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Report Year: 2016
Arrowhead Pond (Pottawattamie), Pottawattamie County
Summary Data Table
Parameter6/15/20168/2/20169/11/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)3.83.93.73.83.83.83.83.83.84.04.1--4.04.14.04.04.34.0
Thermocline Depth (m)2.72.5NilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)1.50.50.70.90.71.51.00.60.80.60.6--0.50.40.70.91.20.9
Temperature(oC)26.525.620.524.223.121.923.124.724.723.123.6--24.321.424.326.323.125.1
Dissolved Oxygen (mg/L)11.011.25.99.410.011.69.511.212.58.611.1--6.49.312.310.510.010.9
Dissolved Oxygen Saturation (%)13713766113.4117.0133.2110.1136.9153.0101.4132.2--76.3106.7143.4128.7117.6132.8
Specific Conductivity (μS/cm)490.0470.0480.0480.0456.7453.3466.7450.0446.7476.7443.3--442.6377.1383.5357.8411.7437.3
Turbidity (NTU)8.719.315.114.415.98.08.913.319.314.214.4--35.1103.522.842.526.727.1
Chlorophyll a (μg/L)21.781.063.655.461.933.035.461.063.727.646.7--101.456.618.2137.876.626.3
Total Phosphorus as P (μg/L)61.5117.7111.997.01148385.7142.887.2117.3113.6--170257165194179-
SRP as P (μg/L)3.4<2.8<2.8<2.815.320.4<14<10<1133.811.5--28.4117.47.724.5--
TKN (mg/L)0.932.531.691.721.771.731.621.77<0.50.70---------
Total Dissolved Solids (g/L)0.30.30.30.30.30.30.30.30.3----------
Total Nitrogen as N (mg/L)----------2.2--2.052.791.572.082.011.36
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)198.45147.95152.5016611812638378<145212<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)15148128715<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)5.981.110.1121.682.3410<0.42---0.491.340.120.150.790.12
TN:TP ratio----------22--1315101113-
pH8.18.28.18.28.28.28.18.18.47.98.2--8.28.48.98.98.28.4
Alkalinity as CaCO3 (mg/L)205202211206198194201204206213199--185162123168189209
Silica as Si (mg/L)-------------6.0511.515.446.06--
Dissolved Organic Carbon (mg/L)36.4747.8054.6246.3033.5354.345<7.6<6.4<6.2--4.934.9411.1511.32--
Inorganic Suspended Solids (mg/L)212212249<568--43341467
Volatile Suspended Solids (mg/L)415795771210<910--131792069
Total Suspended Solids (mg/L)6169101791121141218--175013211216
Carlson Trophic State Index (Secchi)*5469656166556068646767--697364625862
Carlson Trophic State Index (Chl a)*6174717071656671716368--767059797363
Carlson Trophic State Index (TP)*6473727072686876697372--7884788079-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/15/20168/2/20169/11/2016

Contact Limnology Laboratory, Iowa State University