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Report Year: 2016
Briggs Woods Lake, Hamilton County
Summary Data Table
Parameter6/6/20167/25/20169/6/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)8.97.37.57.98.28.48.78.28.99.18.6--9.09.09.28.68.79.1
Thermocline Depth (m)3.04.03.8N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.00.80.40.70.70.92.41.01.91.52.7--3.41.21.52.51.71.8
Temperature(oC)22.126.722.823.924.723.224.425.124.424.225.7--25.521.820.724.422.725.4
Dissolved Oxygen (mg/L)10.412.38.410.411.910.78.911.49.411.09.2--14.217.014.611.015.510.8
Dissolved Oxygen Saturation (%)11915398123.4142.9124.2105.1136.4112.6130.6113.6--174.2193.2164.0133.6180.5131.4
Specific Conductivity (μS/cm)390.0340.0300.0343.3306.7256.7326.7290.0290.0296.7320.0--600.3538.4541.0645.6514.4393.1
Turbidity (NTU)2.75.020.39.319.513.92.76.35.09.37.4--8.59.613.23.49.15.7
Chlorophyll a (μg/L)13.829.2103.848.9105.338.514.629.927.422.115.7--37.563.123.620.16.414.0
Total Phosphorus as P (μg/L)31.137.695.554.7737954.938.762.867.445.5--428212232170-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.616.7<10<11<8<9--<1<11.4<1--
TKN (mg/L)1.111.182.021.441.872.341.241.431.761.23---------
Total Dissolved Solids (g/L)0.30.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------1.2--13.6512.6510.9813.3715.153.85
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)40.95<0.6<0.6735160136<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)4-4-3-1124938<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)2.931.96<0.0721.410.1931<0.4<0.5---13.1411.639.2714.1316.122.41
TN:TP ratio----------32--385159219501171-
pH8.48.99.18.89.09.28.89.28.68.88.6--8.38.88.48.58.37.8
Alkalinity as CaCO3 (mg/L)15112011913011998123124126135134--205167121178142143
Silica as Si (mg/L)-------------10.5610.466.718.08--
Dissolved Organic Carbon (mg/L)30.6220.1028.2326.3213.2186.977<7.6<6.4<6.2--5.694.917.727.18--
Inorganic Suspended Solids (mg/L)4344103<3.2<2<5<44--217133
Volatile Suspended Solids (mg/L)361485849<8<9<8--657243
Total Suspended Solids (mg/L)7918111611511786--9714466
Carlson Trophic State Index (Secchi)*6063746565624760515446--425855475252
Carlson Trophic State Index (Chl a)*5664766976665764636158--667162604956
Carlson Trophic State Index (TP)*5456706266676257646559--5868735478-
*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