Normal View    Print View

    

Report Year: 2016
Rock Creek Lake, Jasper County
Summary Data Table
Parameter6/20/20168/8/20169/20/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.44.14.44.34.74.54.44.44.54.84.75.04.95.05.15.04.95.35.1
Thermocline Depth (m)2.7NilNilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.70.60.40.60.70.70.90.60.90.60.70.80.71.00.80.90.71.41.2
Temperature(oC)27.926.122.025.323.122.423.523.722.623.823.225.926.225.322.224.726.723.525.4
Dissolved Oxygen (mg/L)10.05.08.17.710.38.29.68.18.410.78.09.49.910.39.89.88.512.68.0
Dissolved Oxygen Saturation (%)127629293.8120.095.4113.796.595.9126.993.2116.6121.5125.6112.8116.8105.2148.497.5
Specific Conductivity (μS/cm)350.0320.0380.0350.0360.0356.7340.0330.0320.0360.0356.7361.5360.0374.6392.4389.9388.4343.8309.5
Turbidity (NTU)9.411.723.414.811.215.412.718.720.411.115.116.789.829.123.419.217.114.012.6
Chlorophyll a (μg/L)27.523.253.834.849.723.620.157.132.323.132.724.236.087.925.430.326.828.614.8
Total Phosphorus as P (μg/L)76.8151.9156.0128.28987117.8146.285.473.679.2681237175575969-
SRP as P (μg/L)<2.853.833.628.718.421.555.462.811.9<8<911.934.415.915.51.7<1--
TKN (mg/L)1.001.080.590.891.241.081.321.480.522.05---------
Total Dissolved Solids (g/L)0.20.20.20.20.20.20.20.20.2----------
Total Nitrogen as N (mg/L)----------2.44.703.334.005.784.423.346.892.23
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)10.40188.10<0.65856299187265<145179<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)218-2642114<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)1.920.101.0512.061.764<0.0622-3.822.142.914.683.372.576.080.62
TN:TP ratio----------3570528484926399-
pH8.58.28.38.38.38.28.38.48.67.98.48.58.68.38.68.48.38.47.8
Alkalinity as CaCO3 (mg/L)144133162146151146126146135160155149144151144110143140141
Silica as Si (mg/L)-------------5.275.612.963.17--
Dissolved Organic Carbon (mg/L)26.9131.6937.8832.1625.3443.955<7.6<6.4<6.23.603.682.983.186.499.27--
Inorganic Suspended Solids (mg/L)109131161151510912977139954
Volatile Suspended Solids (mg/L)749785698<9<897467844
Total Suspended Solids (mg/L)161322171416112418151818151218161698
Carlson Trophic State Index (Secchi)*65687268646661696268656465606362655657
Carlson Trophic State Index (Chl a)*63617065696260706561656266756264636357
Carlson Trophic State Index (TP)*677777746968737668666765746666636365-
*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