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Report Year: 2016
Green Castle Lake, Marshall County
Summary Data Table
Parameter6/20/20168/8/20169/20/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.36.76.66.56.6--6.56.36.87.07.17.17.17.47.37.47.36.1
Thermocline Depth (m)2.43.24.4N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.11.12.01.71.8--0.60.70.71.02.63.43.03.63.63.11.81.3
Temperature(oC)27.825.721.324.922.8--22.523.023.923.126.524.424.222.224.325.923.325.8
Dissolved Oxygen (mg/L)7.78.67.37.97.2--7.89.49.79.110.18.09.79.48.76.310.39.8
Dissolved Oxygen Saturation (%)981058395.483.4--89.8111.0115.7106.3125.395.6115.0107.2103.280.0121.6120.8
Specific Conductivity (μS/cm)380.0350.0400.0376.7386.7--366.7336.7356.7383.3290.1314.2310.8294.1337.4374.8353.6304.4
Turbidity (NTU)1.52.52.22.05.2--11.717.98.14.92.52.6136.410.23.09.84.310.9
Chlorophyll a (μg/L)4.214.515.811.550.9--21.931.626.410.06.01.613.822.04.54.66.712.0
Total Phosphorus as P (μg/L)34.342.038.938.453--41.348.747.342.287193824342564-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3--<10<11<8<9<1<1<11.73.6<1--
TKN (mg/L)0.650.620.530.600.96--0.971.772.87---------
Total Dissolved Solids (g/L)0.20.20.30.20.3--0.20.2----------
Total Nitrogen as N (mg/L)----------1.51.250.671.001.501.150.602.010.97
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.6<26--104157<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)0-10-10--<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.12--<0.0611-0.770.180.310.670.500.141.080.15
TN:TP ratio----------3634342861372445-
pH8.48.58.28.48.2--8.28.58.08.49.18.98.79.08.58.48.28.0
Alkalinity as CaCO3 (mg/L)158155167160170--14613114416312012513610695137150176
Silica as Si (mg/L)-------------1.791.151.161.01--
Dissolved Organic Carbon (mg/L)30.9737.6340.4936.3630.96--6<7.6<6.4<6.23.764.393.00<1.249.199.59--
Inorganic Suspended Solids (mg/L)1<0.8<0.8<0.8<1.4--67<4713112242
Volatile Suspended Solids (mg/L)24336--71010<821333332
Total Suspended Solids (mg/L)34446--1317141023545674
Carlson Trophic State Index (Secchi)*5058505251--686565604642444142445257
Carlson Trophic State Index (Chl a)*4557585569--616463534835566145464955
Carlson Trophic State Index (TP)*5558575761--5860605869475650555064-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/20/20168/8/20169/20/2016

Contact Limnology Laboratory, Iowa State University