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Report Year: 2016
Meyers Lake, Black Hawk County
Summary Data Table
Parameter6/6/20167/25/20169/8/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)5.85.85.55.75.85.75.95.55.76.16.1--5.76.25.95.95.85.7
Thermocline Depth (m)Nil1.03.2N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.50.50.50.30.40.60.50.61.40.5--0.50.90.72.60.90.6
Temperature(oC)24.128.125.025.725.323.225.221.525.024.527.5--26.524.824.425.623.524.7
Dissolved Oxygen (mg/L)6.18.88.47.811.510.412.310.99.811.811.0--9.110.013.27.97.99.1
Dissolved Oxygen Saturation (%)7311310195.6139.8121.3147.2123.4120.6141.4139.8--113.5121.7157.596.398.9109.8
Specific Conductivity (μS/cm)540.0450.0440.0476.7446.7513.3500.0470.0533.3520.0413.3--401.7527.9369.8447.5350.6388.8
Turbidity (NTU)23.99.1<0.311.032.119.414.226.142.16.217.1--28.812.126.116.116.783.2
Chlorophyll a (μg/L)39.260.971.757.388.060.534.354.461.717.358.7--137.830.824.84.915.814.7
Total Phosphorus as P (μg/L)124.8112.5140.5125.919413293.2110.0135.7114.2167.0--14491134101135-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.6<14<10<11<814.7--14.84.92.534.6--
TKN (mg/L)1.171.381.581.382.552.461.701.913.00<0.26---------
Total Dissolved Solids (g/L)0.40.30.30.30.30.30.30.30.4----------
Total Nitrogen as N (mg/L)----------1.8--1.701.001.600.861.801.33
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)47.15<0.6<0.63<26<2610421284<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)4-4-1-1-31<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.120<0.06<0.4<0.5---0.130.120.120.140.120.14
TN:TP ratio----------12--1211121417-
pH8.28.48.48.39.08.38.38.48.48.28.7--8.48.48.78.77.87.2
Alkalinity as CaCO3 (mg/L)1328611311085106112979814394--9511360919699
Silica as Si (mg/L)-------------5.052.482.852.35--
Dissolved Organic Carbon (mg/L)28.4721.5928.1826.0812.5045.958<7.6<6.46--8.186.4710.2310.67--
Inorganic Suspended Solids (mg/L)414474455<56<4--133444
Volatile Suspended Solids (mg/L)81311112314111413<915--14694610
Total Suspended Solids (mg/L)1227151828181619161118--1591271114
Carlson Trophic State Index (Secchi)*6672716976726970675569--706266466266
Carlson Trophic State Index (Chl a)*6771737075716570715971--796462465857
Carlson Trophic State Index (TP)*7472757480757072757278--7669757175-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/6/20167/25/20169/8/2016

Contact Limnology Laboratory, Iowa State University