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Report Year: 2016
Browns Lake, Woodbury County
Summary Data Table
Parameter5/17/20166/28/20168/17/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)2.72.12.42.42.32.52.42.52.62.62.6-2.72.92.82.62.72.82.7
Thermocline Depth (m)NilNilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.50.40.50.40.30.60.40.50.50.5-0.70.81.00.90.60.60.4
Temperature(oC)15.028.126.623.219.323.223.223.521.923.925.1-20.725.324.924.624.225.727.1
Dissolved Oxygen (mg/L)12.210.911.511.510.67.49.78.09.98.812.1-10.69.17.710.09.86.27.5
Dissolved Oxygen Saturation (%)121139143134.2115.785.2114.393.6112.7102.6145.5-118.1110.390.6120.5115.970.394.2
Specific Conductivity (μS/cm)450.0500.0570.0506.7700.0626.7766.7750.0606.7566.7663.3-633.1733.6666.9738.8745.9689.4969.7
Turbidity (NTU)29.2-22.625.925.322.715.126.224.920.925.0-9.212.110.621.727.237.931.8
Chlorophyll a (μg/L)27.137.495.553.335.635.825.554.634.937.823.3-4.062.39.017.126.114.241.5
Total Phosphorus as P (μg/L)126.2140.7187.9151.613615989.597.591.7126.881.6-30104495773102-
SRP as P (μg/L)6.93.5<2.83.9<4.331.5<14<10<11<8<9-1.54.96.83.83.6--
TKN (mg/L)0.981.341.501.271.271.101.061.881.491.43---------
Total Dissolved Solids (g/L)0.30.30.40.30.50.40.50.50.4----------
Total Nitrogen as N (mg/L)----------1.3-1.841.981.011.211.191.391.32
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)261.75267.65<0.617212811862<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)969-22599<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--0.830.750.180.140.230.180.17
TN:TP ratio----------17-622021222315-
pH8.18.78.58.48.48.48.58.48.48.38.4-8.38.48.48.48.58.08.0
Alkalinity as CaCO3 (mg/L)146171144154158158173199191159182-163180153136163137180
Silica as Si (mg/L)-------------5.742.453.123.50--
Dissolved Organic Carbon (mg/L)32.3333.9135.2333.8218.8966.559<7.677-5.918.426.9810.0910.14--
Inorganic Suspended Solids (mg/L)76181121191124191112-911513141729
Volatile Suspended Solids (mg/L)89181210118148109-38457912
Total Suspended Solids (mg/L)816352031291939272121-1219917212641
Carlson Trophic State Index (Secchi)*6672726974766874697069-65646061676773
Carlson Trophic State Index (Chl a)*6366757066666270656662-44715258635767
Carlson Trophic State Index (TP)*7475807775776970697468-537160636671-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/17/20166/28/20168/17/2016

Contact Limnology Laboratory, Iowa State University