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Report Year: 2016
Beaver Lake, Dallas County
Summary Data Table
Parameter6/13/20168/1/20169/13/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)10.98.77.89.110.511.110.49.010.511.511.5--12.412.612.512.513.212.5
Thermocline Depth (m)3.94.95.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.40.30.51.10.60.50.40.60.40.7--0.60.62.01.21.90.9
Temperature(oC)24.724.422.523.923.420.722.624.223.724.722.5--23.822.222.223.924.625.2
Dissolved Oxygen (mg/L)6.14.35.85.46.19.110.37.57.912.08.3--11.812.17.79.77.87.7
Dissolved Oxygen Saturation (%)73516763.672.2101.7118.788.894.4145.696.1--138.6141.486.1114.694.893.1
Specific Conductivity (μS/cm)290.0290.0300.0293.3270.0306.7256.7263.3266.7243.3283.3--262.6278.8311.2287.0314.8349.9
Turbidity (NTU)3.523.736.021.113.216.066.136.324.741.611.3--34.448.211.413.36.011.8
Chlorophyll a (μg/L)57.371.7121.883.679.563.969.7129.480.689.541.7--104.175.318.136.511.623.9
Total Phosphorus as P (μg/L)67.7482.0524.3358.0125157150.5201.5161.5204.8100.6--93112826664-
SRP as P (μg/L)<2.8324.2272.5198.315.432.8<1433.1<11<8<9--1.116.2<16.1--
TKN (mg/L)0.571.842.711.701.732.262.072.952.332.00---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------1.7--2.703.442.211.511.881.33
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.6<26174<10<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-20-5-2710<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)1.02<0.07<0.0700.851.2610<0.41---1.422.251.140.361.080.14
TN:TP ratio----------19--3833332532-
pH8.89.18.98.98.88.29.38.88.68.88.7--9.08.98.68.88.27.6
Alkalinity as CaCO3 (mg/L)10311111811110710982108103103133--10611984112128155
Silica as Si (mg/L)-------------3.275.242.412.46--
Dissolved Organic Carbon (mg/L)20.9429.0430.4726.8212.7976.988<7.6<6.4<6.2--3.807.6410.458.84--
Inorganic Suspended Solids (mg/L)5412734108<510<4--772538
Volatile Suspended Solids (mg/L)1021231811112919203111--29115725
Total Suspended Solids (mg/L)1525342514143927244114--3618713513
Carlson Trophic State Index (Secchi)*6674767159687074677364--696750575161
Carlson Trophic State Index (Chl a)*7073787474717278747567--767359665562
Carlson Trophic State Index (TP)*6593948974777681778171--7072686564-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/13/20168/1/20169/13/2016

Contact Limnology Laboratory, Iowa State University