| Report Year: 2009 |
| Lake Smith, Kossuth County |
| Summary Data Table |
| Parameter | 6/4/2009 | 7/8/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 2.9 | 2.9 | 2.9 | - | - | 3.1 | 3.3 | 3.3 | 3.1 | 3.1 | 3.0 |
| Thermocline Depth (m) | Nil | 0.9 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.8 | 0.6 | 0.7 | - | - | 0.8 | 1.6 | 2.9 | 1.7 | 1.1 | 0.4 |
| Temperature(oC) | 20.2 | 25.2 | 22.7 | - | - | 23.6 | 22.3 | 20.9 | 21.0 | 23.2 | 24.3 |
| Dissolved Oxygen (mg/L) | 16.5 | 10.0 | 13.2 | - | - | 10.5 | 8.8 | 13.1 | 7.6 | 10.5 | 13.6 |
| Dissolved Oxygen Saturation (%) | 182 | 122 | 151.8 | - | - | 121.6 | 103.2 | 148.7 | 83.1 | 122.8 | 168.6 |
| Specific Conductivity (μS/cm) | 360.0 | 320.0 | 340.0 | - | - | 476.1 | 457.4 | 465.8 | 477.3 | 515.4 | 492.3 |
| Turbidity (NTU) | 8.8 | 8.2 | 8.5 | - | - | 131.0 | 8.4 | 3.5 | 12.1 | 15.2 | 46.8 |
| Chlorophyll a (μg/L) | 35.0 | 53.0 | 44.0 | - | - | 109.9 | 32.0 | 13.8 | 28.0 | 33.1 | 41.4 |
| Total Phosphorus as P (μg/L) | 131 | 218 | 175 | - | - | 136 | 126 | 149 | 267 | 126 | 260 |
| SRP as P (μg/L) | - | 2 | 2 | - | - | 4 | 45 | 72 | 179 | - | - |
| Total Nitrogen as N (mg/L) | 0.35 | 2.54 | 1.45 | - | - | 8.63 | 4.73 | 8.77 | 1.57 | 9.29 | 2.43 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 67 | 16 | 35 | - | - | 99 | 242 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 29.8 | 1.1 | 15.4 | - | - | 13.5 | 17.1 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.38 | 0.12 | 0.20 | - | - | 6.70 | 3.14 | 6.84 | 0.24 | 7.90 | 0.62 |
| TN:TP ratio | 3 | 12 | 7 | - | - | 86 | 56 | 92 | 11 | 89 | 9 |
| pH | 9.3 | 9.3 | 9.3 | - | - | 8.5 | 8.5 | 9.4 | 8.4 | 8.3 | 8.0 |
| Alkalinity as CaCO3 (mg/L) | 153 | 133 | 143 | - | - | 158 | 128 | 110 | 151 | 146 | 145 |
| Silica as Si (mg/L) | - | - | - | - | - | 4.28 | 4.72 | 2.68 | 12.26 | - | - |
| Dissolved Organic Carbon (mg/L) | 10.47 | 8.26 | 9.37 | - | - | 8.68 | 15.14 | 13.35 | 13.91 | - | - |
| Inorganic Suspended Solids (mg/L) | 2 | 3 | 2 | - | - | 3 | 2 | 3 | 4 | 7 | 40 |
| Volatile Suspended Solids (mg/L) | 9 | 20 | 15 | - | - | 8 | 5 | 3 | 4 | 5 | 12 |
| Total Suspended Solids (mg/L) | 11 | 23 | 17 | - | - | 11 | 7 | 6 | 8 | 11 | 52 |
| Carlson Trophic State Index (Secchi)* | 63 | 67 | 65 | - | - | 64 | 53 | 45 | 53 | 59 | 75 |
| Carlson Trophic State Index (Chl a)* | 65 | 70 | 68 | - | - | 77 | 65 | 56 | 63 | 65 | 67 |
| Carlson Trophic State Index (TP)* | 74 | 82 | 79 | - | - | 75 | 74 | 76 | 85 | 74 | 84 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |