
Carlson Trophic State Index (Chl a)*5974837669727075606070--877458777458
Carlson Trophic State Index (TP)*5973807371807976747183--8280817876-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/25/20167/12/20168/23/2016

Contact Limnology Laboratory, Iowa State University