| Report Year: 2009 |
| Lake Cornelia, Wright County |
| Summary Data Table |
| Parameter | 6/25/2009 | 7/30/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.6 | 5.4 | 5.3 | 5.3 | 5.4 | 4.8 |
| Thermocline Depth (m) | 3.2 | Nil | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.4 | 0.8 | 1.1 | 0.4 | 0.5 | 0.4 | 0.8 | 0.7 | 0.6 | 1.6 | 0.6 |
| Temperature(oC) | 25.6 | 24.0 | 24.8 | 23.8 | 23.2 | 25.7 | 23.2 | 22.7 | 24.6 | 23.8 | 24.9 |
| Dissolved Oxygen (mg/L) | 8.2 | 8.3 | 8.3 | 8.7 | 8.2 | 8.4 | 10.1 | 9.1 | 8.2 | 9.5 | 8.4 |
| Dissolved Oxygen Saturation (%) | 101 | 99 | 99.9 | 102.4 | 95.7 | 103.0 | 118.5 | 105.4 | 100.9 | 112.0 | 101.9 |
| Specific Conductivity (μS/cm) | 400.0 | 440.0 | 420.0 | 359.8 | 379.2 | 380.1 | 381.8 | 369.5 | 525.3 | 406.1 | 419.6 |
| Turbidity (NTU) | 3.4 | 11.1 | 7.3 | 25.4 | 26.9 | 17.2 | 23.3 | 22.7 | 26.3 | 13.1 | 19.0 |
| Chlorophyll a (μg/L) | 11.0 | 18.0 | 14.5 | 24.6 | 26.2 | 53.9 | 32.1 | 28.0 | 26.8 | 27.3 | 14.4 |
| Total Phosphorus as P (μg/L) | 42 | 54 | 48 | 74 | 63 | 72 | 58 | 71 | 62 | 84 | 161 |
| SRP as P (μg/L) | 1 | - | 1 | - | - | - | 2 | 2 | 2 | - | - |
| Total Nitrogen as N (mg/L) | 1.47 | 1.41 | 1.44 | 1.40 | 1.75 | 1.63 | 1.53 | 1.58 | 1.27 | 1.50 | 1.54 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 151 | 16 | 77 | 16 | 16 | 85 | 60 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 19.5 | 0.5 | 10.0 | 1.8 | 0.4 | 14.2 | 8.8 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.26 | 0.12 | 0.17 | 0.25 | 0.12 | 0.18 | 0.40 | 0.26 | 0.24 | 0.30 | 0.19 |
| TN:TP ratio | 35 | 26 | 31 | 22 | 28 | 23 | 27 | 23 | 22 | 26 | 10 |
| pH | 8.4 | 8.6 | 8.5 | 8.5 | 8.4 | 8.5 | 8.6 | 8.5 | 8.5 | 8.2 | 7.6 |
| Alkalinity as CaCO3 (mg/L) | 179 | 175 | 177 | 158 | 164 | 155 | 164 | 114 | 180 | 173 | 186 |
| Silica as Si (mg/L) | - | - | - | - | - | 10.50 | 7.39 | 9.37 | 10.77 | - | - |
| Dissolved Organic Carbon (mg/L) | 8.88 | 9.08 | 8.98 | 10.52 | 10.63 | 11.48 | 9.34 | 13.86 | 13.85 | - | - |
| Inorganic Suspended Solids (mg/L) | 8 | 6 | 7 | 16 | 13 | 12 | 5 | 13 | 8 | 4 | 8 |
| Volatile Suspended Solids (mg/L) | 1 | 9 | 5 | 21 | 20 | 21 | 9 | 16 | 11 | 7 | 10 |
| Total Suspended Solids (mg/L) | 9 | 15 | 12 | 38 | 33 | 33 | 14 | 29 | 14 | 11 | 18 |
| Carlson Trophic State Index (Secchi)* | 56 | 63 | 59 | 74 | 71 | 73 | 64 | 66 | 67 | 53 | 67 |
| Carlson Trophic State Index (Chl a)* | 54 | 59 | 57 | 62 | 63 | 70 | 65 | 63 | 63 | 63 | 57 |
| Carlson Trophic State Index (TP)* | 58 | 62 | 60 | 66 | 64 | 66 | 63 | 66 | 64 | 68 | 77 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |