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Report Year: 2016
Arbor Lake, Poweshiek County
Summary Data Table
Parameter6/20/20168/8/20169/20/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)4.84.84.64.74.84.94.94.95.05.35.45.45.2-5.65.55.65.65.6
Thermocline Depth (m)2.43.51.0N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.50.60.70.60.50.41.40.40.70.61.30.70.9-1.31.10.61.41.2
Temperature(oC)28.224.623.625.421.321.523.323.522.623.823.526.625.9-22.825.025.422.924.4
Dissolved Oxygen (mg/L)13.511.311.212.08.49.610.58.311.716.38.512.813.0-13.310.99.611.910.0
Dissolved Oxygen Saturation (%)173136132147.193.9108.2124.799.1137.9194.099.6159.3160.5-154.3133.5118.3138.3119.5
Specific Conductivity (μS/cm)530.0370.0460.0453.3403.3446.7470.0553.3496.7406.7506.7465.3606.3-450.5478.7401.5455.8349.7
Turbidity (NTU)14.819.812.215.625.527.413.723.018.313.57.919.7116.9-13.614.644.211.713.0
Chlorophyll a (μg/L)58.147.437.247.659.346.748.044.023.639.518.749.235.1-35.321.188.550.132.1
Total Phosphorus as P (μg/L)106.894.2172.4124.513314996.2164.8119.9149.780.6163120-109137189156-
SRP as P (μg/L)<2.8<2.849.415.28.122.7<1430.418.215.3<917.120.7-18.328.144.2--
TKN (mg/L)1.351.141.131.211.301.251.321.370.982.35---------
Total Dissolved Solids (g/L)0.30.20.30.30.30.30.30.40.3----------
Total Nitrogen as N (mg/L)----------1.22.001.31-1.911.471.412.161.36
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)83.15<0.6179.1087607312358177<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)13-111822<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.10<0.071.2300.710.451<0.0611-0.720.12-0.680.360.280.480.57
TN:TP ratio----------181411-2014817-
pH8.48.88.18.48.08.28.28.58.38.18.38.68.8-8.88.68.88.47.3
Alkalinity as CaCO3 (mg/L)14097143127115115118116150132147130145-1239296132128
Silica as Si (mg/L)--------------6.044.036.40--
Dissolved Organic Carbon (mg/L)28.4226.2934.1829.6320.0844.876<7.6<6.4<6.24.767.01-3.758.768.34--
Inorganic Suspended Solids (mg/L)121210111620711911774-462025
Volatile Suspended Solids (mg/L)12107101111813811<887-661185
Total Suspended Solids (mg/L)24221721273015251721101611-101229910
Carlson Trophic State Index (Secchi)*69686668717355726467566561-5758695557
Carlson Trophic State Index (Chl a)*70686668716869686267596966-6660756965
Carlson Trophic State Index (TP)*71707874757670787376677873-72758077-
*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